[Bug target/93274] target_clones produces symbols with random digits with -fPIC

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* [Bug target/93274] target_clones produces symbols with random digits with -fPIC
       [not found] <bug-93274-4@http.gcc.gnu.org/bugzilla/>
@ 2020-01-16  9:14 ` marxin at gcc dot gnu.org
  2020-03-25 10:04 ` cvs-commit at gcc dot gnu.org
  1 sibling, 0 replies; 2+ messages in thread
From: marxin at gcc dot gnu.org @ 2020-01-16  9:14 UTC (permalink / raw)
  To: gcc-bugs

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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93274

Martin LiÅ¡ka <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |marxin at gcc dot gnu.org

--- Comment #5 from Martin LiÅ¡ka <marxin at gcc dot gnu.org> ---
(In reply to Alexander Monakov from comment #4)
> IFUNCs don't have to be somehow "globally visible". The comment is there
> from day 1, but it's not clear why - possibly a misunderstanding? GCC
> happily accepts a static ifunc, and rest of toolchain should have no problem
> either:
> 
> __attribute__((used,ifunc("r_f")))
> static void f();
> 
> static void *r_f()
> {
>  return 0;
> }
>         .type   r_f, @function
> r_f:
>         xorl    %eax, %eax
>         ret
>         .size   r_f, .-r_f
>         .type   f, @gnu_indirect_function
>         .set    f,r_f

Great Alexander. Then let me to test the suggested change.
>From gcc-bugs-return-665740-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 16 09:42:25 2020
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/93285] New: [10 Regression] ICE in cp_gimplify_expr, at cp/cp-gimplify.c:931 since g:08f594eb399dab06
Date: Thu, 16 Jan 2020 09:42:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93285

            Bug ID: 93285
           Summary: [10 Regression] ICE in cp_gimplify_expr, at
                    cp/cp-gimplify.c:931 since g:08f594eb399dab06
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: jason at gcc dot gnu.org
  Target Milestone: ---

I see the following ICE:

$ cat cpu.ii
struct A {
  using btype = bool;
  template <typename T> A(T);
  btype data;
};
using boolean = A;
struct B {
  auto m_fn1() -> void;
  struct {
    boolean nmiValid = 0;
  } status;
};
auto B::m_fn1() -> void { status = {}; }

$ g++ -fmax-errors=1 -std=c++17 cpu.ii -c
cpu.ii: In member function â€˜void B::m_fn1()â€™:
cpu.ii:13:34: internal compiler error: in cp_gimplify_expr, at
cp/cp-gimplify.c:933
   13 | auto B::m_fn1() -> void { status = {}; }
      |                           ~~~~~~~^~~~
0xa4038b cp_gimplify_expr(tree_node**, gimple**, gimple**)
        /home/marxin/Programming/gcc/gcc/cp/cp-gimplify.c:933
0x113932b gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        /home/marxin/Programming/gcc/gcc/gimplify.c:13490
0x110f081 gimplify_init_ctor_preeval
        /home/marxin/Programming/gcc/gcc/gimplify.c:4510
0x110f04f gimplify_init_ctor_preeval
        /home/marxin/Programming/gcc/gcc/gimplify.c:4496
0x1110a3f gimplify_init_constructor
        /home/marxin/Programming/gcc/gcc/gimplify.c:5082
0x1111681 gimplify_modify_expr_rhs
        /home/marxin/Programming/gcc/gcc/gimplify.c:5369
0x11127cb gimplify_modify_expr
        /home/marxin/Programming/gcc/gcc/gimplify.c:5720
0x11396d8 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        /home/marxin/Programming/gcc/gcc/gimplify.c:13581
0x1116cc1 gimplify_stmt(tree_node**, gimple**)
        /home/marxin/Programming/gcc/gcc/gimplify.c:6822
0x11161f5 gimplify_cleanup_point_expr
        /home/marxin/Programming/gcc/gcc/gimplify.c:6564
0x113b165 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        /home/marxin/Programming/gcc/gcc/gimplify.c:13973
0x1116cc1 gimplify_stmt(tree_node**, gimple**)
        /home/marxin/Programming/gcc/gcc/gimplify.c:6822
0x113e105 gimplify_body(tree_node*, bool)
        /home/marxin/Programming/gcc/gcc/gimplify.c:14830
0x113e8f6 gimplify_function_tree(tree_node*)
        /home/marxin/Programming/gcc/gcc/gimplify.c:14974
0xec24e7 cgraph_node::analyze()
        /home/marxin/Programming/gcc/gcc/cgraphunit.c:669
0xec43fc analyze_functions
        /home/marxin/Programming/gcc/gcc/cgraphunit.c:1210
0xec961d symbol_table::finalize_compilation_unit()
        /home/marxin/Programming/gcc/gcc/cgraphunit.c:2956
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/93285] [10 Regression] ICE in cp_gimplify_expr, at cp/cp-gimplify.c:931 since g:08f594eb399dab06
Date: Thu, 16 Jan 2020 09:42:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93285

Martin LiÅ¡ka <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P1
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2020-01-16
      Known to work|                            |9.2.0
   Target Milestone|---                         |10.0
     Ever confirmed|0                           |1
      Known to fail|                            |10.0
>From gcc-bugs-return-665742-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 16 09:43:26 2020
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From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/93263] [9/10 Regression] -fno-automatic and RECURSIVE
Date: Thu, 16 Jan 2020 09:43:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93263

--- Comment #5 from Tobias Burnus <burnus at gcc dot gnu.org> ---
(In reply to markeggleston from comment #4)
> -  if (ns->save_all || !flag_automatic)
> +  if (!recursive && (ns->save_all || !flag_automatic))

> Does the trick. Now need to write the test cases and prepare a patch.

I wonder whether it should be rather:
  if (ns->save_all || (!flag_automatic && !recursive))

I think your patch would break for the following code. And I believe it is
standard conform Fortran 90/2018:

  integer :: cnt
  cnt = 0
  call sub()
  if (cnt /= 5) stop 1
contains
  recursive subroutine sub()
    save
    logical :: first = .true.
    integer :: i
    cnt = cnt + 1
    if (first) then
      first = .false.
      i = 1
    end if
    print *, "Hello", i
    i = i + 1
    if (i <= 5) call sub()
  end subroutine
end

 * * *

Side remark: The Fortran 2018 introduction states:

"the RECURSIVE keyword is advisory only. The NON_RECURSIVE keyword specifies
that a procedure is not recursive."

Hence, I wonder whether this is correctly implemented in gfortran â€¦
>From gcc-bugs-return-665743-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 16 09:47:10 2020
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From: "markeggleston at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/93263] [9/10 Regression] -fno-automatic and RECURSIVE
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93263

--- Comment #6 from markeggleston at gcc dot gnu.org ---
(In reply to Tobias Burnus from comment #5)
> (In reply to markeggleston from comment #4)
> > -  if (ns->save_all || !flag_automatic)
> > +  if (!recursive && (ns->save_all || !flag_automatic))
> 
> > Does the trick. Now need to write the test cases and prepare a patch.
> 
> I wonder whether it should be rather:
>   if (ns->save_all || (!flag_automatic && !recursive))

That's clearer.

> 
> I think your patch would break for the following code. And I believe it is
> standard conform Fortran 90/2018:

I'll check and reconsider if it does.

> 
>   integer :: cnt
>   cnt = 0
>   call sub()
>   if (cnt /= 5) stop 1
> contains
>   recursive subroutine sub()
>     save
>     logical :: first = .true.
>     integer :: i
>     cnt = cnt + 1
>     if (first) then
>       first = .false.
>       i = 1
>     end if
>     print *, "Hello", i
>     i = i + 1
>     if (i <= 5) call sub()
>   end subroutine
> end
> 
>  * * *
> 
> Side remark: The Fortran 2018 introduction states:
> 
> "the RECURSIVE keyword is advisory only. The NON_RECURSIVE keyword specifies
> that a procedure is not recursive."
> 
> Hence, I wonder whether this is correctly implemented in gfortran â€¦
>From gcc-bugs-return-665744-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 16 09:54:12 2020
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From: "felix.von.s at posteo dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/57612] add builtin to assert that expression does not have side effects
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57612

felix <felix.von.s at posteo dot de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |felix.von.s at posteo dot de

--- Comment #3 from felix <felix.von.s at posteo dot de> ---
Overlaps bug 6906. Under that ticket, I proposed adding a built-in that simply
returns whether or not a given expression has side effects, simply by exposing
TREE_SIDE_EFFECTS(). This more general built-in could also (partially) address
bug 79469, by allowing to define __builtin_assume as 

#define __builtin_assume(cond) do { \
        if (__builtin_pure_p(cond)) \
            if (!(cond)) \
                __builtin_unreachable(); \
    } while (0)

Partially, because e.g. if A has side effects, then with the definition above
__builtin_assume(A && B) would consider the whole condition to have side
effects as well, and therefore disregard it, even if B could potentially be
mined for optimisation opportunities.
>From gcc-bugs-return-665745-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 16 09:59:02 2020
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/87106] Group move and destruction of the source, where possible, for speed
Date: Thu, 16 Jan 2020 09:59:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87106

--- Comment #25 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I think that's the answer, yes (although I haven't refreshed my memory of the
issues completely). A call to memmove does not begin the lifetime of any
objects at the destination address.

For types that are trivially-copyable but not trivial we could consider doing a
first pass over the range to default-initialize the destination objects, then
do the memmove to overwrite them with the desired values. In theory, the
optimizer would realize the default-initializations are dead stores and
completely remove that first loop (but only after the semantic checks have
concluded that we are obeying the languages rules and have no undefined
behaviour).

So change the bitwise_relocatable condition to is_trivially_copyable &&
is_default_constructible and make __relocate_a_1 do something like this
(completely untested, typing as I think about it):

  template<typename _Tp, typename = void>
    struct __is_bitwise_relocatable
    : __and_<is_trivially_copyable<_Tp>, is_default_constructible<_Tp>> { };

  template <typename _Tp, typename _Up>
    inline __enable_if_t<std::__is_bitwise_relocatable<_Tp>::value, _Tp*>
    __relocate_a_1(_Tp* __first, _Tp* __last,
                   _Tp* __result, allocator<_Up>& a) noexcept
    {
      ptrdiff_t __count = __last - __first;
      if (__count > 0)
        {
          if constexpr (!is_trivial_v<T>)
            {
#ifdef __OPTIMIZE__
              // begin lifetime of destination objects
              std::__uninitialized_default_novalue_n(result, result + count);
#else
              // can't do bitwise relocation today
              for (ptrdiff_t i = 0; i < count; ++i)
                __relocate_object_a(result + i, first + i, a);
              return result + count;
#endif         
            }
          __builtin_memmove(__result, __first, __count * sizeof(_Tp));
        }
      return __result + __count;
    }
>From gcc-bugs-return-665746-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 16 10:02:31 2020
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Subject: [Bug libstdc++/87106] Group move and destruction of the source, where possible, for speed
Date: Thu, 16 Jan 2020 10:02:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87106

--- Comment #26 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Or maybe that should be:

  template<typename _Tp, typename = void>
    struct __is_bitwise_relocatable
    : is_trivially_copyable<_Tp> { };

...

          if constexpr (!is_trivial_v<T>)
            if (is_default_constructible_v<_Tp> && (__OPTIMIZE__+0))
              std::__uninitialized_default_novalue_n(result, result + count);
            else
              {
                // can't do bitwise relocation today
                ...
              }
>From gcc-bugs-return-665747-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 16 10:03:59 2020
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87106

--- Comment #27 from Jonathan Wakely <redi at gcc dot gnu.org> ---
>           if constexpr (!is_trivial_v<T>)
>             if (is_default_constructible_v<_Tp> && (__OPTIMIZE__+0))

That would need to be 'if constexpr'

I'll stop now.
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Subject: [Bug fortran/93263] [9/10 Regression] -fno-automatic and RECURSIVE
Date: Thu, 16 Jan 2020 10:09:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93263

Tobias Burnus <burnus at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=91413

--- Comment #7 from Tobias Burnus <burnus at gcc dot gnu.org> ---
(In reply to Tobias Burnus from comment #5)
> Side remark: The Fortran 2018 introduction states:
> 
> "the RECURSIVE keyword is advisory only. The NON_RECURSIVE keyword specifies
> that a procedure is not recursive."

That's a Fortran 2018 change, see also PR 91413 â€¦

I am not quite sure what implications this have for -fno-automatic -frecursive
etc. As those are vendor extensions, it probably just means that one just needs
to update the documentation.
>From gcc-bugs-return-665749-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 16 10:10:31 2020
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92176

--- Comment #10 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Andreas Krebbel <krebbel@gcc.gnu.org>:

https://gcc.gnu.org/g:3b5757ea87ad2274b841340335bf7536204e615b

commit r10-5996-g3b5757ea87ad2274b841340335bf7536204e615b
Author: Andreas Krebbel <krebbel@linux.ibm.com>
Date:   Thu Jan 16 10:41:44 2020 +0100

    Work around array out of bounds warning in mkdeps

    This suppresses an array out of bounds warning in mkdeps.c as proposed
    by Martin Sebor in the bugzilla.

    array subscript 2 is outside array bounds of â€˜const char [2]â€™

    Since this warning does occur during bootstrap it currently breaks
    werror builds on IBM Z.

    The problem can be reproduced also on x86_64 by changing the inlining
    threshold using: --param max-inline-insns-auto=80

    Bootstrapped and regression tested on x86_64 and IBM Z.

    libcpp/ChangeLog:

    2020-01-16  Andreas Krebbel  <krebbel@linux.ibm.com>

        PR tree-optimization/92176
        * mkdeps.c (deps_add_default_target): Avoid calling apply_vpath to
        suppress an array out of bounds warning.
>From gcc-bugs-return-665750-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 16 10:14:48 2020
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93286

            Bug ID: 93286
           Summary: [10 Regression] ICE: tree check: did not expect class
                    â€˜typeâ€™, have â€˜typeâ€™ (reference_type) in
                    convert_from_reference, at cp/cvt.c:550 since
                    g:e0d91792eec490d1
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: edlinger at gcc dot gnu.org
  Target Milestone: ---

I see the following ICE:

$ cat effect.ii
template <bool> using __bool_constant = struct A;
template <typename... _Args>
struct B : __bool_constant<__is_constructible(int, _Args...)> {};
template <bool> using enable_if_t = int;
template <typename... _Args> bool is_constructible_v = B<_Args...>::value;
class C {
  template <typename _Tp, typename = enable_if_t<is_constructible_v<_Tp>>>
  C(_Tp &&);
};
using Effect_t = C;
void fn1(Effect_t effect) {
  [](int &effect) {};
}

$ g++ -fmax-errors=1 -std=c++17 effect.ii -c
effect.ii: In instantiation of â€˜struct B<int&&>â€™:
effect.ii:5:35:   required from â€˜bool is_constructible_v<int&&>â€™
effect.ii:7:50:   required by substitution of â€˜template<class _Tp, class>
C::C(_Tp&&) [with _Tp = int&&; <template-parameter-1-2> = <missing>]â€™
effect.ii:12:17:   required from here
effect.ii:3:28: internal compiler error: tree check: did not expect class
â€˜typeâ€™, have â€˜typeâ€™ (reference_type) in convert_from_reference, at cp/cvt.c:550
    3 | struct B : __bool_constant<__is_constructible(int, _Args...)> {};
      |                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
0x18ae642 tree_not_class_check_failed(tree_node const*, tree_code_class, char
const*, int, char const*)
        /home/marxin/Programming/gcc/gcc/tree.c:9784
0x9cbb02 non_type_check(tree_node*, char const*, int, char const*)
        /home/marxin/Programming/gcc/gcc/tree.h:3457
0xa5747b convert_from_reference(tree_node*)
        /home/marxin/Programming/gcc/gcc/cp/cvt.c:550
0xc59671 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
        /home/marxin/Programming/gcc/gcc/cp/pt.c:19865
0xc5b1cd tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
        /home/marxin/Programming/gcc/gcc/cp/pt.c:20164
0xc53012 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
        /home/marxin/Programming/gcc/gcc/cp/pt.c:18515
0xc2f384 tsubst_template_arg(tree_node*, tree_node*, int, tree_node*)
        /home/marxin/Programming/gcc/gcc/cp/pt.c:12069
0xc3306e tsubst_template_args(tree_node*, tree_node*, int, tree_node*)
        /home/marxin/Programming/gcc/gcc/cp/pt.c:13136
0xc4125f tsubst(tree_node*, tree_node*, int, tree_node*)
        /home/marxin/Programming/gcc/gcc/cp/pt.c:15388
0xc3f305 tsubst(tree_node*, tree_node*, int, tree_node*)
        /home/marxin/Programming/gcc/gcc/cp/pt.c:14988
0xc2d32c instantiate_class_template_1
        /home/marxin/Programming/gcc/gcc/cp/pt.c:11639
0xc2f2da instantiate_class_template(tree_node*)
        /home/marxin/Programming/gcc/gcc/cp/pt.c:12051
0xcf9f6b complete_type(tree_node*)
        /home/marxin/Programming/gcc/gcc/cp/typeck.c:137
0xc9717f lookup_member(tree_node*, tree_node*, int, bool, int,
access_failure_info*)
        /home/marxin/Programming/gcc/gcc/cp/search.c:1129
0xb7b010 lookup_qualified_name(tree_node*, tree_node*, int, bool, bool)
        /home/marxin/Programming/gcc/gcc/cp/name-lookup.c:6009
0xc435cb tsubst_qualified_id
        /home/marxin/Programming/gcc/gcc/cp/pt.c:15980
0xc55c14 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
        /home/marxin/Programming/gcc/gcc/cp/pt.c:19184
0xc53012 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
        /home/marxin/Programming/gcc/gcc/cp/pt.c:18515
0xc43a3e tsubst_init
        /home/marxin/Programming/gcc/gcc/cp/pt.c:16067
0xc6de81 regenerate_decl_from_template
        /home/marxin/Programming/gcc/gcc/cp/pt.c:24819
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
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Martin LiÅ¡ka <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P1
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2020-01-16
      Known to work|                            |9.2.0
   Target Milestone|---                         |10.0
     Ever confirmed|0                           |1
      Known to fail|                            |10.0
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Subject: [Bug fortran/91413] [F2018]: Procedures are recursive by default; switching from stack to static allocation is not safe
Date: Thu, 16 Jan 2020 10:19:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91413

Tobias Burnus <burnus at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |burnus at gcc dot gnu.org

--- Comment #6 from Tobias Burnus <burnus at gcc dot gnu.org> ---
Currently, direct recursive use is still not permitted:

Error: Function â€˜facultyâ€™ at (1) cannot be called recursively, as it is not
RECURSIVE

This has to be turned into "Error: Fortran 2018: ... without RECURSIVE".

We also have to think about how to handle the -f(no-)automatic -frecursive etc.
with this change. â€“ As "SAVE" is also allowed in recursive functions, we just
need to ensure that the old semantic stays the same and write a few more words
to the documentation.

Regarding -fmax-stack-var-size=n and -fstack-arrays, one also needs to should
point out the implications regarding recursive use, possibly the effect of an
explicit RECURSIVE and Fortran >= 2018.

Regarding the stack to static handling: I think we currently also print the
message if the user has explicitly given "NON_RECURSIVE" as the flag is
currently binary (recursive - true/false) but it should keep track of
(nonspecified, recursive, non_recursive).
>From gcc-bugs-return-665753-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 16 10:20:55 2020
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Subject: [Bug fortran/93263] [9/10 Regression] -fno-automatic and RECURSIVE
Date: Thu, 16 Jan 2020 10:20:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93263

--- Comment #8 from markeggleston at gcc dot gnu.org ---
The change to:

if (ns->save_all || (!flag_automatic && !recursive))

Now allows the second example program to produce:

 Hello           1
 Hello           2
 Hello           3
 Hello           4
 Hello           5

instead of:

 Hello           1
 Hello       32766
STOP 1

I'll add the second program as a test case.
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Subject: [Bug tree-optimization/92429] [10 Regression] ICE in vect_transform_stmt, at tree-vect-stmts.c:10918
Date: Thu, 16 Jan 2020 10:30:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92429

--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Andre Simoes Dias Vieira
<avieira@gcc.gnu.org>:

https://gcc.gnu.org/g:f7dff7699fd70d3b8c3e637818e18c86f93ccfec

commit r10-5997-gf7dff7699fd70d3b8c3e637818e18c86f93ccfec
Author: Andre Vieira <andre.simoesdiasvieira@arm.com>
Date:   Thu Jan 16 10:28:02 2020 +0000

    PR tree-optimization/92429 do not fold when updating epilogue statements

    This patch addresses the problem reported in PR92429.  When creating an
    epilogue for vectorization we have to replace the SSA_NAMEs in the
    PATTERN_DEF_SEQs and RELATED_STMTs of the epilogue's loop_vec_infos. When
doing
    this we were using simplify_replace_tree which always folds the
replacement.
    This may lead to a different tree-node than the one which was analyzed in
    vect_loop_analyze.  In turn the new tree-node may require a different
    vectorization than the one we had prepared for which caused the ICE in
    question.

    gcc/ChangeLog:
    2020-01-16  Andre Vieira  <andre.simoesdiasvieira@arm.com>

        PR tree-optimization/92429
        * tree-ssa-loop-niter.h (simplify_replace_tree): Add parameter.
        * tree-ssa-loop-niter.c (simplify_replace_tree): Add parameter to
        control folding.
        * tree-vect-loop.c (update_epilogue_vinfo): Do not fold when replacing
        tree.

    gcc/testsuite/ChangeLog:
    2020-01-16  Andre Vieira  <andre.simoesdiasvieira@arm.com>

        PR tree-optimization/92429
        * gcc.dg/vect/pr92429.c: New test.
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Subject: [Bug fortran/93263] [9/10 Regression] -fno-automatic and RECURSIVE
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93263

--- Comment #9 from markeggleston at gcc dot gnu.org ---
(In reply to Tobias Burnus from comment #7)
> (In reply to Tobias Burnus from comment #5)
> > Side remark: The Fortran 2018 introduction states:
> > 
> > "the RECURSIVE keyword is advisory only. The NON_RECURSIVE keyword specifies
> > that a procedure is not recursive."
> 
> That's a Fortran 2018 change, see also PR 91413 â€¦
> 
> I am not quite sure what implications this have for -fno-automatic
> -frecursive etc. As those are vendor extensions, it probably just means that
> one just needs to update the documentation.

So for Fortran 2018 the default for a procedure should be recursive and prior
to Fortran 2018 it should should not.

The default standard is GNU which includes everything up Fortran 2018 plus
extensions. When this is used I expect that no thought has been made regarding
the standard so simply implementing the above would break existing programs.

Should this issue be postponed to the stage 1?
>From gcc-bugs-return-665756-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 16 10:41:38 2020
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Subject: [Bug target/40838] gcc shouldn't assume that the stack is aligned
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=40838

--- Comment #96 from Viktor Ostashevskyi <ostash at ostash dot kiev.ua> ---
Honestly, I don't see how your compiler flags could help. cost-model=cheap
is default, data-alignment doesn't change incoming stack alignment.

ÑÑ€, 15 ÑÑ–Ñ‡. 2020, 14:31 ÐºÐ¾Ñ€Ð¸ÑÑ‚ÑƒÐ²Ð°Ñ‡ mahatma at eu dot by <
gcc-bugzilla@gcc.gnu.org> Ð¿Ð¸ÑˆÐµ:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=40838
>
> --- Comment #95 from Dzianis Kahanovich <mahatma at eu dot by> ---
> Just FYI. Novadays, on my Thinkpad tablet with Atom (32 bit userspace
> Gentoo),
> I globally replace patch/-mstackrealign to "-fvect-cost-model=cheap
> -fsimd-cost-model=cheap -malign-data=cacheline" and all works fine for -O3
> +.
> (This is dirty example, as cacheline for some old SSE CPUs are different,
> etc).
>
> --
> You are receiving this mail because:
> You are on the CC list for the bug.
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Subject: [Bug fortran/93263] [9/10 Regression] -fno-automatic and RECURSIVE
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--- Comment #10 from markeggleston at gcc dot gnu.org ---
This is relevant:

https://gcc.gnu.org/ml/fortran/2017-12/msg00082.html

since the non_recursive keyword is not yet recognised by gfortran, I think it
SHOULD be postponed.
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Matthias Klose <doko at debian dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |INVALID

--- Comment #2 from Matthias Klose <doko at debian dot org> ---
my bad, pebcak.
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Subject: [Bug rtl-optimization/92176] LRA problem with reloads for subreg operands
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--- Comment #11 from Andreas Krebbel <krebbel at gcc dot gnu.org> ---
(In reply to CVS Commits from comment #10)
> The master branch has been updated by Andreas Krebbel <krebbel@gcc.gnu.org>:
> 
> https://gcc.gnu.org/g:3b5757ea87ad2274b841340335bf7536204e615b
> 
> commit r10-5996-g3b5757ea87ad2274b841340335bf7536204e615b
> Author: Andreas Krebbel <krebbel@linux.ibm.com>
> Date:   Thu Jan 16 10:41:44 2020 +0100
> 
>     Work around array out of bounds warning in mkdeps
>     
>     This suppresses an array out of bounds warning in mkdeps.c as proposed
>     by Martin Sebor in the bugzilla.
>     
>     array subscript 2 is outside array bounds of â€˜const char [2]â€™
>     
>     Since this warning does occur during bootstrap it currently breaks
>     werror builds on IBM Z.
>     
>     The problem can be reproduced also on x86_64 by changing the inlining
>     threshold using: --param max-inline-insns-auto=80
>     
>     Bootstrapped and regression tested on x86_64 and IBM Z.
>     
>     libcpp/ChangeLog:
>     
>     2020-01-16  Andreas Krebbel  <krebbel@linux.ibm.com>
>     
>     	PR tree-optimization/92176
>     	* mkdeps.c (deps_add_default_target): Avoid calling apply_vpath to
>     	suppress an array out of bounds warning.

PR number was wrong in the commit - sorry.
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Subject: [Bug c/93287] New: _Static_assert creates spurious -Wdeclaration-after-statement warnings
Date: Thu, 16 Jan 2020 12:31:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93287

            Bug ID: 93287
           Summary: _Static_assert creates spurious
                    -Wdeclaration-after-statement warnings
           Product: gcc
           Version: 9.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: markus at oberhumer dot com
  Target Milestone: ---

gcc 9 under Fedora 31: gcc version 9.2.1 20190827 (Red Hat 9.2.1-1) (GCC)

The small program below creates spurious warnings:

$ gcc -Wdeclaration-after-statement test.c

test.c: In function â€˜mainâ€™:
test.c:4:5: warning: ISO C90 forbids mixed declarations and code
[-Wdeclaration-after-statement]
    4 |     _Static_assert(1 == 1, "error");
      |     ^~~~~~~~~~~~~~


$ cat test.c

int main() {
    int r;
    r = 0;
    _Static_assert(1 == 1, "error");
    return r;
}
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93287

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
_Static_assert is considered a declaration IIRC.
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Subject: [Bug c/93287] _Static_assert creates spurious -Wdeclaration-after-statement warnings
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93287

--- Comment #2 from Markus F.X.J. Oberhumer <markus at oberhumer dot com> ---
This is somewhat unexpected, and I do not get any warnings when using clang:

$ clang-9 -Wdeclaration-after-statement test.c
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Subject: [Bug c/93287] _Static_assert creates spurious -Wdeclaration-after-statement warnings
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--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Markus F.X.J. Oberhumer from comment #2)
> This is somewhat unexpected, and I do not get any warnings when using clang:
> 
> $ clang-9 -Wdeclaration-after-statement test.c

But clang might be wrong ...
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Subject: [Bug c/93278] huge almost empty array takes huge time to compile and produces huge object file
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:

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----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Can't reproduce with current trunk (7.x is unsupported, but can't reproduce
with that either):
char a[HUGE] = "x";
./cc1 -fmem-report -O2 -DHUGE=10000000000 pr93278.c
...
 TOTAL                              :   0.01          0.00          0.01       
   1383 kB
Assembly is then:
        .type   a, @object
        .size   a, 10000000000
a:
        .string "x"
        .zero   9999999998
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Subject: [Bug lto/93166] [10 Regression] ICE in get_info_about_necessary_edges, at ipa-cp.c:4137 since r278893
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--- Comment #3 from fxue at gcc dot gnu.org ---
(In reply to Martin Jambor from comment #2)
> I have analyzed this ICE and came to the conclusion that the assert is
> wrong for polymorphic context lattices - e.g. in the reported case we
> always pass the same class to first parameter, which in the recursive
> call then serves as a basis to ancestor JF for the second parameter.
> 
> When propagating polymorphic contexts within SCCs we allow creating
> new values because for any sane input their number will be limited by
> class hierarchy (and potential insane input limited by
> param_ipa_cp_value_list_size).  I think that is OK too.
> 
> So we can either simply remove the assert or make it active only for
> tree lattices.  At the moment I'd prefer the former, but Feng, if this
> assert proved valuable in development the recursive function
> versioning patch, I'll be happy to keep it.  What do you think?

Sorry for late response due to trip. I'll check it.
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Subject: [Bug c/93287] _Static_assert creates spurious -Wdeclaration-after-statement warnings
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:

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--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
_Static_assert is a declaration in the C standard to allow it to be at the
toplevel too.

Also this fails as expected (on both GCC and Clang):
int f(void)
{
  if (1)
    _Static_assert (1);
}

---- CUT ----
so yes _Static_assert is a declaration.

I would say it is a bug in clang rather than gcc here.
clang documentation is really really lacking here too:
https://clang.llvm.org/docs/DiagnosticsReference.html#wdeclaration-after-statement

:)

GCC is much better:
https://gcc.gnu.org/onlinedocs/gcc-9.2.0/gcc/Warning-Options.html#index-Wdeclaration-after-statement
-Wdeclaration-after-statement (C and Objective-C only)
Warn when a declaration is found after a statement in a block. This construct,
known from C++, was introduced with ISO C99 and is by default allowed in GCC.
It is not supported by ISO C90. See Mixed Declarations[1].

[1]
https://gcc.gnu.org/onlinedocs/gcc-9.2.0/gcc/Mixed-Declarations.html#Mixed-Declarations
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avieira at gcc dot gnu.org changed:

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--- Comment #7 from avieira at gcc dot gnu.org ---
I believe this is fixed, closing.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93287

--- Comment #5 from Markus F.X.J. Oberhumer <markus at oberhumer dot com> ---
I see, many thanks for the clarification.

Still this is not nice from a usability perspective - why did the standard make
this a declaration instead of a statement?

Well, will revert back to using homegrown COMPILE_TIME_ASSERT macros...
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Subject: [Bug analyzer/93288] New: ICE in supergraph.cc:180
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93288

            Bug ID: 93288
           Summary: ICE in supergraph.cc:180
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: analyzer
          Assignee: dmalcolm at gcc dot gnu.org
          Reporter: pmatos at gcc dot gnu.org
  Target Milestone: ---

Great work with the analyzer! :)

I am running it on WebKit and I find a few issues. At the moment they all seem
to point to supergraph.cc:180. Here's a reduced example with todays
(16.01.2020) GCC:

$ /home/pmatos/installs/gcc-20200116/bin/g++ -v       
Using built-in specs.
COLLECT_GCC=/home/pmatos/installs/gcc-20200116/bin/g++
COLLECT_LTO_WRAPPER=/home/pmatos/installs/gcc-20200116/libexec/gcc/x86_64-pc-linux-gnu/10.0.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc/configure --prefix=/home/pmatos/installs/gcc-20200116
--enable-languages=c,c++,lto --disable-docs --disable-multilib --disable-nls
--disable-bootstrap
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 10.0.1 20200116 (experimental) (GCC)

Test case:

struct a {
  a();
};
class {
  a b;
} c;

$ /home/pmatos/installs/gcc-20200116/bin/g++ -std=gnu++17 -fanalyzer -c
AllIsoHeaps.ii
during IPA pass: analyzer
AllIsoHeaps.ii:6:4: internal compiler error: Segmentation fault
    6 | } c;
      |    ^
0x105fbdf crash_signal
        ../../gcc/gcc/toplev.c:328
0x140d341 supergraph::supergraph(logger*)
        ../../gcc/gcc/analyzer/supergraph.cc:180
0x13d768f impl_run_checkers(logger*)
        ../../gcc/gcc/analyzer/engine.cc:3520
0x13d8d73 run_checkers()
        ../../gcc/gcc/analyzer/engine.cc:3624
0x13cdb28 execute
        ../../gcc/gcc/analyzer/analyzer-pass.cc:84
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
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--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Markus F.X.J. Oberhumer from comment #5)
> Still this is not nice from a usability perspective - why did the standard
> make this a declaration instead of a statement?

I said why, to allow it to be at the toplevel and not inside a function without
changing the grammar that much.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93286

--- Comment #1 from Bernd Edlinger <edlinger at gcc dot gnu.org> ---
with the following command it started already earlier:

gcc -Wshadow-compatible-local -fmax-errors=1 -std=c++17 -c effect.ii
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Wilco <wilco at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #8 from Wilco <wilco at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug analyzer/93288] ICE in supergraph.cc:180
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93288

--- Comment #1 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Note that C++ is out-of-scope for the analyzer for GCC 10.

Program received signal SIGSEGV, Segmentation fault.
0x0000000001cb37ed in supergraph::supergraph (this=0x7fffffffcda0, logger=0x0)
    at ../../src/gcc/analyzer/supergraph.cc:180
180                 = ENTRY_BLOCK_PTR_FOR_FN (edge->callee->get_fun ());
Missing separate debuginfos, use: dnf debuginfo-install
gmp-6.1.2-10.fc30.x86_64 libmpc-1.1.0-3.fc30.x86_64 libzstd-1.4.2-1.fc30.x86_64
mpfr-3.1.6-4.fc30.x86_64

(gdb) p edge->callee
$1 = <cgraph_node * 0x7fffeaaaa2d0 "__ct_comp "/2>

(gdb) p edge->callee->get_fun()->cfg
$4 = (control_flow_graph *) 0x0

So it's a segfault reading through a NULL cfg pointer.
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:

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                 CC|                            |jakub at gcc dot gnu.org

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Indeed, with those options started to ICE with
r8-742-gb42cc3ca244ea57d5112638a73e7f83c58202a84 when __is_constructible has
been implemented.
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Subject: [Bug fortran/93289] New: array constructor of different length: Missing diagnostic when PARAMETER is in list
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            Bug ID: 93289
           Summary: array constructor of different length: Missing
                    diagnostic when PARAMETER is in list
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Keywords: accepts-invalid, diagnostic
          Severity: normal
          Priority: P3
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  Target Milestone: ---

The following code has different string lengths in the array constructor.
If only string literals are used, an error is printed. But if the first
argument is a PARAMETER, seemingly no checking is done.

character(len=*), parameter ::  str = "abj", str2 = "1234"
print *, ["ab", "hjf333", str] ! Error: Different CHARACTER lengths (2/6) in
array...
print *, ["ab", str2]          ! Error -> OK
print *, [str, "ab", "hjf333"] ! Accepted, why?
print *, [str, str2]           ! Accepted, why?
end
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From: "dmalcolm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug analyzer/93290] New: analyzer ICE on isnan()
Date: Thu, 16 Jan 2020 14:31:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93290

            Bug ID: 93290
           Summary: analyzer ICE on isnan()
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: analyzer
          Assignee: dmalcolm at gcc dot gnu.org
          Reporter: dmalcolm at gcc dot gnu.org
  Target Milestone: ---

As reported on IRC, this code ICEs the analyzer:

#include <math.h>
int main(void) {
    float foo = 42.;
    if (isnan(foo)) {
        return 1;
    } return 0;
}

during IPA pass: analyzer
foo.c: In function 'main':
foo.c:4:8: internal compiler error: in eval_condition_without_cm, at
analyzer/region-model.cc:5197
    4 |     if (isnan(foo)) {
      |        ^
0x632ab1 region_model::eval_condition_without_cm(svalue_id, tree_code,
svalue_id) const
        ../../gcc-2588197/gcc/analyzer/region-model.cc:5197
0xe2e729 region_model::eval_condition(svalue_id, tree_code, svalue_id) const
        ../../gcc-2588197/gcc/analyzer/region-model.cc:5161
0xe2e729 region_model::add_constraint(tree_node*, tree_code, tree_node*,
region_model_context*)
        ../../gcc-2588197/gcc/analyzer/region-model.cc:5270
0xe20492 program_state::on_edge(exploded_graph&, exploded_node const&,
superedge const*, state_change*)
        ../../gcc-2588197/gcc/analyzer/program-state.cc:727
0xe0f549 exploded_node::on_edge(exploded_graph&, superedge const*,
program_point*, program_state*, state_change*) const
        ../../gcc-2588197/gcc/analyzer/engine.cc:1075
0xe16297 exploded_graph::process_node(exploded_node*)
        ../../gcc-2588197/gcc/analyzer/engine.cc:2500
0xe16822 exploded_graph::process_worklist()
        ../../gcc-2588197/gcc/analyzer/engine.cc:2253
0xe16e69 impl_run_checkers(logger*)
        ../../gcc-2588197/gcc/analyzer/engine.cc:3570
0xe178d3 run_checkers()
        ../../gcc-2588197/gcc/analyzer/engine.cc:3624
0xe0de58 execute
        ../../gcc-2588197/gcc/analyzer/analyzer-pass.cc:84
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

Confirmed with ab7c7b46c35ed1be68d4c020a2f20ee96f68b64b.

It's due to unhandled case op == UNORDERED_EXPR in
region_model::eval_condition_without_cm
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Subject: [Bug libstdc++/91263] unordered_map and unordered_set operator== double key comparison causes exponential behavior
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91263

--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jonathan Wakely <redi@gcc.gnu.org>:

https://gcc.gnu.org/g:d916538965ea260c6bcdb1d46581f6d572017ce8

commit r10-6005-gd916538965ea260c6bcdb1d46581f6d572017ce8
Author: Franï¿½ois Dumont <fdumont@gcc.gnu.org>
Date:   Thu Jan 16 08:34:21 2020 +0000

    libstdc++: Improve unordered containers == operator (PR 91263)

    Avoid comparing elements with operator== multiple times by replacing
    uses of find and equal_range with equivalent inlined code that uses
    operator== instead of the container's equality comparison predicate.
    This is valid because the standard requires that operator== is a
    refinement of the equality predicate.

    Also replace the _S_is_permutation function with std::is_permutation,
    which wasn't yet implemented when this code was first written.

        PR libstdc++/91263
        * include/bits/hashtable.h (_Hashtable<>): Make _Equality<> friend.
        * include/bits/hashtable_policy.h: Include <bits/stl_algo.h>.
        (_Equality_base): Remove.
        (_Equality<>::_M_equal): Review implementation. Use
        std::is_permutation.
        * testsuite/23_containers/unordered_multiset/operators/1.cc
        (Hash, Equal, test02, test03): New.
        * testsuite/23_containers/unordered_set/operators/1.cc
        (Hash, Equal, test02, test03): New.
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Subject: [Bug rtl-optimization/93272] LRA: EH reg allocated to hold local variable
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93272

--- Comment #2 from Andreas Krebbel <krebbel at gcc dot gnu.org> ---
This problem to some degree is specific to IBM Z since our EH regs are
call-saved registers. For targets using call-clobbered EH regs such a
collisions usually cannot happen. Perhaps it can be provoked with
-fnon-call-exceptions.
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Subject: [Bug fortran/93289] array constructor of different length: Missing diagnostic when PARAMETER is in list
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93289

kargl at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |kargl at gcc dot gnu.org

--- Comment #1 from kargl at gcc dot gnu.org ---
(In reply to Tobias Burnus from comment #0)
> print *, [str, "ab", "hjf333"] ! Accepted, why?
> print *, [str, str2]           ! Accepted, why?
> end

It appears to be an undocumented extension.  Add -Wall to your command line.

% gfcx -Wall -c a.f90
a.f90:2:20:

    2 | print *, [str, "ab", "hjf333"] ! Accepted, why?
      |                    1
Warning: CHARACTER expression at (1) is being truncated (6/3)
[-Wcharacter-truncation]
a.f90:3:14:

    3 | print *, [str, str2]           ! Accepted, why?
      |              1
Warning: CHARACTER expression at (1) is being truncated (4/3)
[-Wcharacter-truncation]
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Subject: [Bug analyzer/93290] analyzer ICE on isnan()
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David Malcolm <dmalcolm at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2020-01-16
     Ever confirmed|0                           |1
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Subject: [Bug rtl-optimization/93264] [10 Regression] ICE in cfg_layout_redirect_edge_and_branch_force, at cfgrtl.c:4522
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93264

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

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----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2020-01-16
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                   |                            |jakub at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
It tries to redirect a crossing jump from cold to hot partition to a new bb
that is in cold partition.
cfg_layout_redirect_edge_and_branch has code to handle this case, but only if
the 
branch is simplejump:
4429      if (e->flags & EDGE_CROSSING
4430          && BB_PARTITION (e->src) == BB_PARTITION (dest)
4431          && simplejump_p (BB_END (src)))
4432        {
4433          if (dump_file)
4434            fprintf (dump_file,
4435                     "Removing crossing jump while redirecting edge form %i
to %i\n",
4436                     e->src->index, dest->index);
4437          delete_insn (BB_END (src));
4438          remove_barriers_from_footer (src);
4439          e->flags |= EDGE_FALLTHRU;
4440        }
which is not the case here:
(insn 577 350 578 27 (set (reg:DI 309)
        (high:DI (label_ref:DI 220))) "pr71550.c":19:20 -1
     (insn_list:REG_LABEL_OPERAND 220 (nil)))
(insn 578 577 579 27 (set (reg:DI 308)
        (lo_sum:DI (reg:DI 309)
            (label_ref:DI 220))) "pr71550.c":19:20 -1
     (insn_list:REG_LABEL_OPERAND 220 (expr_list:REG_EQUAL (label_ref:DI 220)
            (nil))))
(jump_insn/j 579 578 220 27 (set (pc)
        (reg:DI 308)) "pr71550.c":19:20 -1
     (nil)
 -> 220)
The generic code really doesn't know what it should remove to replace it with
the fallthru edge.
So, I'd say something in the caller or a few callers up should have punted on
it before, but no idea what.
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From: "mahatma at eu dot by" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/40838] gcc shouldn't assume that the stack is aligned
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=40838

--- Comment #97 from Dzianis Kahanovich <mahatma at eu dot by> ---
No. Looking into gcc/opts.c - "-O3 optimizations" section - line:
{ OPT_LEVELS_3_PLUS, OPT_fvect_cost_model_, NULL, VECT_COST_MODEL_DYNAMIC },

- so, for -O3 it's "dynamic". Then, RTFM, "cheap" more cares about aligning.
But anymore, I not try to rebuild 32bit "world" without ANY workaround, so all
still dirty ;)

PS For some options configuration behaviour still non-linear, so queryng "gcc
-Q ..." still unsafe to check some defaults...

(In reply to Viktor Ostashevskyi from comment #96)
> Honestly, I don't see how your compiler flags could help. cost-model=cheap
> is default, data-alignment doesn't change incoming stack alignment.
> 
> ÑÑ€, 15 ÑÑ–Ñ‡. 2020, 14:31 ÐºÐ¾Ñ€Ð¸ÑÑ‚ÑƒÐ²Ð°Ñ‡ mahatma at eu dot by <
> gcc-bugzilla@gcc.gnu.org> Ð¿Ð¸ÑˆÐµ:
> 
> > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=40838
> >
> > --- Comment #95 from Dzianis Kahanovich <mahatma at eu dot by> ---
> > Just FYI. Novadays, on my Thinkpad tablet with Atom (32 bit userspace
> > Gentoo),
> > I globally replace patch/-mstackrealign to "-fvect-cost-model=cheap
> > -fsimd-cost-model=cheap -malign-data=cacheline" and all works fine for -O3
> > +.
> > (This is dirty example, as cacheline for some old SSE CPUs are different,
> > etc).
> >
> > --
> > You are receiving this mail because:
> > You are on the CC list for the bug.
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Subject: [Bug c++/93285] [10 Regression] ICE in cp_gimplify_expr, at cp/cp-gimplify.c:931 since g:08f594eb399dab06
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93285

Jason Merrill <jason at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |jason at gcc dot gnu.org
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Subject: [Bug target/40838] gcc shouldn't assume that the stack is aligned
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=40838

--- Comment #98 from Dzianis Kahanovich <mahatma at eu dot by> ---
fix: "I not try to rebuild 32bit "world" without ANY workaround" - on modern
gcc (now all under 9.2). Previous experiments was times & versions ago, so many
other new factors/fixes can solve most issues.
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From: "pmatos at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug analyzer/93288] ICE in supergraph.cc:180
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93288

--- Comment #2 from pmatos at gcc dot gnu.org ---
(In reply to David Malcolm from comment #1)
> Note that C++ is out-of-scope for the analyzer for GCC 10.
> 
> Program received signal SIGSEGV, Segmentation fault.
> 0x0000000001cb37ed in supergraph::supergraph (this=0x7fffffffcda0,
> logger=0x0)
>     at ../../src/gcc/analyzer/supergraph.cc:180
> 180		    = ENTRY_BLOCK_PTR_FOR_FN (edge->callee->get_fun ());
> Missing separate debuginfos, use: dnf debuginfo-install
> gmp-6.1.2-10.fc30.x86_64 libmpc-1.1.0-3.fc30.x86_64
> libzstd-1.4.2-1.fc30.x86_64 mpfr-3.1.6-4.fc30.x86_64
> 
> (gdb) p edge->callee
> $1 = <cgraph_node * 0x7fffeaaaa2d0 "__ct_comp "/2>
> 
> (gdb) p edge->callee->get_fun()->cfg
> $4 = (control_flow_graph *) 0x0
> 
> So it's a segfault reading through a NULL cfg pointer.

Ah - sorry. I was not aware of that. :)
I will test it on C only for now then. Thanks. Feel free to close this if you
wish.
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Subject: [Bug target/40838] gcc shouldn't assume that the stack is aligned
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=40838

--- Comment #99 from Dzianis Kahanovich <mahatma at eu dot by> ---
PPS About some hidden thinks/things. In pure theory. "*cost-model=cheap" can
reduce SSE usage, -mstackrealign - can increase function prolog/epilog
overhead. In my case - x7-Z8700 CPU have 2 FPU cores for 4 CPU cores
(silvermont-1 have even less FPUs), so solution looks sure better then
"-mstackrealign". But on some other CPUs something may be else and need to be
tested about performance.
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Subject: [Bug analyzer/93291] New: 'FAIL: gcc.dg/analyzer/pattern-test-2.c' for a few configurations
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93291

            Bug ID: 93291
           Summary: 'FAIL: gcc.dg/analyzer/pattern-test-2.c' for a few
                    configurations
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
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          Assignee: dmalcolm at gcc dot gnu.org
          Reporter: tschwinge at gcc dot gnu.org
  Target Milestone: ---

Testing 299ddc612136421f1d9865ea4f2f84f7e3791824 on
powerpc64le-unknown-linux-gnu, I see:

    PASS: gcc.dg/analyzer/pattern-test-2.c  (test for warnings, line 11)
    PASS: gcc.dg/analyzer/pattern-test-2.c  (test for warnings, line 11)
    FAIL: gcc.dg/analyzer/pattern-test-2.c  (test for warnings, line 21)
    FAIL: gcc.dg/analyzer/pattern-test-2.c  (test for warnings, line 21)
    PASS: gcc.dg/analyzer/pattern-test-2.c  (test for warnings, line 21)
    PASS: gcc.dg/analyzer/pattern-test-2.c  (test for warnings, line 21)
    FAIL: gcc.dg/analyzer/pattern-test-2.c (test for excess errors)

    [...]/gcc/testsuite/gcc.dg/analyzer/pattern-test-2.c: In function 'test1':
    [...]/gcc/testsuite/gcc.dg/analyzer/pattern-test-2.c:11:6: warning: pattern
match on 'ptr != 0'
    [...]/gcc/testsuite/gcc.dg/analyzer/pattern-test-2.c:11:6: note: (1) here
('ptr' is in state 'start')
    [...]/gcc/testsuite/gcc.dg/analyzer/pattern-test-2.c:11:6: warning: pattern
match on 'ptr == 0'
    [...]/gcc/testsuite/gcc.dg/analyzer/pattern-test-2.c:11:6: note: (1) here
('ptr' is in state 'start')
    [...]/gcc/testsuite/gcc.dg/analyzer/pattern-test-2.c: In function 'test_2':
    [...]/gcc/testsuite/gcc.dg/analyzer/pattern-test-2.c:21:6: warning: pattern
match on 'p != 0'
    [...]/gcc/testsuite/gcc.dg/analyzer/pattern-test-2.c:21:6: note: (1) here
('p' is in state 'start')
    [...]/gcc/testsuite/gcc.dg/analyzer/pattern-test-2.c:21:6: warning: pattern
match on 'p == 0'
    [...]/gcc/testsuite/gcc.dg/analyzer/pattern-test-2.c:21:6: note: (1) here
('p' is in state 'start')
    [...]/gcc/testsuite/gcc.dg/analyzer/pattern-test-2.c:21:17: warning:
pattern match on 'q == 0'
    [...]/gcc/testsuite/gcc.dg/analyzer/pattern-test-2.c:21:6: note: (1)
following 'false' branch (when 'p' is non-NULL)...
    [...]/gcc/testsuite/gcc.dg/analyzer/pattern-test-2.c:21:17: note: (2) ...to
here
    [...]/gcc/testsuite/gcc.dg/analyzer/pattern-test-2.c:21:17: note: (3) here
('q' is in state 'start')
    [...]/gcc/testsuite/gcc.dg/analyzer/pattern-test-2.c:21:17: warning:
pattern match on 'q != 0'
    [...]/gcc/testsuite/gcc.dg/analyzer/pattern-test-2.c:21:6: note: (1)
following 'false' branch (when 'p' is non-NULL)...
    [...]/gcc/testsuite/gcc.dg/analyzer/pattern-test-2.c:21:17: note: (2) ...to
here
    [...]/gcc/testsuite/gcc.dg/analyzer/pattern-test-2.c:21:17: note: (3) here
('q' is in state 'start')

    Excess errors:
    [...]/gcc/testsuite/gcc.dg/analyzer/pattern-test-2.c:21:6: warning: pattern
match on 'p == 0'
    [...]/gcc/testsuite/gcc.dg/analyzer/pattern-test-2.c:21:17: warning:
pattern match on 'q == 0'

Per <gcc-testresults@gcc.gnu.org>, this happens for a few configurations:
powerpc64le-unknown-linux-gnu, pru-unknown-elf, moxie-unknown-elf,
m68k-unknown-linux-gnu, powerpc-ibm-aix7.2.0.0.
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Subject: [Bug c/93278] huge almost empty array takes huge time to compile and produces huge object file
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--- Comment #2 from doug mcilroy <doug at cs dot dartmouth.edu> ---
My error. I omitted half the program. The bad behavior is exhibited by
        char a{HUGE] = "x";
        int main(){ return 0; }
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Subject: [Bug libstdc++/91263] unordered_map and unordered_set operator== double key comparison causes exponential behavior
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--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed on trunk. Let's keep this open and decide whether to backport it to the
release branches.
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Subject: [Bug analyzer/93293] New: 'FAIL: gcc.dg/analyzer/dot-output.c dg-check-dot dot-output.c.state-purge.dot'
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93293

            Bug ID: 93293
           Summary: 'FAIL: gcc.dg/analyzer/dot-output.c dg-check-dot
                    dot-output.c.state-purge.dot'
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: analyzer
          Assignee: dmalcolm at gcc dot gnu.org
          Reporter: tschwinge at gcc dot gnu.org
  Target Milestone: ---

Testing 299ddc612136421f1d9865ea4f2f84f7e3791824 on x86_64-pc-linux-gnu, I see:

    XFAIL: gcc.dg/analyzer/dot-output.c  (test for warnings, line 21)
    PASS: gcc.dg/analyzer/dot-output.c (test for excess errors)
    PASS: gcc.dg/analyzer/dot-output.c dg-check-dot dot-output.c.callgraph.dot
    PASS: gcc.dg/analyzer/dot-output.c dg-check-dot dot-output.c.eg.dot
    FAIL: gcc.dg/analyzer/dot-output.c dg-check-dot
dot-output.c.state-purge.dot
    PASS: gcc.dg/analyzer/dot-output.c dg-check-dot dot-output.c.supergraph.dot

    spawn dot -O -Tpng dot-output.c.state-purge.dot
    Warning: dot-output.c.state-purge.dot:11: string ran past end of line
    Error: dot-output.c.state-purge.dot:12: syntax error near line 12
    context:  >>> ' <<< _5' not needed here
    Warning: dot-output.c.state-purge.dot:34: string ran past end of line
    Warning: dot-output.c.state-purge.dot:45: string ran past end of line
    Warning: dot-output.c.state-purge.dot:68: string ran past end of line
    [etc.]

      1 digraph "supergraph" {
      2   overlap=false;
      3   compound=true;
      4   subgraph "cluster_test_2" {
      5 style="dashed"; color="black"; label="test_2";
      6     subgraph cluster_node_0 {
      7       style="solid";
      8       color="black";
      9       fillcolor="lightgrey";
     10       label="sn: 0";
     11 annotation_for_node_0
[shape=none,margin=0,style=filled,fillcolor=lightblue,label="'c1_4' not needed
here
     12 '_5' not needed here
     13 
    [more empty lines]
     33 
     34 "];
     35 
     36       node_0
[shape=none,margin=0,style=filled,fillcolor=lightgrey,label=<<TABLE
BORDER="0"><TR><TD>ENTRY</TD></TR>
     37 </TABLE>>];
     38 
     39     }
     40     subgraph cluster_node_1 {
     41       style="solid";
     42       color="black";
     43       fillcolor="lightgrey";
     44       label="sn: 1";
     45 annotation_for_node_1
[shape=none,margin=0,style=filled,fillcolor=lightblue,label="'c1_4' not needed
here
     46 '_5' not needed here
     47 
    [more empty lines]
    [etc.]

That's Ubuntu 12.10:

    $ dot -V
    dot - graphviz version 2.26.3 (20100126.1600)

... perhaps too old to deal with such multi-line strings -- but perhaps they
shouldn't be generated like that?
>From gcc-bugs-return-665790-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 16 16:25:14 2020
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Subject: [Bug tree-optimization/93292] New: [10 Regression] ICE (segfault) in vectorizable_comparison on powerpc64le-linux-gnu
Date: Thu, 16 Jan 2020 16:25:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93292

            Bug ID: 93292
           Summary: [10 Regression] ICE (segfault) in
                    vectorizable_comparison on powerpc64le-linux-gnu
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: doko at ubuntu dot com
  Target Milestone: ---

seen with 20200116 on powerpc64-linux-gnu


$ cat editor_profiler.ii
class a {
public:
  static int c(float p1) {
    static int b;
    b = p1 ? p1 + 0.5 : 0;
    return b;
  }
};
int *d;
float e;
void f() {
  float g;
  for (int h; h; h++) {
    d[h] += a::c(g < 0 ?: g > 5 ?: g);
    a::c(e);
  }
}

$ g++ -c -O3 -fstack-protector-strong editor_profiler.ii
during GIMPLE pass: vect
editor_profiler.ii: In function â€˜void f()â€™:
editor_profiler.ii:11:6: internal compiler error: Segmentation fault
   11 | void f() {
      |      ^
0x10a217c3 crash_signal
        ../../src/gcc/toplev.c:328
0x10c9c79c TYPE_VECTOR_SUBPARTS(tree_node const*)
        ../../src/gcc/tree.h:3836
0x10c9c79c vectorizable_comparison
        ../../src/gcc/tree-vect-stmts.c:10495
0x10cad147 vect_analyze_stmt(_stmt_vec_info*, bool*, _slp_tree*,
_slp_instance*, vec<stmt_info_for_cost, va_heap, vl_ptr>*)
        ../../src/gcc/tree-vect-stmts.c:10907
0x10cdb0ef vect_slp_analyze_node_operations
        ../../src/gcc/tree-vect-slp.c:2786
0x10cdb053 vect_slp_analyze_node_operations
        ../../src/gcc/tree-vect-slp.c:2850
0x10cdb053 vect_slp_analyze_node_operations
        ../../src/gcc/tree-vect-slp.c:2850
0x10cdb053 vect_slp_analyze_node_operations
        ../../src/gcc/tree-vect-slp.c:2850
0x10cdb053 vect_slp_analyze_node_operations
        ../../src/gcc/tree-vect-slp.c:2850
0x10cdf97f vect_slp_analyze_operations(vec_info*)
        ../../src/gcc/tree-vect-slp.c:2926
0x10ce208f vect_slp_analyze_bb_1
        ../../src/gcc/tree-vect-slp.c:3250
0x10ce208f vect_slp_bb_region
        ../../src/gcc/tree-vect-slp.c:3311
0x10ce208f vect_slp_bb(basic_block_def*)
        ../../src/gcc/tree-vect-slp.c:3446
0x10ce79eb try_vectorize_loop_1
        ../../src/gcc/tree-vectorizer.c:946
0x10ce83ff vectorize_loops()
        ../../src/gcc/tree-vectorizer.c:1125
0x10baec9f execute
        ../../src/gcc/tree-ssa-loop.c:414
Please submit a full bug report,
with preprocessed source if appropriate.
>From gcc-bugs-return-665792-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 16 16:34:27 2020
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Subject: [Bug target/93133] __builtin_isgreater emits trapping compare instruction
Date: Thu, 16 Jan 2020 16:34:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93133

rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |rsandifo at gcc dot gnu.org

--- Comment #3 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
Mine.  TBH I'm not really sure why the AArch64 definition
of REVERSE_CONDITION is there.  We can't use CCFP GT as
a form of quiet GT (!UNLT) since it still looks to the
target-independent code like a normal signalling GT,
even if we ever did code-generate it differently.
And there should be no target-specific reasons for
turning a CCFPE GT into a CCFPE UNLT.

So let's see how much breaks if we just remove the
definition. :-)
>From gcc-bugs-return-665793-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 16 16:37:49 2020
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Subject: [Bug fortran/93289] array constructor of different length: Missing diagnostic when PARAMETER is in list
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93289

--- Comment #2 from Tobias Burnus <burnus at gcc dot gnu.org> ---
(In reply to kargl from comment #1)
> It appears to be an undocumented extension. Add -Wall to your command line.

I would rather call it a bug :-)

The truncation warning is a separate thing. For instance, it (correctly)
triggers for the following valid code:

  print *, [character(len=2) :: "ab", "hjf333"]

and it does not trigger for the invalid

  character(len=*), parameter :: str = "123"
  print *, [str, "ab"]
  end

(Obviously also not for the valid "[character(len=20) :: "ab", str]".)
>From gcc-bugs-return-665794-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 16 16:37:51 2020
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Subject: [Bug target/93133] __builtin_isgreater emits trapping compare instruction
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--- Comment #4 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
(In reply to rsandifo@gcc.gnu.org from comment #3)
> Mine.  TBH I'm not really sure why the AArch64 definition
> of REVERSE_CONDITION is there.  We can't use CCFP GT as
> a form of quiet GT (!UNLT) [...]

Of course I meant !UNLE here.
>From gcc-bugs-return-665796-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 16 16:52:41 2020
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Subject: [Bug testsuite/93294] [10 Regression] Addition of -fdiagnostic-urls=never to testsuite flags broke compat.exp testing with ALT_CC_UNDER_TEST=gcc etc.
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:

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     Ever confirmed|0                           |1
>From gcc-bugs-return-665795-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 16 16:52:29 2020
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Subject: [Bug testsuite/93294] New: [10 Regression] Addition of -fdiagnostic-urls=never to testsuite flags broke compat.exp testing with ALT_CC_UNDER_TEST=gcc etc.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93294

            Bug ID: 93294
           Summary: [10 Regression] Addition of -fdiagnostic-urls=never to
                    testsuite flags broke compat.exp testing with
                    ALT_CC_UNDER_TEST=gcc etc.
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
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  Target Milestone: ---

All the compat.exp tests now FAIL if the alt compiler doesn't support this new
option.
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Subject: [Bug fortran/93289] array constructor of different length: Missing diagnostic when PARAMETER is in list
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93289

--- Comment #3 from Tobias Burnus <burnus at gcc dot gnu.org> ---
Okay, it is indeed a -std=gnu extension. I still regard it as bug that it
differs, but we can now think about which one to change. Namely:


In the always-error case (i.e. literal first):
* gfc_resolve_character_array_constructor
  â€¦
  if (expr->ts.u.cl->length == NULL)
  â€¦
          else if (found_length != current_length)
            {
              gfc_error ("Different CHARACTER lengths (%ld/%ld) in array"
                         " constructor at %L", (long) found_length,

In the other case, one has:

* gfc_resolve_character_array_constructor
  â€¦
  if (expr->ts.u.cl->length == NULL)
  â€¦
  else
  â€¦
                gfc_set_constant_character_len (found_length, p->expr,
                                                has_ts ? -1 : current_length);

And in gfc_set_constant_character_len:

      if (check_len != -1 && slen != check_len
          && !(gfc_option.allow_std & GFC_STD_GNU))
        gfc_error_now ("The CHARACTER elements of the array constructor "
                       "at %L must have the same length (%ld/%ld)",
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Subject: [Bug c++/92517] [10 Regression] ICE on incorrect syntax involving requires and decltype
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92517

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2020-01-16
                 CC|                            |jakub at gcc dot gnu.org,
                   |                            |jason at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
This happens during tentative parsing, so no errors are reported for decltype
not being followed by ( auto ) tokens and we segfault on trying to dereference
NULL open_paren to get open_paren->location.

The following patch avoids the ICE, on this testcase then reports:
--- gcc/cp/parser.c.jj  2020-01-16 12:15:47.211552009 +0100
+++ gcc/cp/parser.c     2020-01-16 17:41:39.322353708 +0100
@@ -18237,10 +18237,15 @@ cp_parser_placeholder_type_specifier (cp
          placeholder = cp_lexer_consume_token (parser->lexer);
          open_paren = cp_parser_require (parser, CPP_OPEN_PAREN,
                                          RT_OPEN_PAREN);
-         cp_parser_require_keyword (parser, RID_AUTO, RT_AUTO);
+         if (!open_paren)
+           return error_mark_node;
+         if (!cp_parser_require_keyword (parser, RID_AUTO, RT_AUTO))
+           return error_mark_node;
           close_paren = cp_parser_require (parser, CPP_CLOSE_PAREN,
                                           RT_CLOSE_PAREN,
                                           open_paren->location);
+         if (!close_paren)
+           return error_mark_node;
        }
     }

pr92517.C:5:10: error: â€˜Câ€™ does not name a type
    5 | requires C decltype<I>
      |          ^

Is that what we want, or do we want to emit an error even during tentative
parsing, or make the whole function deal with NULL open_paren and/or
close_paren and let the caller's do something?  For open_paren it would be a
matter of open_paren ? open_paren->location : UNKNOWN_LOCATION, for close_paren
there is a single spot where we could use placeholder->location if close_paren
is NULL.
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Subject: [Bug bootstrap/64271] Minimal patches to bootstrap on NetBSD
Date: Thu, 16 Jan 2020 17:23:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64271

--- Comment #15 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jonathan Wakely <redi@gcc.gnu.org>:

https://gcc.gnu.org/g:98d56ea8900fdcff8f1987cf2bf499a5b7399857

commit r10-6022-g98d56ea8900fdcff8f1987cf2bf499a5b7399857
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Fri Jan 10 16:01:19 2020 +0000

    libstdc++: std::ctype fixes for recent versions of NetBSD

    This removes support for EOL versions of NetBSD and syncs the
    definitions with patches from NetBSD upstream.

    The only change here that isn't from upstream is to use _CTYPE_BL for
    the isblank class, which is correct but wasn't previously done either in
    FSF GCC or the NetBSD packages.

    2020-01-16  Kai-Uwe Eckhardt  <kuehro@gmx.de>
            Matthew Bauer  <mjbauer95@gmail.com>
            Jonathan Wakely  <jwakely@redhat.com>

        PR bootstrap/64271 (partial)
        * config/os/bsd/netbsd/ctype_base.h (ctype_base::mask): Change type
        to unsigned short.
        (ctype_base::alpha, ctype_base::digit, ctype_base::xdigit)
        (ctype_base::print, ctype_base::graph, ctype_base::alnum): Sync
        definitions with NetBSD upstream.
        (ctype_base::blank): Use _CTYPE_BL.
        * config/os/bsd/netbsd/ctype_configure_char.cc (_C_ctype_): Remove
        Declaration.
        (ctype<char>::classic_table): Use _C_ctype_tab_ instead of _C_ctype_.
        (ctype<char>::do_toupper, ctype<char>::do_tolower): Cast char
        parameters to unsigned char.
        * config/os/bsd/netbsd/ctype_inline.h (ctype<char>::is): Likewise.
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Subject: [Bug target/93133] __builtin_isgreater emits trapping compare instruction
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93133

--- Comment #5 from Segher Boessenkool <segher at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #1)
> This happens during combine.  If whether the comparison raises exception or
> not is distinguished on aarch64 with CCFPEmode vs. CCFPmode, then guess the
> problem is when that distinction gets ignored (unless in fast-math mode) or
> when it goes away completely.

combine isn't wrong here.  Describing anything else than the result of the
comparison with different CCmodes is what is wrong.
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Subject: [Bug fortran/93289] array constructor of different length: Missing diagnostic when PARAMETER is in list
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93289

--- Comment #4 from Steve Kargl <sgk at troutmask dot apl.washington.edu> ---
On Thu, Jan 16, 2020 at 05:14:44PM +0000, burnus at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93289
> 
> --- Comment #3 from Tobias Burnus <burnus at gcc dot gnu.org> ---
> Okay, it is indeed a -std=gnu extension. I still regard it as bug that it
> differs, but we can now think about which one to change. Namely:

IMHO, yes, it is a bug.  I have come to believe that
anything that is an extension should emit a error/warning.
This includes defacto standard things like REAL*4, where
a new -fallow-invalid-typespec would accept REAL*4 with
a warning and -Winvalid-typespec could be used to suppress
the warning.

FOr this particular bug, you also need to look in array.c.
For example, in gfc_match_array_constructor(), gfortran
walks the constructor to check for compatible typespecs
of constructor components if a type spec is present (ie.,
[real(4) :: x, y]).  See lines 1292-1332.  The is also
the function walk_array_constructor().
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Subject: [Bug c++/93280] [10 Regression] ICE: in cp_gimplify_expr, at cp /cp-gimplify.c:933 since g:08f594eb399dab06
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93280

--- Comment #4 from Jason Merrill <jason at gcc dot gnu.org> ---
*** Bug 93285 has been marked as a duplicate of this bug. ***
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Subject: [Bug c++/93285] [10 Regression] ICE in cp_gimplify_expr, at cp/cp-gimplify.c:931 since g:08f594eb399dab06
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Jason Merrill <jason at gcc dot gnu.org> changed:

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----------------------------------------------------------------------------
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         Resolution|---                         |DUPLICATE

--- Comment #1 from Jason Merrill <jason at gcc dot gnu.org> ---
dup.

*** This bug has been marked as a duplicate of bug 93280 ***
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Subject: [Bug c++/93280] [10 Regression] ICE: in cp_gimplify_expr, at cp /cp-gimplify.c:933 since g:08f594eb399dab06
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Subject: [Bug tree-optimization/93292] [10 Regression] ICE (segfault) in vectorizable_comparison on powerpc64le-linux-gnu
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93292

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 47661
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47661&action=edit
gcc10-pr93292.patch

Untested fix.
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Subject: [Bug libstdc++/87106] Group move and destruction of the source, where possible, for speed
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--- Comment #28 from Dan Stahlke <dan at stahlke dot org> ---
Thank you.  That makes sense.  I had asked about it here:
https://stackoverflow.com/questions/59690019  I was directed to this thread,
and linked back to the SO thread you provided.
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Subject: [Bug c/93278] huge almost empty array takes huge time to compile and produces huge object file
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--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
If you mean [ rather than { before HUGE, that doesn't change anything at all.
Maybe it is assembler or linker that need a lot of memory or time, but gcc
certainly doesn't.
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Subject: [Bug libstdc++/87106] Group move and destruction of the source, where possible, for speed
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--- Comment #29 from Marc Glisse <glisse at gcc dot gnu.org> ---
Note that __is_bitwise_relocatable is specialized to true for deque, so we are
not super consistent here ;-)
The original patch used is_trivially_move_constructible, IIRC I changed it to
is_trivial so the review wouldn't turn into a lengthy discussion on the
subject, but I don't think going back to is_trivially_move_constructible would
cause miscompilations (maybe warnings with -Wsystem-headers).
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Subject: [Bug c++/93295] New: ICE in alias_ctad_tweaks
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93295

            Bug ID: 93295
           Summary: ICE in alias_ctad_tweaks
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
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          Reporter: ensadc at mailnesia dot com
  Target Milestone: ---

https://wandbox.org/permlink/B02uUhc2QP8OChB9
====
template<class T>
struct A { A(int); };

template<class T>
A(T) -> A<T*>;

template<class T, class = int>
using B = A<T>;

B a(0);

====
prog.cc:10:12: internal compiler error: in alias_ctad_tweaks, at cp/pt.c:28223
   10 | B a((int*)0);
      |            ^
0x5b9faa alias_ctad_tweaks
        ../../source/gcc/cp/pt.c:28223
0x5b9faa deduction_guides_for
        ../../source/gcc/cp/pt.c:28395
0x7048b3 do_class_deduction
        ../../source/gcc/cp/pt.c:28500
0x7048b3 do_auto_deduction(tree_node*, tree_node*, tree_node*, int,
auto_deduction_context, tree_node*, int)
        ../../source/gcc/cp/pt.c:28629
0x6693e6 cp_finish_decl(tree_node*, tree_node*, bool, tree_node*, int)
        ../../source/gcc/cp/decl.c:7463
0x6eb461 cp_parser_init_declarator
        ../../source/gcc/cp/parser.c:20762
0x6ce805 cp_parser_simple_declaration
        ../../source/gcc/cp/parser.c:13627
0x6f3962 cp_parser_declaration
        ../../source/gcc/cp/parser.c:13325
0x6f4084 cp_parser_translation_unit
        ../../source/gcc/cp/parser.c:4723
0x6f4084 c_parse_file()
        ../../source/gcc/cp/parser.c:43563
0x7bb56b c_common_parse_file()
        ../../source/gcc/c-family/c-opts.c:1186
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

====
The error disappears if `A<T*>` is changed to `A<T>`, or if `, class = int` is
removed.
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Subject: [Bug c++/93295] ICE in alias_ctad_tweaks
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2020-01-16
                 CC|                            |mpolacek at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed.
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Subject: [Bug c++/93295] ICE in alias_ctad_tweaks
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
commit 1a291106384cabc73da0bc0f457b1cd3a4015970
Author: Jason Merrill <jason@redhat.com>
Date:   Wed Nov 27 17:05:53 2019 -0500

    Implement P1814R0, CTAD for alias templates.

    This patch implements C++20 class template argument deduction for alias
    templates, which works by a moderately arcane transformation of the
    deduction guides for the underlying class template.  When implementing it,
    it seemed that I could simplify the rules in the draft a bit and get
    essentially the same effect; I'll be emailing the committee to that effect
    soon.

    gcc/cp/
            * pt.c (rewrite_tparm_list): Factor out of build_deduction_guide.
            (maybe_aggr_guide): Check for copy-init here.
            (alias_ctad_tweaks, deduction_guides_for): New.
            (ctor_deduction_guides_for): Factor out of do_class_deduction.
            (ctad_template_p): New.
            * parser.c (cp_parser_simple_type_specifier): Use it.
            * constraint.cc (append_constraint): New.
    gcc/c-family/
            * c-cppbuiltin.c (c_cpp_builtins): Update __cpp_deduction_guides.

    From-SVN: r278786
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Subject: [Bug c/93239] Enhancement: allow unevaluated statement expressions at filescope
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--- Comment #1 from pskocik at gmail dot com ---
Fixing this seems as simple as removing/commenting-out:

gcc/c/c-parser.c:8195     /* If we've not yet started the current function's
statement list,
gcc/c/c-parser.c:8196        or we're in the parameter scope of an old-style
function
gcc/c/c-parser.c:8197        declaration, statement expressions are not
allowed.  */
gcc/c/c-parser.c:8198     if (!building_stmt_list_p () ||
old_style_parameter_scope ())
gcc/c/c-parser.c:8199       {
gcc/c/c-parser.c:8200         error_at (loc, "braced-group within expression
allowed "
gcc/c/c-parser.c:8201                   "only inside a function");
gcc/c/c-parser.c:8202         parser->error = true;
gcc/c/c-parser.c:8203         c_parser_skip_until_found (parser,
CPP_CLOSE_BRACE, NULL);
gcc/c/c-parser.c:8204         c_parser_skip_until_found (parser,
CPP_CLOSE_PAREN, NULL);
gcc/c/c-parser.c:8205         expr.set_error ();
gcc/c/c-parser.c:8206         break;
gcc/c/c-parser.c:8207       }

This would be both very useful, and it makes all kind of sense, because other
expression constructs (function calls, comma expressions, ...) aren't
restricted syntactically either (just semantically), which means they _can_ be
inside untaken branches of constant-forming _Generic/__builtin_choose_expr, and
I can think of no good reason why statement expressions shouldn't be allowed
there too.
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Subject: [Bug target/91298] $ at the beginging causing Error: junk `(%rip)' after expression
Date: Thu, 16 Jan 2020 21:03:00 -0000
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pskocik at gmail dot com changed:

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----------------------------------------------------------------------------
                 CC|                            |pskocik at gmail dot com

--- Comment #4 from pskocik at gmail dot com ---
Related https://gcc.gnu.org/bugzilla/show_bug.cgi?id=45591 .

I've played with it and this simple patch

diff --git a/gcc/final.c b/gcc/final.c
index fefc4874b24a..ba7425afa667 100644
--- a/gcc/final.c
+++ b/gcc/final.c
@@ -4087,11 +4087,20 @@ output_addr_const (FILE *file, rtx x)
     case SYMBOL_REF:
       if (SYMBOL_REF_DECL (x))
        assemble_external (SYMBOL_REF_DECL (x));
-#ifdef ASM_OUTPUT_SYMBOL_REF
-      ASM_OUTPUT_SYMBOL_REF (file, x);
-#else
-      assemble_name (file, XSTR (x, 0));
-#endif
+
+         {
+                 bool dollar_eh = XSTR(x,0)[0] == '$';
+                 if (dollar_eh) fputc('(',file);
+
+       #ifdef ASM_OUTPUT_SYMBOL_REF
+                 ASM_OUTPUT_SYMBOL_REF (file, x);
+       #else
+                 assemble_name (file, XSTR (x, 0));
+       #endif
+
+                 if (dollar_eh) fputc(')',file);
+         }
+
       break;

     case LABEL_REF:

seems to fix it, at least for x86-64. Basically you need parentheses around
names of globals (at least those that start with `$`) when they're used as
operands.

The parentheses is what clang does.

Both clang and tinycc have no problem with this. It would be great if gcc could
catch up.
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Subject: [Bug tree-optimization/93292] [10 Regression] ICE (segfault) in vectorizable_comparison on powerpc64le-linux-gnu since r10-5071
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:

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----------------------------------------------------------------------------
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             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2020-01-16
           Assignee|unassigned at gcc dot gnu.org      |jakub at gcc dot gnu.org
   Target Milestone|---                         |10.0
            Summary|[10 Regression] ICE         |[10 Regression] ICE
                   |(segfault) in               |(segfault) in
                   |vectorizable_comparison on  |vectorizable_comparison on
                   |powerpc64le-linux-gnu       |powerpc64le-linux-gnu since
                   |                            |r10-5071
     Ever confirmed|0                           |1

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with r10-5071-g02d895504cc59be06fc3f7ec0cfd4eb160561211.
>From gcc-bugs-return-665815-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 16 21:32:12 2020
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Subject: [Bug analyzer/93291] 'FAIL: gcc.dg/analyzer/pattern-test-2.c' for a few configurations
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--- Comment #1 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Thanks.  The test is rather over-specified, it seems.

x86_64 gimple for test_2 is:

  _1 = p_5(D) == 0B;
  _2 = q_6(D) == 0B;
  _3 = _1 | _2;
  if (_3 != 0)
    goto <bb 4>; [51.12%]
  else
    goto <bb 3>; [48.88%]


powerpc64le gimple for test_2 has:

  if (p_2(D) == 0B)
    goto <bb 5>; [18.09%]
  else
    goto <bb 3>; [81.91%]

  <bb 3> [local count: 879501929]:
  if (q_3(D) == 0B)
    goto <bb 5>; [30.95%]
  else
    goto <bb 4>; [69.05%]

So on x86_64, it's done both comparisons against NULL first, and optimized the
|| into:
  _3 = _1 | _2;
whereas on powerpc64le it uses control flow to do this.

The purpose of this test is to verify that the pattern-matching detects the
underlying conditionals in the presence of that "_3 = _1 | _2;" optimization,
so maybe a gimple FE test might be appropriate here.

I'm not sure where the difference between the targets originates; is there a
way to force the usage of bitwise-or here?
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Subject: [Bug c++/93028] internal compiler error: in write_type, at cp/mangle.c:2073
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--- Comment #7 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Trying to compile test.cpp from Comment 5 again, I did see an ICE:

internal compiler error: tree check: expected tree that contains â€˜decl minimalâ€™
structure, have â€˜tree_listâ€™ in lookup_type_scope_1, at cp/name-lookup.c:6492
0x1829be2 tree_contains_struct_check_failed(tree_node const*,
tree_node_structure_enum, char const*, int, char const*)
        ../../gcc/tree.c:10071
0x83f864 contains_struct_check(tree_node*, tree_node_structure_enum, char
const*, int, char const*)
        ../../gcc/tree.h:3311
0xa02cae lookup_type_scope_1
        ../../gcc/cp/name-lookup.c:6492
0xa02fab lookup_type_scope(tree_node*, tag_scope)
        ../../gcc/cp/name-lookup.c:6535
0x93d757 lookup_and_check_tag
        ../../gcc/cp/decl.c:13990
0x93deff xref_tag_1
        ../../gcc/cp/decl.c:14104
0x93e8a8 xref_tag(tag_types, tree_node*, tag_scope, bool)
        ../../gcc/cp/decl.c:14226
0xa34cab cp_parser_elaborated_type_specifier
        ../../gcc/cp/parser.c:18583
0xa328e6 cp_parser_type_specifier
        ../../gcc/cp/parser.c:17450
0xa2ce49 cp_parser_decl_specifier_seq
        ../../gcc/cp/parser.c:14120
0xa48668 cp_parser_single_declaration
        ../../gcc/cp/parser.c:28165
0xa477da cp_parser_template_declaration_after_parameters
        ../../gcc/cp/parser.c:27846
0xa484fc cp_parser_explicit_template_declaration
        ../../gcc/cp/parser.c:28094
0xa48556 cp_parser_template_declaration_after_export
        ../../gcc/cp/parser.c:28113
0xa2f573 cp_parser_template_declaration
        ../../gcc/cp/parser.c:15594
0xa41183 cp_parser_member_declaration
        ../../gcc/cp/parser.c:24332
0xa41076 cp_parser_member_specification_opt
        ../../gcc/cp/parser.c:24259
0xa3efdd cp_parser_class_specifier_1
        ../../gcc/cp/parser.c:23400
0xa3fe34 cp_parser_class_specifier
        ../../gcc/cp/parser.c:23662
0xa32844 cp_parser_type_specifier
        ../../gcc/cp/parser.c:17424
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

but that got fixed by 41d93b16cac5b348b7883e259f7880b4a0addc23
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Jason Merrill <jason at gcc dot gnu.org> changed:

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Subject: [Bug analyzer/93293] 'FAIL: gcc.dg/analyzer/dot-output.c dg-check-dot dot-output.c.state-purge.dot'
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--- Comment #1 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Thanks for filing this.

I was using record-style labels, but switched to HTML-style labels when I
upgraded graphviz and my record-style labels stopped working.

Based on
  https://lists.freedesktop.org/archives/wayland-devel/2017-June/034218.html
which says:
> http://www.graphviz.org/content/i-havent-been-able-render-these-files-graphviz-226
> indicates that the error message basically means that the authors of
> graphviz consider record-style labels to be deprecated and are no
> longer fixing errors with them. This patch changes the labels to be
> in the HTML style, which seems to require duplicating style between all
> the nodes, but it's not like these files are often edited.

That link is a 404, but archive.org has:
 
https://web.archive.org/web/20170816104830/http://www.graphviz.org:80/content/i-havent-been-able-render-these-files-graphviz-226

So it seems there should probably be a minimum version of graphviz in that
DejaGnu test.

Works for me with graphviz-2.40.1-46.fc30.x86_64, FWIW.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93239

--- Comment #2 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
I'd be concerned about trouble when code processing statements tries to 
deal with context that doesn't exist outside of functions.  Consider a 
statement expression containing a function definition (does that count as 
a nested function?), statement expressions containing declarations, 
possibly with extern, possibly not (how do those interact with file-scope 
declarations?), statement expressions containing _Atomic operations (see 
the sort of issues we had in bug 65345, though that was fixed), statement 
expressions containing __local__ declarations and goto.  It would be 
necessary to go through language features systematically, especially 
declarations and language features that try to create declarations 
internally, to ensure they behave sensibly inside statement expressions at 
file scope - and to test all the same features in old-style parameter 
declarations to ensure declarations from those features don't get mixed up 
in the parameter declaration handling.

(I concur that unevaluated statement expressions *should* be allowed at 
file scope, but think such a change would need pretty extensive test 
coverage of language features that are likely to be risky in such a 
context.)
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Subject: [Bug c++/93036] [9/10 Regression] g++.dg/cpp2a/nontype-class27.C testcase accepted in -std=c++17 mode since r276248
Date: Thu, 16 Jan 2020 21:55:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93036

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Fixed by g:657fea973b000000350c99de9e67bff0438d1503.
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From: "benjamin at readyatdawn dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/93296] New: Compiler error when assigning array to const reference with implicit constructor call.
Date: Thu, 16 Jan 2020 22:22:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93296

            Bug ID: 93296
           Summary: Compiler error when assigning array to const reference
                    with implicit constructor call.
           Product: gcc
           Version: 9.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: benjamin at readyatdawn dot com
  Target Milestone: ---

I'm seeing this error running godbolt.org compiler explorer. I don't have gcc
installed on my PC so I have not attached a preprocessed file, but the bug is
very simple to reproduce. I see the issue with all versions of gcc available on
compiler explorer.

This is the simplest repro I ended up with:

<code>
struct Container {
    Container(int (&)[3]) { }
};

int main() {
    int data[3];
    const Container& container = data;
    return 0;
}
</code>

error: invalid initialization of reference of type 'const Container&' from
expression of type 'int*'

A few changes avoid the issue, these both work:

<code>
    const Container container = data;    // no reference
    const Container& container { data }; // explicit construction
</code>

Compiler output with '-v':

Using built-in specs.

COLLECT_GCC=/opt/compiler-explorer/gcc-9.2.0/bin/g++

Target: x86_64-linux-gnu

Configured with: ../gcc-9.2.0/configure
--prefix=/opt/compiler-explorer/gcc-build/staging --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu --disable-bootstrap
--enable-multiarch --with-abi=m64 --with-multilib-list=m32,m64,mx32
--enable-multilib --enable-clocale=gnu --enable-languages=c,c++,fortran,ada,d
--enable-ld=yes --enable-gold=yes --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --enable-linker-build-id --enable-lto
--enable-plugins --enable-threads=posix
--with-pkgversion=Compiler-Explorer-Build

Thread model: posix

gcc version 9.2.0 (Compiler-Explorer-Build) 

COLLECT_GCC_OPTIONS='-fdiagnostics-color=always' '-g' '-o' './output.s'
'-masm=intel' '-S' '-v' '-shared-libgcc' '-mtune=generic' '-march=x86-64'


/opt/compiler-explorer/gcc-9.2.0/bin/../libexec/gcc/x86_64-linux-gnu/9.2.0/cc1plus
-quiet -v -imultiarch x86_64-linux-gnu -iprefix
/opt/compiler-explorer/gcc-9.2.0/bin/../lib/gcc/x86_64-linux-gnu/9.2.0/
-D_GNU_SOURCE <source> -quiet -dumpbase example.cpp -masm=intel -mtune=generic
-march=x86-64 -auxbase-strip ./output.s -g -version -fdiagnostics-color=always
-o ./output.s

GNU C++14 (Compiler-Explorer-Build) version 9.2.0 (x86_64-linux-gnu)

        compiled by GNU C version 7.4.0, GMP version 6.1.0, MPFR version 3.1.4,
MPC version 1.0.3, isl version isl-0.18-GMP



GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072

ignoring nonexistent directory
"/opt/compiler-explorer/gcc-9.2.0/bin/../lib/gcc/x86_64-linux-gnu/9.2.0/../../../../x86_64-linux-gnu/include"

ignoring duplicate directory
"/opt/compiler-explorer/gcc-9.2.0/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/9.2.0/../../../../include/c++/9.2.0"

ignoring duplicate directory
"/opt/compiler-explorer/gcc-9.2.0/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/9.2.0/../../../../include/c++/9.2.0/x86_64-linux-gnu"

ignoring duplicate directory
"/opt/compiler-explorer/gcc-9.2.0/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/9.2.0/../../../../include/c++/9.2.0/backward"

ignoring duplicate directory
"/opt/compiler-explorer/gcc-9.2.0/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/9.2.0/include"

ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"

ignoring duplicate directory
"/opt/compiler-explorer/gcc-9.2.0/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/9.2.0/include-fixed"

ignoring nonexistent directory
"/opt/compiler-explorer/gcc-9.2.0/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/9.2.0/../../../../x86_64-linux-gnu/include"

#include "..." search starts here:

#include <...> search starts here:


/opt/compiler-explorer/gcc-9.2.0/bin/../lib/gcc/x86_64-linux-gnu/9.2.0/../../../../include/c++/9.2.0


/opt/compiler-explorer/gcc-9.2.0/bin/../lib/gcc/x86_64-linux-gnu/9.2.0/../../../../include/c++/9.2.0/x86_64-linux-gnu


/opt/compiler-explorer/gcc-9.2.0/bin/../lib/gcc/x86_64-linux-gnu/9.2.0/../../../../include/c++/9.2.0/backward

 /opt/compiler-explorer/gcc-9.2.0/bin/../lib/gcc/x86_64-linux-gnu/9.2.0/include


/opt/compiler-explorer/gcc-9.2.0/bin/../lib/gcc/x86_64-linux-gnu/9.2.0/include-fixed

 /usr/local/include

 /opt/compiler-explorer/gcc-9.2.0/bin/../lib/gcc/../../include

 /usr/include/x86_64-linux-gnu

 /usr/include

End of search list.

GNU C++14 (Compiler-Explorer-Build) version 9.2.0 (x86_64-linux-gnu)

        compiled by GNU C version 7.4.0, GMP version 6.1.0, MPFR version 3.1.4,
MPC version 1.0.3, isl version isl-0.18-GMP



GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072

Compiler executable checksum: 35bcd684e0bc8b3378dcc1f162909bba

<source>: In function 'int main()':

<source>:7:34: error: invalid initialization of reference of type 'const
Container&' from expression of type 'int*'

    7 |     const Container& container = data;

      |                                  ^~~~

ASM generation compiler returned: 1

Using built-in specs.

COLLECT_GCC=/opt/compiler-explorer/gcc-9.2.0/bin/g++

COLLECT_LTO_WRAPPER=/opt/compiler-explorer/gcc-9.2.0/bin/../libexec/gcc/x86_64-linux-gnu/9.2.0/lto-wrapper

Target: x86_64-linux-gnu

Configured with: ../gcc-9.2.0/configure
--prefix=/opt/compiler-explorer/gcc-build/staging --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu --disable-bootstrap
--enable-multiarch --with-abi=m64 --with-multilib-list=m32,m64,mx32
--enable-multilib --enable-clocale=gnu --enable-languages=c,c++,fortran,ada,d
--enable-ld=yes --enable-gold=yes --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --enable-linker-build-id --enable-lto
--enable-plugins --enable-threads=posix
--with-pkgversion=Compiler-Explorer-Build

Thread model: posix

gcc version 9.2.0 (Compiler-Explorer-Build) 

COLLECT_GCC_OPTIONS='-fdiagnostics-color=always' '-g' '-o' './output.s' '-v'
'-shared-libgcc' '-mtune=generic' '-march=x86-64'


/opt/compiler-explorer/gcc-9.2.0/bin/../libexec/gcc/x86_64-linux-gnu/9.2.0/cc1plus
-quiet -v -imultiarch x86_64-linux-gnu -iprefix
/opt/compiler-explorer/gcc-9.2.0/bin/../lib/gcc/x86_64-linux-gnu/9.2.0/
-D_GNU_SOURCE <source> -quiet -dumpbase example.cpp -mtune=generic
-march=x86-64 -auxbase example -g -version -fdiagnostics-color=always -o
/tmp/cc5PFAVP.s

GNU C++14 (Compiler-Explorer-Build) version 9.2.0 (x86_64-linux-gnu)

        compiled by GNU C version 7.4.0, GMP version 6.1.0, MPFR version 3.1.4,
MPC version 1.0.3, isl version isl-0.18-GMP



GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072

ignoring nonexistent directory
"/opt/compiler-explorer/gcc-9.2.0/bin/../lib/gcc/x86_64-linux-gnu/9.2.0/../../../../x86_64-linux-gnu/include"

ignoring duplicate directory
"/opt/compiler-explorer/gcc-9.2.0/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/9.2.0/../../../../include/c++/9.2.0"

ignoring duplicate directory
"/opt/compiler-explorer/gcc-9.2.0/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/9.2.0/../../../../include/c++/9.2.0/x86_64-linux-gnu"

ignoring duplicate directory
"/opt/compiler-explorer/gcc-9.2.0/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/9.2.0/../../../../include/c++/9.2.0/backward"

ignoring duplicate directory
"/opt/compiler-explorer/gcc-9.2.0/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/9.2.0/include"

ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"

ignoring duplicate directory
"/opt/compiler-explorer/gcc-9.2.0/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/9.2.0/include-fixed"

ignoring nonexistent directory
"/opt/compiler-explorer/gcc-9.2.0/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/9.2.0/../../../../x86_64-linux-gnu/include"

#include "..." search starts here:

#include <...> search starts here:


/opt/compiler-explorer/gcc-9.2.0/bin/../lib/gcc/x86_64-linux-gnu/9.2.0/../../../../include/c++/9.2.0


/opt/compiler-explorer/gcc-9.2.0/bin/../lib/gcc/x86_64-linux-gnu/9.2.0/../../../../include/c++/9.2.0/x86_64-linux-gnu


/opt/compiler-explorer/gcc-9.2.0/bin/../lib/gcc/x86_64-linux-gnu/9.2.0/../../../../include/c++/9.2.0/backward

 /opt/compiler-explorer/gcc-9.2.0/bin/../lib/gcc/x86_64-linux-gnu/9.2.0/include


/opt/compiler-explorer/gcc-9.2.0/bin/../lib/gcc/x86_64-linux-gnu/9.2.0/include-fixed

 /usr/local/include

 /opt/compiler-explorer/gcc-9.2.0/bin/../lib/gcc/../../include

 /usr/include/x86_64-linux-gnu

 /usr/include

End of search list.

GNU C++14 (Compiler-Explorer-Build) version 9.2.0 (x86_64-linux-gnu)

        compiled by GNU C version 7.4.0, GMP version 6.1.0, MPFR version 3.1.4,
MPC version 1.0.3, isl version isl-0.18-GMP



GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072

Compiler executable checksum: 35bcd684e0bc8b3378dcc1f162909bba

<source>: In function 'int main()':

<source>:7:34: error: invalid initialization of reference of type 'const
Container&' from expression of type 'int*'

    7 |     const Container& container = data;

      |                                  ^~~~

Execution build compiler returned: 1
>From gcc-bugs-return-665822-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 16 22:41:36 2020
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Subject: [Bug c++/93280] [10 Regression] ICE: in cp_gimplify_expr, at cp /cp-gimplify.c:933 since g:08f594eb399dab06
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93280

--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jason Merrill <jason@gcc.gnu.org>:

https://gcc.gnu.org/g:801f5b96775288e55193a66a746caab1ddd56f4a

commit r10-6024-g801f5b96775288e55193a66a746caab1ddd56f4a
Author: Jason Merrill <jason@redhat.com>
Date:   Thu Jan 16 10:46:40 2020 -0500

    PR c++/93280 - ICE with aggregate assignment and DMI.

    I recently added an assert to cp-gimplify to catch any
    TARGET_EXPR_DIRECT_INIT_P being expanded without a target object, and this
    testcase found one.  We started out with a TARGET_EXPR around the
    CONSTRUCTOR, which would normally mean that the member initializer would be
    used to directly initialize the appropriate member of whatever object the
    TARGET_EXPR ends up initializing.  But then gimplify_modify_expr_rhs
    stripped the TARGET_EXPR in order to assign directly from the elements of
    the CONSTRUCTOR, leaving no object for the TARGET_EXPR_DIRECT_INIT_P to
    initialize.  I considered setting CONSTRUCTOR_PLACEHOLDER_BOUNDARY in that
    case, which implies TARGET_EXPR_NO_ELIDE, but decided that there's no
    particular reason the A initializer needs to initialize a member of a B
    rather than a distinct A object, so let's only set
TARGET_EXPR_DIRECT_INIT_P
    when we're using the DMI in a constructor.

        * init.c (get_nsdmi): Set TARGET_EXPR_DIRECT_INIT_P here.
        * typeck2.c (digest_nsdmi_init): Not here.
>From gcc-bugs-return-665823-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 16 22:41:59 2020
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Subject: [Bug c++/93280] [10 Regression] ICE: in cp_gimplify_expr, at cp /cp-gimplify.c:933 since g:08f594eb399dab06
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93280

Jason Merrill <jason at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #6 from Jason Merrill <jason at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug lto/89358] [8 Regression] Combining -std=c++14 and -std=c++17 objects gives ODR warnings
Date: Thu, 16 Jan 2020 23:38:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89358

--- Comment #23 from Roger Orr <rogero at howzatt dot demon.co.uk> ---
That's good to hear -- thank you very much!
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Subject: [Bug c/92833] ice for broken C code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92833

--- Comment #7 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Joseph Myers <jsm28@gcc.gnu.org>:

https://gcc.gnu.org/g:852f0ae80555238c425e33f98df5c7077694bd9f

commit r10-6026-g852f0ae80555238c425e33f98df5c7077694bd9f
Author: Kerem Kat <keremkat@gmail.com>
Date:   Thu Jan 16 23:42:11 2020 +0000

    Fix ICE caused by swallowing a token in c_parser_consume_token

    This patch fixes ICE on invalid code, specifically files that have
    conflict-marker-like signs before EOF.

        PR c/92833
    gcc/c/
        * c-parser.c (c_parser_consume_token): Fix peeked token stack pop
        to support 4 available tokens.

    gcc/testsuite/
        * c-c++-common/pr92833-1.c, c-c++-common/pr92833-2.c,
        c-c++-common/pr92833-3.c, c-c++-common/pr92833-4.c: New tests.
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Subject: [Bug c/92833] ice for broken C code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92833

Joseph S. Myers <jsm28 at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED
   Target Milestone|---                         |10.0

--- Comment #8 from Joseph S. Myers <jsm28 at gcc dot gnu.org> ---
Fix committed, thanks.
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Subject: [Bug analyzer/93291] 'FAIL: gcc.dg/analyzer/pattern-test-2.c' for a few configurations
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93291

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to David Malcolm from comment #1) 
> I'm not sure where the difference between the targets originates; is there a
> way to force the usage of bitwise-or here?

Try to write it this way:

bool tmp1 = p == 0B;
bool tmp2 = q == 0B
bool tmp = tmp1 | tmp2;
if (tmp)
....
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Subject: [Bug c++/93297] New: internal compiler error: in set_constraints, at cp/constraint.cc:
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93297

            Bug ID: 93297
           Summary: internal compiler error: in set_constraints, at
                    cp/constraint.cc:
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Keywords: ice-checking, ice-on-invalid-code, ice-on-valid-code
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  Target Milestone: ---

sha1.cc: In function â€˜int main()â€™:
sha1.cc:7:90: internal compiler error: in set_constraints, at
cp/constraint.cc:1176
    7 |  fast_io::osha
s(std::piecewise_construct,std::forward_as_tuple(),std::forward_as_tuple());
      |                                                                        
                 ^
0x658b55 set_constraints(tree_node*, tree_node*)
        ../../gcc/gcc/cp/constraint.cc:1176
0xa23457 alias_ctad_tweaks
        ../../gcc/gcc/cp/pt.c:28284
0xa23457 deduction_guides_for
        ../../gcc/gcc/cp/pt.c:28395
0xa2377b do_class_deduction
        ../../gcc/gcc/cp/pt.c:28500
0xa2377b do_auto_deduction(tree_node*, tree_node*, tree_node*, int,
auto_deduction_context, tree_node*, int)
        ../../gcc/gcc/cp/pt.c:28629
0x9584ec cp_finish_decl(tree_node*, tree_node*, bool, tree_node*, int)
        ../../gcc/gcc/cp/decl.c:7463
0x9fe844 cp_parser_init_declarator
        ../../gcc/gcc/cp/parser.c:20768
0x9e07c2 cp_parser_simple_declaration
        ../../gcc/gcc/cp/parser.c:13629
0x9e251a cp_parser_declaration_statement
        ../../gcc/gcc/cp/parser.c:13061
0x9e30b7 cp_parser_statement
        ../../gcc/gcc/cp/parser.c:11383
0x9e4098 cp_parser_statement_seq_opt
        ../../gcc/gcc/cp/parser.c:11745
0x9e4178 cp_parser_compound_statement
        ../../gcc/gcc/cp/parser.c:11699
0x9fab65 cp_parser_function_body
        ../../gcc/gcc/cp/parser.c:22907
0x9fab65 cp_parser_ctor_initializer_opt_and_function_body
        ../../gcc/gcc/cp/parser.c:22958
0x9fde3d cp_parser_function_definition_after_declarator
        ../../gcc/gcc/cp/parser.c:28745
0x9fee46 cp_parser_function_definition_from_specifiers_and_declarator
        ../../gcc/gcc/cp/parser.c:28661
0x9fee46 cp_parser_init_declarator
        ../../gcc/gcc/cp/parser.c:20536
0x9e07c2 cp_parser_simple_declaration
        ../../gcc/gcc/cp/parser.c:13629
0xa091a2 cp_parser_declaration
        ../../gcc/gcc/cp/parser.c:13328
0xa0991a cp_parser_translation_unit
        ../../gcc/gcc/cp/parser.c:4723
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.


on windows MinGW-w64
sha1.cc: In function 'int main()':
sha1.cc:7:90: internal compiler error: in set_constraints, at
cp/constraint.cc:1177
    7 |  fast_io::osha
s(std::piecewise_construct,std::forward_as_tuple(),std::forward_as_tuple());
      |                                                                        
                 ^
libbacktrace could not find executable to open
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc-mcf.lhmouse.com/> for instructions.
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Subject: [Bug c++/93297] internal compiler error: in set_constraints, at cp/constraint.cc:
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fdlbxtqi <euloanty at live dot com> changed:

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----------------------------------------------------------------------------
                 CC|                            |euloanty at live dot com

--- Comment #1 from fdlbxtqi <euloanty at live dot com> ---
Created attachment 47662
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47662&action=edit
preprocessed file
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Subject: [Bug target/93119] [ICE] The traditional TLS support of aarch64-ilp32 target may be not perfect while enable fPIC
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--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Created attachment 47663
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47663&action=edit
Patch which fixes the problem

So we need to accept P modes and not PTR modes for the aarch64_valid_symref. 
And then we need to also change the mode of the result to be always Pmode
(DImode).
And then we need to take the lower part of the result.

Oh also instead of checking if we are targetting ILP32, we need to check the
type of imm and such.
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Subject: [Bug target/93119] [ICE] The traditional TLS support of aarch64-ilp32 target may be not perfect while enable fPIC
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93119

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #5)
> Created attachment 47663 [details]
> Patch which fixes the problem
> 
> So we need to accept P modes and not PTR modes for the aarch64_valid_symref.
> And then we need to also change the mode of the result to be always Pmode
> (DImode).
> And then we need to take the lower part of the result.
> 
> Oh also instead of checking if we are targetting ILP32, we need to check the
> type of imm and such.

I will submit this patch after a build/test but I made sure both testcases
don't fail any more.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93286

--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jason Merrill <jason@gcc.gnu.org>:

https://gcc.gnu.org/g:5194b51ed9714808d88827531e91474895b6c706

commit r10-6029-g5194b51ed9714808d88827531e91474895b6c706
Author: Jason Merrill <jason@redhat.com>
Date:   Thu Jan 16 16:55:39 2020 -0500

    PR c++/93286 - ICE with __is_constructible and variadic template.

    Here we had been recursing in tsubst_copy_and_build if type2 was a
TREE_LIST
    because that function knew how to deal with pack expansions, and tsubst
    didn't.  But tsubst_copy_and_build expects to be dealing with expressions,
    so we crash when trying to convert_from_reference a type.

        * pt.c (tsubst) [TREE_LIST]: Handle pack expansion.
        (tsubst_copy_and_build) [TRAIT_EXPR]: Always use tsubst for type2.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93286

Jason Merrill <jason at gcc dot gnu.org> changed:

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----------------------------------------------------------------------------
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         Resolution|---                         |FIXED

--- Comment #4 from Jason Merrill <jason at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug middle-end/93298] New: GCC 10.0 non-current union member access
Date: Fri, 17 Jan 2020 04:49:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93298

            Bug ID: 93298
           Summary: GCC 10.0 non-current union member access
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
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  Target Milestone: ---

I'm not sure whether this test program is valid, but here it is:

$ cat test-case.c 
extern int printf(const char *, ...);

union {
        unsigned int m1;
        unsigned short int m2;
} a;
unsigned int *const b = &a.m1;
unsigned short *c = &a.m2;

int main() {
        int i;
        for(i = 0; i < 5; i++) {
                *b = 0;
                (*c)++;
        }
        printf("%u\n", a.m1);
        printf("%hu\n", a.m2);
        return 0;
}
$ gcc-10-20200110 -v
Using built-in specs.
COLLECT_GCC=gcc-10-20200110
COLLECT_LTO_WRAPPER=/opt/gcc-10-20200110/bin/../lib/gcc/x86_64-unknown-freebsd11/10.0.0/lto-wrapper
Target: x86_64-unknown-freebsd11
Configured with: ../gcc-10-20200110/configure --build=x86_64-unknown-freebsd11
--prefix=/usr/local --sysconfdir=/etc --localstatedir=/var
--libexecdir='/usr/local/lib' --enable-version-specific-runtime-libs
--disable-rpath --with-system-zlib
--enable-languages=c,c++,objc,obj-c++,fortran,lto --enable-plugin
--enable-initfini-array --enable-gnu-indirect-function
--program-suffix=-10-20200110
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 10.0.0 20200110 (experimental) (GCC) 
$ gcc-10-20200110 -Wall -Wextra -O2 test-case.c 
$ ./a.out 
0
5
$ gcc-10-20200110 -Wall -Wextra -O1 test-case.c
$ ./a.out
1
1


I has been read C90 and C99 for information of reading non-current member in an
union; it seems the value would be 'unspecified' by the C99.
While C90 says:
> if a member of a union object is accessed after a value has been stored in a different member of the object, the behavior is implementation-defined.

I tried to use C90 mode to compile the program, but got same result:

$ gcc-10-20200110 -Wall -Wextra -std=c90 -O2 test-case.c
$ ./a.out
0
5
$ gcc-10-20200110 -Wall -Wextra -std=c90 -O1 test-case.c
$ ./a.out
1
1
$ gcc-10-20200110 -Wall -Wextra -std=c90 -Os test-case.c
$ ./a.out
0
5
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:

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--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
>I'm not sure whether this test program is valid

You are not accessing via the union but rather via a short or an int.

BUT it is a dup of bug 57359.

*** This bug has been marked as a duplicate of bug 57359 ***
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Subject: [Bug tree-optimization/57359] store motion causes wrong code for union access at -O3
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:

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----------------------------------------------------------------------------
                 CC|                            |msl0000023508 at gmail dot com

--- Comment #18 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
*** Bug 93298 has been marked as a duplicate of this bug. ***
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57359

--- Comment #19 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #14)
> Testcase from PR81028
> 
> extern void abort();
> 
> typedef int A;
> typedef float B;
> 
> void __attribute__((noinline,noclone))
> foo(A *p, B *q, long unk)
> {
>   for (long i = 0; i < unk; ++i) {
>       *p = 1;
>       q[i] = 42;
>   }
> }
> 

I don't see how the above function cannot be optimized to what we currently
optimize it to?  The C/C++ aliasing rules say p and q cannot be a related
pointer at all.

In the inplacement new case, there is another issue going on.  Locals and
changing types was a defect report against C++ (or at least I thought I saw
one).
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Subject: [Bug tree-optimization/92980] [miss optimization]redundant load missed by fre.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92980

--- Comment #11 from Hongyu Wang <wwwhhhyyy333 at gmail dot com> ---
(In reply to rguenther@suse.de from comment #10)
> 
> It has two exits which makes it difficult
> Or impossible to make it truly do-while.
> But it's close enough and further rotating the loop doesn't make it better.

Thanks for the explanation. But the original loop without eliminating the
parser code is:

 <bb 2> [local count: 114863532]:
 goto <bb 5>; [100.00%]

 <bb 3> [local count: 1014686025]:
 i.0_1 = (unsigned int) i_10;
 _2 = i.0_1 * 4;
 _3 = a_13(D) + _2;
 _4 = *_3;
 _5 = i.0_1 + 1;
 _6 = _5 * 4;
 _7 = a_13(D) + _6;
 _8 = *_7;
 if (_4 > _8)
   goto <bb 6>; [5.50%]
 else
   goto <bb 4>; [94.50%]

 <bb 4> [local count: 958878293]:
 i_15 = i_10 + 1;

 <bb 5> [local count: 1073741824]:
 # i_10 = PHI <0(2), i_15(4)>
 _9 = n_12(D) + -1;
 if (_9 > i_10)
   goto <bb 3>; [94.50%]
 else
   goto <bb 6>; [5.50%]

 <bb 6> [local count: 114863532]:
 # _11 = PHI <0(3), 1(5)>
 return _11;

This is considered as not a do-while loop since the latch (bb 4) is not empty,
and it is successfully rotated. I don't think there is much difference except
i_15 = i_10 + 1 which can be optimized by fre after the parser change. 

So I wonder if the original one is rotated, why the one with empty latch can't.
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Subject: [Bug tree-optimization/57359] store motion causes wrong code for union access at -O3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57359

--- Comment #20 from rguenther at suse dot de <rguenther at suse dot de> ---
On Fri, 17 Jan 2020, pinskia at gcc dot gnu.org wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57359
> 
> --- Comment #19 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
> (In reply to Richard Biener from comment #14)
> > Testcase from PR81028
> > 
> > extern void abort();
> > 
> > typedef int A;
> > typedef float B;
> > 
> > void __attribute__((noinline,noclone))
> > foo(A *p, B *q, long unk)
> > {
> >   for (long i = 0; i < unk; ++i) {
> >       *p = 1;
> >       q[i] = 42;
> >   }
> > }
> > 
> 
> I don't see how the above function cannot be optimized to what we currently
> optimize it to?  The C/C++ aliasing rules say p and q cannot be a related
> pointer at all.
> 
> In the inplacement new case, there is another issue going on.  Locals and
> changing types was a defect report against C++ (or at least I thought I saw
> one).

This is about "placement new" or rather the middle-end memory model.
You can also simply make p/q point to different union members of the
same union where then the above is still valid with unk == 0 but we
mess it up, re-ordering the stores (basically we say the stores don't
conflict which is not correct for WAW or WAR dependences)
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Subject: [Bug tree-optimization/92980] [miss optimization]redundant load missed by fre.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92980

--- Comment #12 from Richard Biener <rguenth at gcc dot gnu.org> ---
Ah, sorry I failed to see the entry from BB2 isn't fallthru.  I agree the
difference is spurious in this particular case but in general it's quite hard
to do better without excessively rotating most multi-exit loops.  Note in
the end you also have to satisfy should_duplicate_loop_header_p for each
block to duplicate.

So what is suprious here is that we do not consider

 do
   {
   }
 while (i++ < n);

to be a do-while loop but we do for

 do
   {
   }
 while (++i < n);

due to the IV update in the latch.  IMHO technically that's correct.

The loop in question does not look like a do-while loop to us because
the loop header doesn't contain "most" of the loop body.  But CFG wise
it perfectly satisfies the predicate.

I think the new FAILs are somewhat spurious and one would need to investigate
on a case-by-case basis whether they really are a regression.  Often
they are testcases for specific input IL (which you changed) rather than
a specific C testcase.
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Subject: [Bug target/93119] [ICE] The traditional TLS support of aarch64-ilp32 target may be not perfect while enable fPIC
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93119

--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
So looking further, my patch is incorrect.

The glibc sources for __tls_get_addr says it returns void* which is a 32bit
value which might or might not be zero extended.
So I need to fix this slightly different from what I did.

>These are supposed to be machine addresses, not C pointers.
Yes and no but see above, even my attached patch is wrong.  I am rewriting this
again.
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Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2020-01-17
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--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Please provide the compiler command-line you are using, append -v and provide
the generated output.
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Subject: [Bug c++/93279] [9/10 Regression] C++ Template substitution ICE
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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----------------------------------------------------------------------------
           Priority|P3                          |P2
      Known to work|                            |8.3.0
            Version|unknown                     |9.2.0
   Target Milestone|---                         |9.3
            Summary|[9 Regression] C++ Template |[9/10 Regression] C++
                   |substitution ICE            |Template substitution ICE
      Known to fail|                            |10.0, 9.2.0
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Subject: [Bug testsuite/93294] [10 Regression] Addition of -fdiagnostic-urls=never to testsuite flags broke compat.exp testing with ALT_CC_UNDER_TEST=gcc etc.
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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Richard Biener <rguenth at gcc dot gnu.org> changed:

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----------------------------------------------------------------------------
         Resolution|DUPLICATE                   |INVALID

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
I'd say it's not a dup but INVALID since you are reading the non-active union
member a.m1 after the loop which ends in activating a.m2.  GCCs type punning
via union doesn't apply because you use pointer accesses as Andrew says.  He
also
points to a related (and valid) bugreport though.
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:

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----------------------------------------------------------------------------
  Attachment #47663|0                           |1
        is obsolete|                            |

--- Comment #8 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Created attachment 47664
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47664&action=edit
New patch

New patch which does what I describe.  I am sill need to test it.  It corrects
the issue I mentioned about zero_extending the result of the function call.
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Subject: [Bug c++/93299] New: [9/10 Regression] ICE in tsubst_copy, at cp/pt.c:15779
Date: Fri, 17 Jan 2020 08:31:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93299

            Bug ID: 93299
           Summary: [9/10 Regression] ICE in tsubst_copy, at cp/pt.c:15779
           Product: gcc
           Version: 9.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: doko at debian dot org
  Target Milestone: ---

[forwarded from https://bugs.debian.org/949024]

seen with gcc-9 branch 20200110 and trunk:

$ cat foo.ii
template <typename> struct a {
  enum { b };
};
class c;
template <int> class __attribute__((aligned((a<c>::b)))) d {};
class : d<0> {

$ g++ -c -std=gnu++14 foo.ii 
foo.ii: In instantiation of 'class d<0>':
foo.ii:6:9:   required from here
foo.ii:5:58: internal compiler error: in tsubst_copy, at cp/pt.c:15779
    5 | template <int> class __attribute__((aligned((a<c>::b)))) d {};
      |                                                          ^
0x7f3dbc75bbba __libc_start_main
        ../csu/libc-start.c:308
Please submit a full bug report,
with preprocessed source if appropriate.
>From gcc-bugs-return-665848-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 17 08:34:48 2020
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Subject: [Bug testsuite/93294] [10 Regression] Addition of -fdiagnostic-urls=never to testsuite flags broke compat.exp testing with ALT_CC_UNDER_TEST=gcc etc.
Date: Fri, 17 Jan 2020 08:34:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93294

--- Comment #1 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jakub Jelinek <jakub@gcc.gnu.org>:

https://gcc.gnu.org/g:40111910b0aa897b3e4c8d60c0c263e5c1a50446

commit r10-6032-g40111910b0aa897b3e4c8d60c0c263e5c1a50446
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Fri Jan 17 09:30:17 2020 +0100

    testsuite: Unbreak compat.exp testing with alt compiler PR93294

    2020-01-17  Jakub Jelinek  <jakub@redhat.com>

        PR testsuite/93294
        * lib/c-compat.exp (compat-use-alt-compiler): Handle
        -fdiagnostics-urls=never similarly to -fdiagnostics-color=never.
        (compat_setup_dfp): Likewise.
>From gcc-bugs-return-665849-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 17 08:39:58 2020
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/93300] New: ICE in convert_mode_scalar, at expr.c:325
Date: Fri, 17 Jan 2020 08:39:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93300

            Bug ID: 93300
           Summary: ICE in convert_mode_scalar, at expr.c:325
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: target
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          Reporter: marxin at gcc dot gnu.org
  Target Milestone: ---
              Host: x86_64-linux-gnu
            Target: arm-linux-gnueabi

I see the following ICE:

$ arm-linux-gnueabi-gcc
/home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/torture/floatn-convert.c
-mfp16-format=ieee
during RTL pass: expand
/home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/torture/floatn-convert.c: In
function â€˜mainâ€™:
/home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/torture/floatn-convert.c:94:1:
internal compiler error: in convert_mode_scalar, at expr.c:325
   94 | main (void)
      | ^~~~
0x59db33 convert_mode_scalar
       
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-arm/build/gcc/expr.c:325
0x59db33 convert_move(rtx_def*, rtx_def*, int)
       
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-arm/build/gcc/expr.c:297
0x7d0fb0 convert_modes(machine_mode, machine_mode, rtx_def*, int)
       
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-arm/build/gcc/expr.c:737
0x9cb221 prepare_float_lib_cmp
       
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-arm/build/gcc/optabs.c:4227
0x9cb221 prepare_cmp_insn
       
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-arm/build/gcc/optabs.c:4022
0x9cbabe emit_cmp_and_jump_insns(rtx_def*, rtx_def*, rtx_code, rtx_def*,
machine_mode, int, rtx_def*, profile_probability)
       
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-arm/build/gcc/optabs.c:4176
0x7438d1 do_compare_rtx_and_jump(rtx_def*, rtx_def*, rtx_code, int,
machine_mode, rtx_def*, rtx_code_label*, rtx_code_label*, profile_probability)
       
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-arm/build/gcc/dojump.c:1169
0x744b81 do_compare_and_jump
       
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-arm/build/gcc/dojump.c:1243
0x745ab6 do_jump_1
       
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-arm/build/gcc/dojump.c:219
0x6e4a3e expand_gimple_cond
       
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-arm/build/gcc/cfgexpand.c:2517
0x6e4a3e expand_gimple_basic_block
       
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-arm/build/gcc/cfgexpand.c:5739
0x6e5c96 execute
       
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-arm/build/gcc/cfgexpand.c:6539
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
>From gcc-bugs-return-665850-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 17 08:41:45 2020
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Subject: [Bug tree-optimization/93292] [10 Regression] ICE (segfault) in vectorizable_comparison on powerpc64le-linux-gnu since r10-5071
Date: Fri, 17 Jan 2020 08:41:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93292

--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jakub Jelinek <jakub@gcc.gnu.org>:

https://gcc.gnu.org/g:dc9ba9d045d0cfc06207806fd64b06ab3304b196

commit r10-6033-gdc9ba9d045d0cfc06207806fd64b06ab3304b196
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Fri Jan 17 09:39:45 2020 +0100

    vect: Fix ICE in vectorizable_comparison PR93292

    The following testcase ICEs on powerpc64le-linux.  The problem is that
    get_vectype_for_scalar_type returns NULL, and while most places in
    tree-vect-stmts.c handle that case, this spot doesn't and punts only
    if it is non-NULL, but with different number of elts than expected.

    2020-01-17  Jakub Jelinek  <jakub@redhat.com>

        PR tree-optimization/93292
        * tree-vect-stmts.c (vectorizable_comparison): Punt also if
        get_vectype_for_scalar_type returns NULL.

        * g++.dg/opt/pr93292.C: New test.
>From gcc-bugs-return-665852-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 17 08:42:43 2020
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Subject: [Bug tree-optimization/93292] [10 Regression] ICE (segfault) in vectorizable_comparison on powerpc64le-linux-gnu since r10-5071
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93292

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed.
>From gcc-bugs-return-665851-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 17 08:42:18 2020
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug testsuite/93294] [10 Regression] Addition of -fdiagnostic-urls=never to testsuite flags broke compat.exp testing with ALT_CC_UNDER_TEST=gcc etc.
Date: Fri, 17 Jan 2020 08:42:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93294

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed.
>From gcc-bugs-return-665853-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 17 08:44:31 2020
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Subject: [Bug c++/93299] [9/10 Regression] ICE in tsubst_copy, at cp/pt.c:15779
Date: Fri, 17 Jan 2020 08:44:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93299

Martin LiÅ¡ka <marxin at gcc dot gnu.org> changed:

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     Ever confirmed|0                           |1

--- Comment #1 from Martin LiÅ¡ka <marxin at gcc dot gnu.org> ---
Thanks for report. But is it a valid code snippet? Is there a release of clang
or GCC that accepts that?
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Subject: [Bug c++/93297] internal compiler error: in set_constraints, at cp/constraint.cc:
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93297

Martin LiÅ¡ka <marxin at gcc dot gnu.org> changed:

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     Ever confirmed|0                           |1

--- Comment #2 from Martin LiÅ¡ka <marxin at gcc dot gnu.org> ---
Thanks for the report. Can you please send us the command line used for the
compilation? Ideally output of -v option.
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Subject: [Bug tree-optimization/93301] New: Wrong optimization: instability of uninitialized variables leads to nonsense
Date: Fri, 17 Jan 2020 08:47:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93301

            Bug ID: 93301
           Summary: Wrong optimization: instability of uninitialized
                    variables leads to nonsense
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
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          Reporter: ch3root at openwall dot com
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Instability is inconsistency, which leads to logical contradictions, which
leads to total chaos. Similar to bug 61502, comment 42, but with uninitialized
variables:

----------------------------------------------------------------------
#include <stdio.h>

__attribute__((noipa)) // imagine it in a separate TU
static void *opaque(void *p) { return p; }

int main()
{
    int c = 1;
    opaque(&c);

    unsigned char x = 0;
    opaque(&x);
    unsigned char y; // no trap representation possible
    (void)&y; // disarm C11, 6.3.2.1p2

    unsigned char z;
    int b;
    if (x == y) {
        b = 1;
        z = x;
    } else {
        b = 0;
        z = y;
    }

    opaque(&b);
    if (b)
        printf("b = %d  c = %d  x = %d  e = %d\n", b, c, x, c ? z : 5);
}
----------------------------------------------------------------------
$ gcc -std=c11 -O3 test.c && ./a.out
b = 1  c = 1  x = 0  e = 5
----------------------------------------------------------------------
gcc x86-64 version: gcc (GCC) 10.0.1 20200117 (experimental)
----------------------------------------------------------------------

Given that the printf has fired, `b` is `1`, hence `z` is the same as `x` and
`e = 0` should be printed.

According to my reading of C11 this program doesn't invoke UB. (And I thought
that most proposals about "wobbly" values wouldn't change this but I'm not sure
anymore:-)

Even if this particular example is deemed undefined by gcc, I guess
inconsistencies could blow everything up even without any help from a
programmer.

clang bug -- https://bugs.llvm.org/show_bug.cgi?id=44512.
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Martin LiÅ¡ka <marxin at gcc dot gnu.org> changed:

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Subject: [Bug rtl-optimization/93303] New: [10 Regression] ICE in lra_constraints.c4948 on aarch64-linux-gnu
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93303

            Bug ID: 93303
           Summary: [10 Regression] ICE in lra_constraints.c4948 on
                    aarch64-linux-gnu
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
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Created attachment 47666
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47666&action=edit
test case

seen with trunk 20200116 on aarch64-linux-gnu:

$ g++ -c -O2 -std=gnu++11 -fstack-protector-strong -fasynchronous-unwind-tables
-fstack-protector-strong test.ii 
during RTL pass: reload
: In function 'void dh(dd, dg, cz, av<const int, as>, av<const int, at>, de,
df, int, int, int, int, int, int, int) [with <template-parameter-1-1> = ae; bz
= bp<int, 8, 4>; dd = int; de = aw<int, as>; df = aw<int, at>; dg = cy; cz =
ao<int, am>]':
:158:1: internal compiler error: maximum number of generated reload insns per
insn achieved (90)
0xadc5d7 lra_constraints(bool)
        ../../src/gcc/lra-constraints.c:4948
0xac6977 lra(_IO_FILE*)
        ../../src/gcc/lra.c:2437
0xa85887 do_reload
        ../../src/gcc/ira.c:5526
0xa85887 execute
        ../../src/gcc/ira.c:5712
Please submit a full bug report,
with preprocessed source if appropriate.
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Subject: [Bug c/93302] New: -O2 -fno-inline produces wrong results
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93302

            Bug ID: 93302
           Summary: -O2 -fno-inline produces wrong results
           Product: gcc
           Version: 9.2.0
            Status: UNCONFIRMED
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Created attachment 47665
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47665&action=edit
preprocessed file

I am code to do tcp checksum and find that output binary doesn't work as
expected with compilation option -O2 -fno-inline.
Partial source code is uploaded as an attachment and it seems to work with any
compilation options but -O2 -fno-inline.

Test Env:
gcc 9.2.0 (Arch Linux)
gcc 5.3.0 (Ubuntu 16.04)

Expected output:
12345678 87654321 40 12
5678 5678
1234 68ac
4321 abcd
8765 13332
600 13932
2800 16132

I disassemble the output binary and find that the instructions to store saddr
and daddr to stack memory are optimized out so hdr's first two members stay
uninitialized.
If a memory barrier 'asm volatile("": : :"memory");' is put before access
'hdr', gcc could get it right.

Env Info:

GCC VERSION:
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /build/gcc/src/gcc/configure --prefix=/usr --libdir=/usr/lib
--libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info
--with-bugurl=https://bugs.archlinux.org/
--enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++,d --enable-shared
--enable-threads=posix --with-system-zlib --with-isl --enable-__cxa_atexit
--disable-libunwind-exceptions --enable-clocale=gnu --disable-libstdcxx-pch
--disable-libssp --enable-gnu-unique-object --enable-linker-build-id
--enable-lto --enable-plugin --enable-install-libiberty
--with-linker-hash-style=gnu --enable-gnu-indirect-function --enable-multilib
--disable-werror --enable-checking=release --enable-default-pie
--enable-default-ssp --enable-cet=auto gdc_include_dir=/usr/include/dlang/gdc
Thread model: posix
gcc version 9.2.0 (GCC)

BUG COMMAND:
$ gcc test3.c -O2 -fno-inline

COMPILER OUTPUT:
NOTHING

OS:
$ cat /etc/issue 
Arch Linux \r (\l)

PREP FILE:
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Subject: [Bug rtl-optimization/93303] [10 Regression] ICE in lra_constraints.c4948 on aarch64-linux-gnu
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--- Comment #1 from Matthias Klose <doko at ubuntu dot com> ---
Created attachment 47667
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47667&action=edit
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Subject: [Bug tree-optimization/93271] [8/9/10 regression] SRA producing wrong code on denormals
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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Subject: [Bug fortran/92779] [8/9/10 Regression] ICE in gfc_conv_intrinsic_funcall, at fortran/trans-intrinsic.c:4225
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Subject: [Bug tree-optimization/80635] [8/9/10 regression] std::optional and bogus -Wmaybe-uninitialized warning
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Subject: [Bug ipa/92606] [8/9/10 Regression][avr] invalid merge of symbols in progmem and data sections
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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Subject: [Bug rtl-optimization/93303] [10 Regression] ICE in lra_constraints.c4948 on aarch64-linux-gnu
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Subject: [Bug c++/93299] [9/10 Regression] ICE in tsubst_copy, at cp/pt.c:15779
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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Subject: [Bug d/92792] [10 Regression] symbols dropped from libphobos
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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Subject: [Bug fortran/93263] [9/10 Regression] -fno-automatic and RECURSIVE
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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Richard Biener <rguenth at gcc dot gnu.org> changed:

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Subject: [Bug tree-optimization/80635] [8/9/10 regression] std::optional and bogus -Wmaybe-uninitialized warning
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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Andrew Pinski <pinskia at gcc dot gnu.org> changed:

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--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Use either -fno-strict-aliasing, memcpy or an union to fix the aliasing issue
in your code.

You wrote hdr as a struct psuedo_hdr but reading it as an uint16_t, only the
field length can be read as an uint16_t .
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Subject: [Bug target/84490] [8/9/10 regression] 436.cactusADM regressed by 6-8% percent with -Ofast on Zen and Haswell, compared to gcc 7.2
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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--- Comment #12 from Richard Biener <rguenth at gcc dot gnu.org> ---
Wonder if we can have an update on this?
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Subject: [Bug target/88494] [9/10 Regression] polyhedron 10% mdbx runtime regression
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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Subject: [Bug rtl-optimization/93303] [10 Regression] ICE in lra_constraints.c4948 on aarch64-linux-gnu
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:

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         Depends on|                            |93221

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Most likely a dup of bug 93221.


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93221
[Bug 93221] [10 Regression] ICE maximum number of generated reload insns per
insn achieved (90) on aarch64
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Subject: [Bug c/88660] [8/9/10 Regression] Invalid report of "set but used variable" with -O
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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Richard Biener <rguenth at gcc dot gnu.org> changed:

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Subject: [Bug ipa/89584] [9/10 Regression] CPU2000 degradations with r268448 (172.mgrid -22%, 252.eon -8%)
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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Subject: [Bug target/90204] [8/9/10 Regression] C code is optimized worse than C++
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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Subject: [Bug c++/90333] [9/10 Regression] Can't apply attributes to lambdas with trailing returns
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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Subject: [Bug libstdc++/90415] [9/10 Regression] std::is_copy_constructible<std::tuple<std::any>> is incomplete
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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Richard Biener <rguenth at gcc dot gnu.org> changed:

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Subject: [Bug testsuite/90565] [10 regression] test cases gcc.dg/uninit-18.c and uninit-pr90394-1-gimple.c broken as of r271460
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Subject: [Bug tree-optimization/90579] [8/9/10 Regression] Huge store forward stall due to vectorizer, missed CSE
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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----------------------------------------------------------------------------
           Priority|P3                          |P2
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot gnu.org
            Summary|[8/9/10 Regression] Huge    |[8/9/10 Regression] Huge
                   |store forward stall due to  |store forward stall due to
                   |vectorizer                  |vectorizer, missed CSE

--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
So we now have a "real" FRE after the vectorizer but we fail to CSE

  MEM <vector(4) double> [(double *)&r] = vect__3.20_74;
...
  MEM <vector(2) double> [(double *)&r + 32B] = vect__62.26_88;
...
  vect__5.7_34 = MEM <vector(4) double> [(double *)&r + 16B];

mine for GCC 11 to look at.  The code to CSE that load for _74 and _88
is going to be a bit awkward though but it will nicely combine with the
following stmts

  vect__5.8_35 = VEC_PERM_EXPR <vect__5.7_34, vect__5.7_34, { 3, 2, 1, 0 }>;
  stmp_t_12.9_36 = BIT_FIELD_REF <vect__5.8_35, 64, 0>;
  stmp_t_12.9_37 = stmp_t_12.9_36 + 0.0;
  stmp_t_12.9_38 = BIT_FIELD_REF <vect__5.8_35, 64, 64>;
  stmp_t_12.9_39 = stmp_t_12.9_37 + stmp_t_12.9_38;
  stmp_t_12.9_40 = BIT_FIELD_REF <vect__5.8_35, 64, 128>;
  stmp_t_12.9_41 = stmp_t_12.9_39 + stmp_t_12.9_40;
  stmp_t_12.9_42 = BIT_FIELD_REF <vect__5.8_35, 64, 192>;
  t_12 = stmp_t_12.9_41 + stmp_t_12.9_42;

and hopefully elide 'r' completely.
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Subject: [Bug tree-optimization/90594] [9/10 regression] Spurious popcount emitted
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91123

Richard Biener <rguenth at gcc dot gnu.org> changed:

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Subject: [Bug tree-optimization/91144] [10 regression] 176.gcc miscompare after r273294
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91144

Richard Biener <rguenth at gcc dot gnu.org> changed:

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--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Invalid.
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Subject: [Bug middle-end/26163] [meta-bug] missed optimization in SPEC (2k17, 2k and 2k6 and 95)
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=26163
Bug 26163 depends on bug 91144, which changed state.

Bug 91144 Summary: [10 regression] 176.gcc miscompare after r273294
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91144

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Subject: [Bug middle-end/85559] [meta-bug] Improve conditional move
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85559
Bug 85559 depends on bug 91154, which changed state.

Bug 91154 Summary: [10 Regression] 456.hmmer regression on Haswell caused by r272922
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91154

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>From gcc-bugs-return-665893-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 17 09:50:41 2020
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Subject: [Bug rtl-optimization/91154] [10 Regression] 456.hmmer regression on Haswell caused by r272922
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91154

Richard Biener <rguenth at gcc dot gnu.org> changed:

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--- Comment #39 from Richard Biener <rguenth at gcc dot gnu.org> ---
So this bug turned into a mess of random benchmarks.  The 456.hmmer regression
is fixed.

Please open new bugs for any other things found.  cactusADM jumps up and down
on my tester and shows no clear regression.
>From gcc-bugs-return-665894-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 17 09:50:43 2020
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=26163
Bug 26163 depends on bug 91154, which changed state.

Bug 91154 Summary: [10 Regression] 456.hmmer regression on Haswell caused by r272922
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91154

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Subject: [Bug target/91052] [10 Regression] ICE in fix_reg_equiv_init, at ira.c:2705
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91052

--- Comment #7 from Martin LiÅ¡ka <marxin at gcc dot gnu.org> ---
@Kewen: Can you please take a look?
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Subject: [Bug tree-optimization/67153] [8/9/10 Regression] integer optimizations 53% slower than std::bitset<>
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67153

--- Comment #29 from ncm at cantrip dot org ---
> My reason for thinking this is not a bug is that the fastest choice will
> depend on the contents of the word list.   Regardless of layout, there will
> be one option that is slightly faster than the other.   I guess it's
> reasonable to ask, though, whether it's better by default to try to save one
> cycle on an already very fast empty loop, or to save one cycle on a more
> expensive loop. But the real gain (if there is one) will be matching the
> layout to the runtime behavior, for which the compiler requires outside
> information.

Saving one cycle on a two-cycle loop has a possibility of a much larger effect
than saving one cycle of a fifty-cycle loop. Even if the fifty-cycle loop is
the norm, an extra cycle costs only 2%, but if the two-cycle loop is the more
common, as in this case, saving the one cycle is a big win.
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Subject: [Bug c++/91217] [8/9/10 Regression] Returning std::array from lambda results in an extra copy step on return
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91217

Richard Biener <rguenth at gcc dot gnu.org> changed:

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Subject: [Bug rtl-optimization/91333] [9/10 Regression] suboptimal register allocation for inline asm
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Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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           Priority|P3                          |P2
      Known to work|                            |8.3.1
      Known to fail|                            |9.2.1

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
I can confirm this on the GCC 9 branch but trunk is fine apart from at -O1. 
Maybe tuning/default arch affects this (didn't check, I use x86-64 and
generic).
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Subject: [Bug c++/91377] [8/9/10 Regression] ICE with non-static block scope constexpr, captured in lambda, used as template parameter
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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Subject: [Bug c++/91465] [9/10 Regression] unexpected expression of kind overload  (ICE)
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Subject: [Bug c++/91706] [8/9/10 Regression] ICE: tree check: expected class 'type', have 'exceptional' (error_mark) in equate_type_number_to_die, at dwarf2out.c:5782
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Subject: [Bug c++/92804] [10 Regression] ICE trying to use concept as a nested-name-specifier
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Paolo Carlini <paolo.carlini at oracle dot com> changed:

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--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Confirmed.
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Subject: [Bug middle-end/91708] [10 regression][ARM] Bootstrap fails in gen_movsi, at config/arm/arm.md:5258
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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--- Comment #23 from Richard Biener <rguenth at gcc dot gnu.org> ---
The bootstrap issue is fixed.  The wrong-code issue is older, if people want to
pursue backports please open a separate issue tracking that.
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--- Comment #8 from Kewen Lin <linkw at gcc dot gnu.org> ---
Sorry, I just saw this bug was starting to fail with my commit. Thanks for @ing
me! My commit is just to pass the finiteness information down to RTL phase. The
loops in that case are simple and have only an exit respectively, it should be
taken as finite loop, I think my commit just exposed some bugs.

I'll take vacation for two weeks, will dig into this then.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92542

Paolo Carlini <paolo.carlini at oracle dot com> changed:

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--- Comment #1 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Seems already fixed. If so I will add the testcases and resolve the bug.
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markeggleston at gcc dot gnu.org changed:

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--- Comment #11 from markeggleston at gcc dot gnu.org ---
Committed:

master e4a5f73449d7352ba8128fecbc9a9570d746abdb

releases/gcc-9 f158d9197de75187fa0db26b74bc5d16b5aae242
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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Subject: [Bug tree-optimization/91825] [10 regression] Bogus -Wmaybe-uninitialized with r275744 breaks bootstrap
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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--- Comment #11 from Richard Biener <rguenth at gcc dot gnu.org> ---
Bootstrap is fixed, the uninit warning isn't a regression itself and the C++ IL
change isn't bad (it's good).  Thus let's close this one.
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Bug 24639 depends on bug 91825, which changed state.

Bug 91825 Summary: [10 regression] Bogus -Wmaybe-uninitialized with r275744 breaks bootstrap
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91825

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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91333

--- Comment #5 from Marc Glisse <glisse at gcc dot gnu.org> ---
With trunk (master?), compiling with -O3, h gives

        movapd  %xmm1, %xmm3
        addsd   %xmm3, %xmm1
        movapd  %xmm0, %xmm2
        addsd   %xmm2, %xmm0
        addsd   %xmm1, %xmm0

which looks good (the asm prevents from doing addsd %xmm1 %xmm1 directly).

However, if I add -mavx, I get

        vmovapd %xmm0, %xmm2
        vmovapd %xmm1, %xmm4
        vmovapd %xmm1, %xmm0
        vaddsd  %xmm0, %xmm4, %xmm0
        vmovapd %xmm2, %xmm3
        vaddsd  %xmm2, %xmm3, %xmm2
        vaddsd  %xmm0, %xmm2, %xmm0

That's 2 extra moves compared to the non-avx version, which seems wrong since
AVX gives more freedom to the RA.
Those initial moves look quite similar to the ones I get for f with gcc-9 -O3
-mno-avx, so the optimization looks fragile.
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 47668
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47668&action=edit
gcc10-pr91298.patch

Untested patch.
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Subject: [Bug bootstrap/92002] [10 regression] -Wuninitialized warning in gcc/wide-int.cc
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--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
Did this somehow get fixed (the bootstrap?) or require some nonstandard
configuration?
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Subject: [Bug c++/92542] [10 Regression] ICE with class template argument deduction following typo
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The ICE started with r277865 "Implement C++20 operator<=>." aka
g:b7689b962dd6536bbb2567bfdec52e35109af7ab

It was fixed with r278786 "Implement P1814R0, CTAD for alias templates." aka
g:1a291106384cabc73da0bc0f457b1cd3a4015970
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Subject: [Bug bootstrap/92002] [10 regression] -Wuninitialized warning in gcc/wide-int.cc
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--- Comment #9 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> ---
> --- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
> Did this somehow get fixed (the bootstrap?) or require some nonstandard
> configuration?

Not at all.  I still cannot make any sense of the warning, but hacked
around it by disabling -Werror for the affected files in t-sparc to get
any work done:

diff --git a/gcc/config/sparc/t-sparc b/gcc/config/sparc/t-sparc
--- a/gcc/config/sparc/t-sparc
+++ b/gcc/config/sparc/t-sparc
@@ -27,3 +27,7 @@ sparc-c.o: $(srcdir)/config/sparc/sparc-
 sparc-d.o: $(srcdir)/config/sparc/sparc-d.c
        $(COMPILE) $<
        $(POSTCOMPILE)
+
+# Hack around PR bootstrap/92002.
+tree-ssanames.o-warn += -Wno-error
+wide-int.o-warn += -Wno-error
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Subject: [Bug c++/92068] [8/9/10 Regression] ICE on invalid in process_partial_specialization
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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Subject: [Bug target/92071] [10 regression][ARM] ice in gen_movsi, at config/arm/arm.md:5378
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Richard Earnshaw from comment #5)
> (In reply to Jakub Jelinek from comment #4)
> > I'd say this should be fixed in the arm backend, instead of asserts it
> > should check whether operands are aligned and if not, perform unaligned load
> > or store,
> > because the amount of spots in the middle-end that actually just call
> > emit_move_insn when they see a MEM is huge.
> 
> Huh, this is a mid-end bug.  How can fixing it in the backend be anything
> bug a hack?
> 
> There's a contract in place here.  If the target defines STRICT_ALIGNMENT,
> the midend must NEVER pass an unaligned object to gen_movsi

Agreed.  Did anybody bisect what caused this?
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Subject: [Bug c++/92099] [9/10 Regression] static_assert of struct template of false_type succeed with GCC8 but not GCC9
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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Subject: [Bug testsuite/92165] [10 regression] g++.dg/cpp2a/nodiscard-once.C fails starting with r277205
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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Subject: [Bug tree-optimization/92152] [10 Regression] Wrong code (Resurrection of PR53663)
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
I will take a look.
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Subject: [Bug tree-optimization/92177] [10 regression] gcc.dg/vect/bb-slp-22.c FAILs
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Subject: [Bug target/92190] [10 Regression] ICE in sp_valid_at, at config/i386/i386.c:6162 since r276648
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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Subject: [Bug rtl-optimization/92264] [10 Regression] Compile time hog in 521.wrf_r with -Ofast -march=znver2 -g since r276318
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Subject: [Bug target/92303] [10 regression] gcc.target/sparc/ultrasp12.c times out
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
There's no RA commits in that range, further bisection is needed.
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Subject: [Bug tree-optimization/92328] [10 Regression] ICE in eliminate_stmt, at tree-ssa-sccvn.c:5497
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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Subject: [Bug libstdc++/92376] [9/10 Regression] bootstrap fails with --disable-hosted-libstdcxx
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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Subject: [Bug target/92388] [10 Regression] ICE in insert_regs, at cse.c:1129
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Subject: [Bug c++/92517] [10 Regression] ICE on incorrect syntax involving requires and decltype
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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Subject: [Bug c++/92531] [9/10 Regression] ICE in uses_template_parms, at cp/pt.c:10471
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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Subject: [Bug c++/92536] [10 Regression] ICE when trying to using deduction guide following unknown type error
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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Subject: [Bug tree-optimization/92539] [8/9/10 Regression] -Warray-bounds false positive (loop unroll?)
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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Subject: [Bug c++/92583] [8/9/10 Regression] internal compiler error: in tsubst_copy, at cp/pt.c:15552
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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Subject: [Bug lto/92588] [10 Regression] ICE nodes with unreleased memory found
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
AFAIU this is just a warning that we fail to "free" some GC memory?
>From gcc-bugs-return-665946-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 17 11:04:20 2020
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Subject: [Bug lto/92600] [9/10 Regression] ICE: symtab_node::verify failed, building 523.xalancbmk_r with -flto -fno-inline since r267359
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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Richard Biener <rguenth at gcc dot gnu.org> changed:

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Subject: [Bug target/93304] New: RISC-V: Function with interrupt attribute use register without save/restore at prologue/epilogue
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            Bug ID: 93304
           Summary: RISC-V: Function with interrupt attribute use register
                    without save/restore at prologue/epilogue
           Product: gcc
           Version: 9.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: kito at gcc dot gnu.org
  Target Milestone: ---
            Target: riscv64-unknown-elf

Function with interrupt attribute use register without save/restore at
prologue/epilogue.

The problem is come from register rename pass, it use register not handled at
prologue/epilogue, but it's because RISC-V didn't implement
HARD_REGNO_RENAME_OK.

Version: GCC 8, 9, trunk

Option: -O -frename-registers -march=rv64i -mabi=lp64

Testcase:

static unsigned _timer_ticks = 0;

void m_timer_interrupt(void) __attribute__((interrupt));
void m_timer_interrupt(void)
{
  _timer_ticks ++;
}

Code gen (by e4a5f73449d7352ba8128fecbc9a9570d746abdb):
m_timer_interrupt:
        addi    sp,sp,-16
        sw      a4,12(sp)
        sw      a5,8(sp)
        lui     a4,%hi(_timer_ticks)
        lw      a5,%lo(_timer_ticks)(a4)
        addi    t0,a5,1                   #
        sw      t0,%lo(_timer_ticks)(a4)  # t0 are used but it not save/restore
at prologue/epilogue
        lw      a4,12(sp)
        lw      a5,8(sp)
        addi    sp,sp,16
        mret



Reported by goxinxog@gmail.com at RISC-V SW Dev 
 list
(https://groups.google.com/a/groups.riscv.org/d/msg/sw-dev/w8CCfQwk5DA/ZC0izJvBCAAJ)
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Subject: [Bug target/91052] [10 Regression] ICE in fix_reg_equiv_init, at ira.c:2705
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--- Comment #9 from Kewen Lin <linkw at gcc dot gnu.org> ---
I can't reproduce this on both powerpc64le-linux-gnu
(edabbec31e3bfc9a9757f80c8610706ed00e5a1a) and ppc64-redhat-linux (r278916),
IIUC I need the powerpc-e300c3 environment header/library as sysroot for
cross-compiler build. Could you guide me how to get it? Does it exist somewhere
in some machine in Compiler Farm?
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Subject: [Bug c++/52985] Postincrement not applied after indexing ternary array expression
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Roland Wintersteller <roland.wintersteller@wallner-automation.com> changed:

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--- Comment #3 from Roland Wintersteller <roland.wintersteller@wallner-automation.com> ---
same with gcc-8/9/?, works with clang
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Subject: [Bug ipa/92606] [8/9/10 Regression][avr] invalid merge of symbols in progmem and data sections
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
x86 has __gs/fs address-spaces so a testcase that is broken there can be
constructed as well I guess.

Martin?
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Martin LiÅ¡ka <marxin at gcc dot gnu.org> changed:

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Subject: [Bug c++/92625] [8/9/10 Regression] Internal compiler error accessing element in static constexpr char array in template class using alias
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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Subject: [Bug target/92071] [10 regression][ARM] ice in gen_movsi, at config/arm/arm.md:5378
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--- Comment #7 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #6)
> Agreed.  Did anybody bisect what caused this?

It only came to light when we added a check in the backend.  So I'm not sure a
bisect will be that helpful, except if you try with that patch applied to every
revision under bisect.  Even that might not help as this is likely a
long-standing issue.
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Subject: [Bug c++/92654] [8/9/10 Regression] internal compiler error: in lookup_template_class_1
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Subject: [Bug debug/92763] [8/9/10 Regression] ICE in dwarf2out_abstract_function, at dwarf2out.c:22659, or in force_type_die, at dwarf2out.c:26224
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Subject: [Bug tree-optimization/92788] [10 Regression] ICE in redirect_eh_edge_1, at tree-eh.c:2313
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--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
delay the EH edge purging?  Guess then the EH edge redirect will complain
because there's no stmt throwing...
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Subject: [Bug middle-end/92815] [8/9/10 Regression] spurious -Wstringop-overflow writing into a flexible array of an extern struct
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Subject: [Bug tree-optimization/92819] [10 Regression] Worse code generated on avx2 due to simplify_vector_constructor
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Subject: [Bug tree-optimization/92822] [10 Regression] vfma_laneq_f32 and vmul_laneq_f32 are broken on aarch64 after r278938
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed?
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Subject: [Bug c++/92852] [8/9/10 Regression] location references block not in block tree
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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Subject: [Bug lto/92588] [10 Regression] ICE nodes with unreleased memory found
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--- Comment #3 from Martin LiÅ¡ka <marxin at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #2)
> AFAIU this is just a warning that we fail to "free" some GC memory?

It looks to me like this.
Btw. I can't reproduce that on current master right now.
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--- Comment #1 from Kito Cheng <kito at gcc dot gnu.org> ---
Created attachment 47669
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47669&action=edit
pr93304-v1.patch
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Subject: [Bug tree-optimization/92879] [10 Regression] incorrect warning of __builtin_memset offset is out of the bounds on zero-size allocation and initialization
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
There's eventually the possibility to adjust call_may_clobber_ref_p_1 to
handle calls that are DECL_IS_REPLACEABLE_OPERATOR_NEW_P specially.
Not sure why that is "replaceable" but you mention
new is not replaceable...  Ah, there's also DECL_IS_OPERATOR_NEW_P
(but docs say it's to be used for alias analysis on the resulting ptr).
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Subject: [Bug c++/92909] [8/9/10 Regression] ICE on incorrect lambda inside variadic template
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92955

Richard Biener <rguenth at gcc dot gnu.org> changed:

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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Can you attach preprocessed source?
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Subject: [Bug middle-end/26163] [meta-bug] missed optimization in SPEC (2k17, 2k and 2k6 and 95)
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=26163
Bug 26163 depends on bug 93144, which changed state.

Bug 93144 Summary: [10 Regression] 459.GemsFDTD debug info size increase by 50% since r279563
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93144

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Subject: [Bug ipa/93144] [10 Regression] 459.GemsFDTD debug info size increase by 50% since r279563
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93144

Richard Biener <rguenth at gcc dot gnu.org> changed:

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--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
I'd say it can be explained by inlining.
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Subject: [Bug tree-optimization/93199] [8/9/10 Regression] Compile time hog in sink_clobbers
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Subject: [Bug c++/93169] [10 regression] Variable incorrectly put into readonly section.
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Subject: [Bug target/93221] [10 Regression] ICE maximum number of generated reload insns per insn achieved (90) on aarch64
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Subject: [Bug testsuite/93227] [10 regression] g++.dg/cpp0x/std-layout1.C fails starting with r280065
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Subject: [Bug libgomp/93305] New: [OpenACC] 'acc_shutdown' vs. active data lifetimes
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93305

            Bug ID: 93305
           Summary: [OpenACC] 'acc_shutdown' vs. active data lifetimes
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Keywords: openacc
          Severity: normal
          Priority: P3
         Component: libgomp
          Assignee: unassigned at gcc dot gnu.org
          Reporter: tschwinge at gcc dot gnu.org
                CC: jakub at gcc dot gnu.org
        Depends on: 65904, 88981, 88941
  Target Milestone: ---

We need to better lay out and document how we handle 'acc_shutdown' vs. active
data lifetimes: for example, due to 'async' still running, due to OpenACC
'declare', due to OpenACC 'data' construct, due to OpenACC 'enter data' without
'exit data'.

Likewise for an implicit "shutdown" at process termination.

It seems clear that 'acc_shutdown' should immediately unmap/deallocate
everything.

It's less clear what should happen when after an 'acc_shutdown' we then again
(implicitly/explicitly) 'acc_init': how/which state gets restored?

It seems wrong that we currently make it a runtime error when "shutdown in 'acc
data' region".  (The diagnostic got added in gomp-4_0-branch r216925
"Rationalise thread-local variables in libgomp OpenACC support"; unclear what
the behavior was before.)

It's not clear what after an 'acc_shutdown' should happen in the "exit"
handling of a structured data region;
<https://github.com/OpenACC/openacc-spec/issues/257>.


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65904
[Bug 65904] Memory corruption with acc_shutdown, nvptx offloading,
libgomp.oacc-c-c++-common/asyncwait-1.c
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88941
[Bug 88941] [nvptx, openacc, libgomp] Assertion `!s->map->active' failed for
empty asynchronous parallel
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88981
[Bug 88981] [nvptx, openacc, libgomp] How to handle async regions without
corresponding wait
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Subject: [Bug tree-optimization/93258] [10 regression] Missed constant folding from constructor
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
So you need to come up with another testcase.
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Subject: [Bug rtl-optimization/93264] [10 Regression] ICE in cfg_layout_redirect_edge_and_branch_force, at cfgrtl.c:4522
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93264

Richard Biener <rguenth at gcc dot gnu.org> changed:

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Subject: [Bug tree-optimization/93271] [8/9/10 regression] SRA producing wrong code on denormals
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Richard Biener <rguenth at gcc dot gnu.org> changed:

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Subject: [Bug preprocessor/93306] New: Unnecessary file I/O done for #if 0 && __has_include(...)
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93306

            Bug ID: 93306
           Summary: Unnecessary file I/O done for #if 0 &&
                    __has_include(...)
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: preprocessor
          Assignee: nathan at gcc dot gnu.org
          Reporter: redi at gcc dot gnu.org
  Target Milestone: ---

Given:

#if 0 && __has_include("foo.h")
#endif

strace shows a lot of redundant I/O:

stat("foo.h.gch", 0x7ffdc491f760)       = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "foo.h", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or
directory)
lstat("/home", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/home/jwakely", {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
lstat("/home/jwakely/gcc", {st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
lstat("/home/jwakely/gcc/10", {st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
lstat("/home/jwakely/gcc/10/lib", {st_mode=S_IFDIR|0775, st_size=4096, ...}) =
0
lstat("/home/jwakely/gcc/10/lib/gcc", {st_mode=S_IFDIR|0775, st_size=4096,
...}) = 0
lstat("/home/jwakely/gcc/10/lib/gcc/x86_64-pc-linux-gnu",
{st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
lstat("/home/jwakely/gcc/10/lib/gcc/x86_64-pc-linux-gnu/10.0.1",
{st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
lstat("/home/jwakely/gcc/10/include", {st_mode=S_IFDIR|0775, st_size=4096,
...}) = 0
lstat("/home/jwakely/gcc/10/include/c++", {st_mode=S_IFDIR|0775, st_size=4096,
...}) = 0
lstat("/home/jwakely/gcc/10/include/c++/10.0.1", {st_mode=S_IFDIR|0775,
st_size=4096, ...}) = 0
lstat("/home/jwakely/gcc/10/include/c++/10.0.1/foo.h", 0x7ffdc491e620) = -1
ENOENT (No such file or directory)
stat("/home/jwakely/gcc/10/lib/gcc/x86_64-pc-linux-gnu/10.0.1/../../../../include/c++/10.0.1/foo.h.gch",
0x7ffdc491f760) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD,
"/home/jwakely/gcc/10/lib/gcc/x86_64-pc-linux-gnu/10.0.1/../../../../include/c++/10.0.1/foo.h",
O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or directory)
lstat("/home", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/home/jwakely", {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
lstat("/home/jwakely/gcc", {st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
lstat("/home/jwakely/gcc/10", {st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
lstat("/home/jwakely/gcc/10/lib", {st_mode=S_IFDIR|0775, st_size=4096, ...}) =
0
lstat("/home/jwakely/gcc/10/lib/gcc", {st_mode=S_IFDIR|0775, st_size=4096,
...}) = 0
lstat("/home/jwakely/gcc/10/lib/gcc/x86_64-pc-linux-gnu",
{st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
lstat("/home/jwakely/gcc/10/lib/gcc/x86_64-pc-linux-gnu/10.0.1",
{st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
lstat("/home/jwakely/gcc/10/include", {st_mode=S_IFDIR|0775, st_size=4096,
...}) = 0
lstat("/home/jwakely/gcc/10/include/c++", {st_mode=S_IFDIR|0775, st_size=4096,
...}) = 0
lstat("/home/jwakely/gcc/10/include/c++/10.0.1", {st_mode=S_IFDIR|0775,
st_size=4096, ...}) = 0
lstat("/home/jwakely/gcc/10/include/c++/10.0.1/x86_64-pc-linux-gnu",
{st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
lstat("/home/jwakely/gcc/10/include/c++/10.0.1/x86_64-pc-linux-gnu/foo.h",
0x7ffdc491e620) = -1 ENOENT (No such file or directory)
stat("/home/jwakely/gcc/10/lib/gcc/x86_64-pc-linux-gnu/10.0.1/../../../../include/c++/10.0.1/x86_64-pc-linux-gnu/foo.h.gch",
0x7ffdc491f760) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD,
"/home/jwakely/gcc/10/lib/gcc/x86_64-pc-linux-gnu/10.0.1/../../../../include/c++/10.0.1/x86_64-pc-linux-gnu/foo.h",
O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or directory)
lstat("/home", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/home/jwakely", {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
lstat("/home/jwakely/gcc", {st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
lstat("/home/jwakely/gcc/10", {st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
lstat("/home/jwakely/gcc/10/lib", {st_mode=S_IFDIR|0775, st_size=4096, ...}) =
0
lstat("/home/jwakely/gcc/10/lib/gcc", {st_mode=S_IFDIR|0775, st_size=4096,
...}) = 0
lstat("/home/jwakely/gcc/10/lib/gcc/x86_64-pc-linux-gnu",
{st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
lstat("/home/jwakely/gcc/10/lib/gcc/x86_64-pc-linux-gnu/10.0.1",
{st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
lstat("/home/jwakely/gcc/10/include", {st_mode=S_IFDIR|0775, st_size=4096,
...}) = 0
lstat("/home/jwakely/gcc/10/include/c++", {st_mode=S_IFDIR|0775, st_size=4096,
...}) = 0
lstat("/home/jwakely/gcc/10/include/c++/10.0.1", {st_mode=S_IFDIR|0775,
st_size=4096, ...}) = 0
lstat("/home/jwakely/gcc/10/include/c++/10.0.1/backward",
{st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
lstat("/home/jwakely/gcc/10/include/c++/10.0.1/backward/foo.h", 0x7ffdc491e620)
= -1 ENOENT (No such file or directory)
stat("/home/jwakely/gcc/10/lib/gcc/x86_64-pc-linux-gnu/10.0.1/../../../../include/c++/10.0.1/backward/foo.h.gch",
0x7ffdc491f760) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD,
"/home/jwakely/gcc/10/lib/gcc/x86_64-pc-linux-gnu/10.0.1/../../../../include/c++/10.0.1/backward/foo.h",
O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or directory)
lstat("/home", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/home/jwakely", {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
lstat("/home/jwakely/gcc", {st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
lstat("/home/jwakely/gcc/10", {st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
lstat("/home/jwakely/gcc/10/lib", {st_mode=S_IFDIR|0775, st_size=4096, ...}) =
0
lstat("/home/jwakely/gcc/10/lib/gcc", {st_mode=S_IFDIR|0775, st_size=4096,
...}) = 0
lstat("/home/jwakely/gcc/10/lib/gcc/x86_64-pc-linux-gnu",
{st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
lstat("/home/jwakely/gcc/10/lib/gcc/x86_64-pc-linux-gnu/10.0.1",
{st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
lstat("/home/jwakely/gcc/10/lib/gcc/x86_64-pc-linux-gnu/10.0.1/include",
{st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
lstat("/home/jwakely/gcc/10/lib/gcc/x86_64-pc-linux-gnu/10.0.1/include/foo.h",
0x7ffdc491e620) = -1 ENOENT (No such file or directory)
stat("/home/jwakely/gcc/10/lib/gcc/x86_64-pc-linux-gnu/10.0.1/include/foo.h.gch",
0x7ffdc491f760) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD,
"/home/jwakely/gcc/10/lib/gcc/x86_64-pc-linux-gnu/10.0.1/include/foo.h",
O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or directory)
lstat("/usr", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/usr/local", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/usr/local/include", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/usr/local/include/foo.h", 0x7ffdc491e620) = -1 ENOENT (No such file or
directory)
stat("/usr/local/include/foo.h.gch", 0x7ffdc491f760) = -1 ENOENT (No such file
or directory)
openat(AT_FDCWD, "/usr/local/include/foo.h", O_RDONLY|O_NOCTTY) = -1 ENOENT (No
such file or directory)
lstat("/home", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/home/jwakely", {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
lstat("/home/jwakely/gcc", {st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
lstat("/home/jwakely/gcc/10", {st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
lstat("/home/jwakely/gcc/10/include", {st_mode=S_IFDIR|0775, st_size=4096,
...}) = 0
lstat("/home/jwakely/gcc/10/include/foo.h", 0x7ffdc491e620) = -1 ENOENT (No
such file or directory)
stat("/home/jwakely/gcc/10/include/foo.h.gch", 0x7ffdc491f760) = -1 ENOENT (No
such file or directory)
openat(AT_FDCWD, "/home/jwakely/gcc/10/include/foo.h", O_RDONLY|O_NOCTTY) = -1
ENOENT (No such file or directory)
lstat("/home", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/home/jwakely", {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
lstat("/home/jwakely/gcc", {st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
lstat("/home/jwakely/gcc/10", {st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
lstat("/home/jwakely/gcc/10/lib", {st_mode=S_IFDIR|0775, st_size=4096, ...}) =
0
lstat("/home/jwakely/gcc/10/lib/gcc", {st_mode=S_IFDIR|0775, st_size=4096,
...}) = 0
lstat("/home/jwakely/gcc/10/lib/gcc/x86_64-pc-linux-gnu",
{st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
lstat("/home/jwakely/gcc/10/lib/gcc/x86_64-pc-linux-gnu/10.0.1",
{st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
lstat("/home/jwakely/gcc/10/lib/gcc/x86_64-pc-linux-gnu/10.0.1/include-fixed",
{st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
lstat("/home/jwakely/gcc/10/lib/gcc/x86_64-pc-linux-gnu/10.0.1/include-fixed/foo.h",
0x7ffdc491e620) = -1 ENOENT (No such file or directory)
stat("/home/jwakely/gcc/10/lib/gcc/x86_64-pc-linux-gnu/10.0.1/include-fixed/foo.h.gch",
0x7ffdc491f760) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD,
"/home/jwakely/gcc/10/lib/gcc/x86_64-pc-linux-gnu/10.0.1/include-fixed/foo.h",
O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or directory)
lstat("/usr", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/usr/include", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/usr/include/foo.h", 0x7ffdc491e620) = -1 ENOENT (No such file or
directory)
stat("/usr/include/foo.h.gch", 0x7ffdc491f760) = -1 ENOENT (No such file or
directory)
openat(AT_FDCWD, "/usr/include/foo.h", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such
file or directory)


This affects uses like:

#if __cplusplus >= 201703L && __has_include(<optional>)

On IRC Nathan said "I see what's happening the __has_include evaluator is
ignoring the skip_eval counter"
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Subject: [Bug other/92784] [10 regression] ICE when compiling g++.dg/torture/pr59226.C after r278944
Date: Fri, 17 Jan 2020 12:22:00 -0000
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Martin LiÅ¡ka <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #4 from Martin LiÅ¡ka <marxin at gcc dot gnu.org> ---
Fixed on trunk with g:r10-5195-ga414fd426346558d7a913af3ed82bcc1121fc880.
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Subject: [Bug target/91052] [10 Regression] ICE in fix_reg_equiv_init, at ira.c:2705
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--- Comment #10 from Martin LiÅ¡ka <marxin at gcc dot gnu.org> ---
(In reply to Kewen Lin from comment #9)
> I can't reproduce this on both powerpc64le-linux-gnu
> (edabbec31e3bfc9a9757f80c8610706ed00e5a1a) and ppc64-redhat-linux (r278916),
> IIUC I need the powerpc-e300c3 environment header/library as sysroot for
> cross-compiler build. Could you guide me how to get it? Does it exist
> somewhere in some machine in Compiler Farm?

You should not need it. One only needs to build make-host (front-ends).
>From gcc-bugs-return-665987-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 17 12:25:23 2020
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Subject: [Bug preprocessor/80005] cpp expands __has_include() filename parts
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80005

Nathan Sidwell <nathan at gcc dot gnu.org> changed:

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----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
                 CC|                            |nathan at gcc dot gnu.org
           Assignee|unassigned at gcc dot gnu.org      |nathan at gcc dot gnu.org

--- Comment #2 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
I happen to be looking in this part anyway ...
>From gcc-bugs-return-665988-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 17 12:26:13 2020
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/93301] Wrong optimization: instability of uninitialized variables leads to nonsense
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93301

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
So we perform if-conversion on the comparison with an undefined value and from
there things go downhill (guess DOM would also happily propagate equivalences).

I don't think that C guarantees that 'y' has the same value

    if (x == y) {  <--- here
        b = 1;
        z = x;
    } else {
        b = 0;
        z = y;   <--- and here
    }

at least I'd be surprised.

Note whether something is initialized or not is not readily visible in
general (it is for this particular testcase of course), so there cannot
be a "fix" that works in all cases.

My solution would be to make program behavior undefined (which as outlined
above it probably already is).
>From gcc-bugs-return-665989-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 17 12:28:03 2020
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rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> changed:

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----------------------------------------------------------------------------
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--- Comment #6 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
Fixed by r10-6036-g865257c447cc50f5819e9b53da83145f3c36c305
(forgot to mark the PR in the changelog, so it wasn't picked
up automatically).
>From gcc-bugs-return-665990-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 17 12:35:04 2020
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Subject: [Bug libstdc++/69879] Create a pointer to the default operator new and delete
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--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I missed this question, sorry. The changes needed to add new symbols to
libstdc++.so (including adjusting the tests) are documented at:
https://gcc.gnu.org/onlinedocs/libstdc++/manual/appendix_porting.html#build_hacking.configure.version
>From gcc-bugs-return-665991-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 17 12:44:20 2020
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Subject: [Bug testsuite/92165] [10 regression] g++.dg/cpp2a/nodiscard-once.C fails starting with r277200
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:

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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I think this has been fixed by
r10-4298-g2df0c2315a21a05838c8015d27678d236f4d0cd4
>From gcc-bugs-return-665992-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 17 12:46:41 2020
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Subject: [Bug tree-optimization/93258] [10 regression] Missed constant folding from constructor
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--- Comment #5 from Martin LiÅ¡ka <marxin at gcc dot gnu.org> ---
Fixed on trunk with g:r10-5888-ge0804c9b5efdf17bbfb692a787df36b86f71af8d.

Bisecting latest revisions
  e0804c9b5efdf17b(10 Jan 2020 13:47)(jason@redhat.com): [took: 4.921s] result:
OK

;; Function fn1 (_Z3fn1v, funcdef_no=9, decl_uid=2587, cgraph_uid=8,
symbol_order=8) (executed once)

fn1 ()
{
  struct o D.2606;

  <bb 2> [local count: 1073741824]:
  D.2606 = bw::ci::cj (0B, 6); [return slot optimization]
  D.2606 ={v} {CLOBBER};
  __builtin_unreachable ();

}


  640b23d7ff5f3fad(10 Jan 2020 13:46)(jason@redhat.com): [took: 5.350s] result:
OK

;; Function fn1 (_Z3fn1v, funcdef_no=9, decl_uid=2587, cgraph_uid=8,
symbol_order=8) (executed once)

fn1 ()
{
  const char * p$cd;
  struct o D.2606;
  long int _6;

  <bb 2> [local count: 1073741824]:
  p$cd_5 = ck.cd;
  _6 = p$cd_5 - "";
  D.2606 = bw::ci::cj (0B, _6); [return slot optimization]
  D.2606 ={v} {CLOBBER};
  __builtin_unreachable ();

}
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Subject: [Bug analyzer/93307] New: ODR violations
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            Bug ID: 93307
           Summary: ODR violations
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: analyzer
          Assignee: dmalcolm at gcc dot gnu.org
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  Target Milestone: ---

Bootstrapping with LTO complains about ODR issues in analyzer
../../gcc/analyzer/region-model.h:792: warning: type â€˜struct regionâ€™ violates
the C++ One Definition Rule [-Wodr]
  792 | class region
      |
../../gcc/sched-int.h:1443:8: note: a type with different virtual table
pointers is defined in another translation unit
 1443 | struct region
      |        ^
../../gcc/analyzer/region-model.h:792: warning: type â€˜struct regionâ€™ violates
the C++ One Definition Rule [-Wodr]
  792 | class region

.....

../../gcc/analyzer/region-model.h:1239: warning: type â€˜struct array_regionâ€™
violates the C++ One Definition Rule [-Wodr]
 1239 | class array_region : public region
      |
../../gcc/analyzer/region-model.h:1239: note: a type with different bases is
defined in another translation unit
 1239 | class array_region : public region
      |
../../gcc/analyzer/region-model.h:1038: warning: type â€˜struct union_regionâ€™
violates the C++ One Definition Rule [-Wodr]
 1038 | class union_region : public struct_or_union_region
      |
../../gcc/analyzer/region-model.h:1038: note: a type with different bases is
defined in another translation unit
 1038 | class union_region : public struct_or_union_region
      |
../../gcc/analyzer/region-model.h:1011: warning: type â€˜struct struct_regionâ€™
violates the C++ One Definition Rule [-Wodr]
 1011 | class struct_region : public struct_or_union_region
      |
../../gcc/analyzer/region-model.h:1011: note: a type with different bases is
defined in another translation unit
 1011 | class struct_region : public struct_or_union_region
      |
../../gcc/tree-ssa-structalias.c:531: warning: type â€˜struct constraintâ€™
violates the C++ One Definition Rule [-Wodr]
  531 | struct constraint
      |
../../gcc/analyzer/constraint-manager.h:121: note: a different type is defined
in another translation unit
  121 | class constraint
      |
../../gcc/tree-ssa-structalias.c:533: note: the first difference of
corresponding definitions is field â€˜lhsâ€™
  533 |   struct constraint_expr lhs;
      |
../../gcc/analyzer/constraint-manager.h:142: note: a field with different name
is defined in another translation unit
  142 |   equiv_class_id m_lhs;


At first glance they all seems valid. If not I would be happy to know about it.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69879

--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> ---
N.B. the new patterns your patch adds to the gnu.ver script need to use '[jmy]'
instead of 'm' for the size_t parameters, e.g.
__default_operator_new_throw[jmy]

Otherwise they will only match targets where size_t is unsigned long.
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Subject: [Bug bootstrap/92002] [10 regression] -Wuninitialized warning in gcc/wide-int.cc
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--- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
-Wno-error=uninitialized might be more appropriate for the workaround.
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--- Comment #15 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Wilco Dijkstra <wilco@gcc.gnu.org>:

https://gcc.gnu.org/g:e5e07b68187b9aa334519746c45b8cffc5eb7e5c

commit r10-6038-ge5e07b68187b9aa334519746c45b8cffc5eb7e5c
Author: Wilco Dijkstra <wdijkstr@arm.com>
Date:   Fri Jan 17 13:17:21 2020 +0000

    [AArch64] Fix shrinkwrapping interactions with atomics (PR92692)

    The separate shrinkwrapping pass may insert stores in the middle
    of atomics loops which can cause issues on some implementations.
    Avoid this by delaying splitting atomics patterns until after
    prolog/epilog generation.

    gcc/
        PR target/92692
        * config/aarch64/aarch64.c (aarch64_split_compare_and_swap)
        Add assert to ensure prolog has been emitted.
        (aarch64_split_atomic_op): Likewise.
        * config/aarch64/atomics.md (aarch64_compare_and_swap<mode>)
        Use epilogue_completed rather than reload_completed.
        (aarch64_atomic_exchange<mode>): Likewise.
        (aarch64_atomic_<atomic_optab><mode>): Likewise.
        (atomic_nand<mode>): Likewise.
        (aarch64_atomic_fetch_<atomic_optab><mode>): Likewise.
        (atomic_fetch_nand<mode>): Likewise.
        (aarch64_atomic_<atomic_optab>_fetch<mode>): Likewise.
        (atomic_nand_fetch<mode>): Likewise.
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Subject: [Bug analyzer/93281] Various analyzer testsuite failures for 32-bit targets
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--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by David Malcolm <dmalcolm@gcc.gnu.org>:

https://gcc.gnu.org/g:5f0303833d542b273da33e4b149974e739d350e5

commit r10-6039-g5f0303833d542b273da33e4b149974e739d350e5
Author: David Malcolm <dmalcolm@redhat.com>
Date:   Wed Jan 15 15:55:11 2020 -0500

    analyzer: fix handling of negative byte offsets (v2) (PR 93281)

    Various 32-bit targets show failures in gcc.dg/analyzer/data-model-1.c
    with tests of the form:
      __analyzer_eval (q[-2].x == 107024); /* { dg-warning "TRUE" } */
      __analyzer_eval (q[-2].y == 107025); /* { dg-warning "TRUE" } */
    where they emit UNKNOWN instead.

    The root cause is that gimple has a byte-based twos-complement offset
    of -16 expressed like this:
      _55 = q_92 + 4294967280;  (32-bit)
    or:
      _55 = q_92 + 18446744073709551600; (64-bit)

    Within region_model::convert_byte_offset_to_array_index that unsigned
    offset was being divided by the element size to get an offset within
    an array.

    This happened to work on 64-bit target and host, but not elsewhere;
    the offset needs to be converted to a signed type before the division
    is meaningful.

    This patch does so, fixing the failures.

    gcc/analyzer/ChangeLog:
        PR analyzer/93281
        * region-model.cc
        (region_model::convert_byte_offset_to_array_index): Convert to
        ssizetype before dividing by byte_size.  Use fold_binary rather
        than fold_build2 to avoid needlessly constructing a tree for the
        non-const case.
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David Malcolm <dmalcolm at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #5 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Should be fixed by r10-6039-g5f0303833d542b273da33e4b149974e739d350e5
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/69879] Create a pointer to the default operator new and delete
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69879

--- Comment #10 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Daniel Gutson from comment #0)
> This issue comes from the following discussion:
> 
> https://gcc.gnu.org/ml/libstdc++/2015-11/msg00009.html
> 
> In short: Pedro Alves suggested as a solution the addition of a pointer to
> the original (default) operator new and another for the operator delete,
> e.g. __default_operator_new and __default_operator_delete.
> This will allow users to override the global operators new and delete, and
> yet call the original implementations, for example to alter the behavior
> when there is no memory and the nothrow new should not iterate calling the
> new_handler.

Re-reading that thread, I'm not really convinced by the motivation. the
requirement is based on a fairly convoluted set of self-imposed conditions. 

Since PR 68210 was fixed, the no-throw versions of operator new are now coupled
to the throwing operator new. That means you only need to replace one version
of new/delete and the others will use it. So we probably don't need to expose a
__default_operator_xxx pointer for every overload now.

Also, the original problem described in
https://gcc.gnu.org/ml/libstdc++/2015-11/msg00009.html should no longer exist.
The new-handler should simply throw when it can't make more memory available
(as required by the standard), and that will cause the nothrow operator new to
return null.

There is a tangential problem though, which I am interested in.

ince PR 68210 was fixed, when libstdc++ itself is built with -fno-exceptions
then failure to allocate will abort the process, even if you use the nothrow
operator new.

I'm interested in a solution that allows operator new(nothrow_t, size_t) to
return null when built with -fno-exceptions.

One approach might be for operator new(nothrow_t, size_t) to detect when
operator new(size_t) has been replaced (which might involve comparing its
address with something like __default_operator_new_throw, and if the addresses
are the same (i.e. the user hasn't replaced operator new) then do the work
directly instead of calling operator new(size_t), but return null instead of
throwing.

That would make new(nothrow) useful again in environment where even libstdc++
is built with -fno-exceptions.

Also, the alternative implementation of operator new(nothrow_t, size_t) could
potentially use a different type of new-handler, which could be used to get the
behaviour that motivated this bug report and the thread above. 

So something like this in libsupc++/new_opnt.cc

using __nothrow_new_handler = bool(*)();
extern __nothrow_new_handler __nt_new_handler;

_GLIBCXX_WEAK_DEFINITION void *
operator new (std::size_t sz, const std::nothrow_t&) noexcept
{
#if __cpp_exceptions
  // _GLIBCXX_RESOLVE_LIB_DEFECTS
  // 206. operator new(size_t, nothrow) may become unlinked to ordinary
  // operator new if ordinary version replaced
  __try
    {
      return ::operator new(sz);
    }
  __catch (...)
    {
      return nullptr;
    }
#else // no-exceptions
  if ( /* operator new has been replaced */ )
    return ::operator new(sz);

  // otherwise, do the allocation directly so we can return null on failure

  void *p;

  /* malloc (0) is unpredictable; avoid it.  */
  if (__builtin_expect (sz == 0, false))
    sz = 1;

  while ((p = malloc (sz)) == 0)
    {
      if (__nt_new_handler && __nt_new_handler())
        continue; // retry
      new_handler handler = std::get_new_handler ();
      if (! handler)
        return 0;
      handler ();
    }

  return p;
#endif
}

This would allow a program to set a non-standard handler that doesn't have to
throw or terminate if it can't make memory available, causing the nothrow-new
to return null, which was the original aim.

I think something like this would solve the original problem, but *also* make
nothrow-new more useful for people who aren't installing new-handlers.
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From: "r.j.hogan at reading dot ac.uk" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/93308] New: bind(c) subroutine changes lower bound of array argument in caller
Date: Fri, 17 Jan 2020 13:32:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93308

            Bug ID: 93308
           Summary: bind(c) subroutine changes lower bound of array
                    argument in caller
           Product: gcc
           Version: 9.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: r.j.hogan at reading dot ac.uk
  Target Milestone: ---

Created attachment 47670
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47670&action=edit
Self contained source file that demonstrates the bug

When the attached program is compiled and run, the allocatable array has its
lbound changed from 1 to 0 when it returns from the bind(c) routine, while the
explicit-shape array does not. This can be seen from the output line:

 After call:  lbound(A) =            0 , A(1) =    2.00000000    

Correct behaviour (the lbound is not changed) is found when the same code is
compiled using gfortran 8.3.0 or earlier, or using the Intel Fortran compiler.
Note that all versions of gfortran I have used issue the following warning,
whether or not their behaviour is correct:

Warning: Variable â€˜vâ€™ at (1) is a dummy argument of the BIND(C) procedure
â€˜routine_bindcâ€™ but may not be C interoperable [-Wc-binding-type]

This bug is unfortunate because as far as I can see the other Fortran-2018
aspects of passing arrays to and from C/C++ work well.

Thanks, Robin Hogan.

$ gfortran -v
Using built-in specs.
COLLECT_GCC=gfortran
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/9/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none:hsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 9.2.1-9ubuntu2'
--with-bugurl=file:///usr/share/doc/gcc-9/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++,gm2 --prefix=/usr
--with-gcc-major-version-only --program-suffix=-9
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-plugin --enable-default-pie --with-system-zlib
--with-target-system-zlib=auto --enable-multiarch --disable-werror
--with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32
--enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none,hsa
--without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 9.2.1 20191008 (Ubuntu 9.2.1-9ubuntu2)
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Subject: [Bug tree-optimization/93301] Wrong optimization: instability of uninitialized variables leads to nonsense
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93301

--- Comment #2 from Alexander Cherepanov <ch3root at openwall dot com> ---
The problem is much more serious. It's not that C has some guarantees about two
values of `y` while gcc doesn't provide them. It's that one part of gcc assumes
there are some guarantees about two values of `y` while another part of gcc
doesn't provide such guarantees.

There were many discussions about "wobbly" values (DR 260, DR 451 etc.) and I
don't expect gcc to give the same values for two `y`s at all. The second value
is taken in the `else` branch, which we don't care about (at least while this
branch doesn't invoke UB). Given that `b` is `1` we know that the `then` branch
is taken.

It's surely possible to make this testcase undefined. If I understand them
correctly, llvm folks claim that "real compilers" (gcc included I assume)
follow rules that are more like C++ than C (see the linked clang bug report).
The C++ rules are much more strict and make `x == y` undefined if `y` is
uninitialized.

But my guess is that the C++ rules will not help. The problem is the internal
inconsistency so everything will blow up independently of any external rules.
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Subject: [Bug analyzer/93307] ODR violations
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93307

--- Comment #1 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Looks like a valid complaint to me; sorry about the breakage.

Possibly a silly question, but how do you specify an LTO bootstrap?   I'm
wondering why I'm not running into this; I'm configuring with "lto" in my
--enable-languages.

I guess I'll introduce a namespace to put the analyzer names in.  "ana" is nice
and short.
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Subject: [Bug preprocessor/93306] Unnecessary file I/O done for #if 0 && __has_include(...)
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93306

Nathan Sidwell <nathan at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |FIXED

--- Comment #1 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
Fixed bf09d886a4be1031f7003073115af6cbc5575353
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--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Nathan Sidwell <nathan@gcc.gnu.org>:

https://gcc.gnu.org/g:bf09d886a4be1031f7003073115af6cbc5575353

commit r10-6040-gbf09d886a4be1031f7003073115af6cbc5575353
Author: Nathan Sidwell <nathan@acm.org>
Date:   Fri Jan 17 05:39:47 2020 -0800

    [PR93306] Short-circuit has_include

    the preprocessor evaluator has a skip_eval counter, but we weren't
    checking it after parsing has_include(foo), but before looking for
    foo.  Resulting in unnecessary io for 'FALSE_COND && has_include <foo>'

        PR preprocessor/93306
        * expr.c (parse_has_include): Refactor.  Check skip_eval before
        looking.
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:

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                 CC|                            |ebotcazou at gcc dot gnu.org

--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The ICE started with r10-2840-g70cdb21e579191fe9f0f1d45e328908e59c0179e
but we generated silently wrong-code before that, I believe since
r7-5812-ga271e415611a80f1e86e625fd61360e193d04474
        ldr     r3, .L3
        ldr     r3, [r3]
        ldm     r3, {r0, r1}
        b       bar
is what we generate with that r244249 and up, which likely doesn't handle if a
is not 8 (or just 4) byte aligned.
Before that we emitted
        push    {r4, r5, lr}
        ldr     r3, .L4
        ldr     r3, [r3]
        ldrb    r0, [r3]        @ zero_extendqisi2
        ldrb    r1, [r3, #5]    @ zero_extendqisi2
        ldrb    ip, [r3, #1]    @ zero_extendqisi2
        ldrb    r2, [r3, #4]    @ zero_extendqisi2
        ldrb    r5, [r3, #2]    @ zero_extendqisi2
        ldrb    r4, [r3, #6]    @ zero_extendqisi2
        orr     r2, r2, r1, lsl #8
        ldrb    lr, [r3, #3]    @ zero_extendqisi2
        orr     ip, r0, ip, lsl #8
        ldrb    r1, [r3, #7]    @ zero_extendqisi2
        orr     r0, ip, r5, lsl #16
        orr     r2, r2, r4, lsl #16
        orr     r0, r0, lr, lsl #24
        orr     r1, r2, r1, lsl #24
        pop     {r4, r5, lr}
        b       bar
which clearly can handle unaligned load.
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Subject: [Bug libstdc++/69879] Create a pointer to the default operator new and delete
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Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=86013

--- Comment #11 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Stated differently, the original problem is "the new-handler can only prevent
looping by throwing an exception or terminating, which isn't appropriate for
enironments using -fno-exceptions".

The first solution (proposed on the mailing list) was to add a custom build
mode that prevents looping, but makes operator new non-conforming.

The solution proposed in comment 0 is to allow users to override new/delete
with their desired behaviour but still call the default versions. The more I
think about it, the more I dislike that. The new-handler is a global variable,
so switching it back and forth like that is completely incompatible with
multithreaded programs. As soon as two threads use new at the same time, you
have no idea which new-handler will be used by __default_operator_new. I think
the approach is completely untenable. Also, it would rely on GNU-specific
symbols that only exist in libstdc++, so those symbols are completely
redundant. The defaults in libstdc++ just use malloc. Fact. If you have to
replace new anyway then just make it use malloc directly, instead of relying on
__default_operator_new, which is just going to call malloc.

I think the only sensible approach here is "make nothrow-new work without
exceptions". So don't call the throwing new and try to catch the exception, and
don't assume the new-handler will throw when it couldn't make memory available.

PR 86013 comment 8 shows a possible way to implement the check here:

  if ( /* operator new has been replaced */ )
    return ::operator new(sz);
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Subject: [Bug c++/93228] [[deprecated("message")]] on template struct/class drops message
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--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jakub Jelinek <jakub@gcc.gnu.org>:

https://gcc.gnu.org/g:c60a18f8056facdcf370ce0e5f51550c9df5b539

commit r10-6041-gc60a18f8056facdcf370ce0e5f51550c9df5b539
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Fri Jan 17 15:22:22 2020 +0100

    c++: Fix deprecated attribute handling on templates (PR c++/93228)

    As the following testcase shows, when deprecated attribute is on a
template,
    we'd never print the message if any, because the attribute is not
    present on the TEMPLATE_DECL with which warn_deprecated_use is called,
    but on its DECL_TEMPLATE_RESULT or its type.

    2020-01-17  Jakub Jelinek  <jakub@redhat.com>

        PR c++/93228
        * parser.c (cp_parser_template_name): Look up deprecated attribute
        in DECL_TEMPLATE_RESULT or its type's attributes.

        * g++.dg/cpp1y/attr-deprecated-3.C: New test.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92531

--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jason Merrill <jason@gcc.gnu.org>:

https://gcc.gnu.org/g:eff9c61dfb082cb3ea26f354d795e4098ec76866

commit r10-6042-geff9c61dfb082cb3ea26f354d795e4098ec76866
Author: Jason Merrill <jason@redhat.com>
Date:   Fri Jan 17 08:37:49 2020 -0500

    PR c++/92531 - ICE with noexcept(lambda).

    This was failing because uses_template_parms didn't recognize LAMBDA_EXPR
as
    a kind of expression.  Instead of trying to enumerate all the different
    varieties of expression and then aborting if what's left isn't
    error_mark_node, let's handle error_mark_node and then assume anything else
    is an expression.

        * pt.c (uses_template_parms): Don't try to enumerate all the
        expression cases.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69879

--- Comment #12 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Created attachment 47671
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47671&action=edit
Elide exception handling in nothrow new

Here's a proof of concept showing how to make the nothrow operator work without
exceptions, and also give up if the new_handler keeps returning without making
enough memory available.

This avoids the overhead of throwing and catching bad_alloc, which is what I
care about.

Does this also adequately address the original concern?

The (tries > 100) part should probably be user-controllable (maybe by a
glibc-style tunable, see PR 88264).
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Subject: [Bug c++/92531] [9 Regression] ICE in uses_template_parms, at cp/pt.c:10471
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92531

Jason Merrill <jason at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
      Known to work|                            |10.0
           Assignee|unassigned at gcc dot gnu.org      |jason at gcc dot gnu.org
            Summary|[9/10 Regression] ICE in    |[9 Regression] ICE in
                   |uses_template_parms, at     |uses_template_parms, at
                   |cp/pt.c:10471               |cp/pt.c:10471

--- Comment #5 from Jason Merrill <jason at gcc dot gnu.org> ---
Fixed on trunk so far.
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Subject: [Bug fortran/93309] New: Wrong error about duplicate implicit none
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93309

            Bug ID: 93309
           Summary: Wrong error about duplicate implicit none
           Product: gcc
           Version: 9.2.1
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gfortran thinks the following module code is wrong:


$ cat ine.f90 
module m
  implicit none(external)
contains
  subroutine s
    implicit none(external)
  end subroutine
end module
$ gfortran-9 -std=f2018 ine.f90 -c -o ine.o
ine.f90:5:17:

    5 |     implicit none(external)
      |                 1
Error: Duplicate IMPLICIT NONE statement at (1)


As far as I can see, this is valid Fortran 2018: when the standard says

"C891 [...] No more than one IMPLICIT NONE statement shall appear in a scoping
unit."

one has to bear in mind that a module and a contained subprogram are two
different scoping units.  And while

"C895 If IMPLICIT NONE with an implicit-none-spec of EXTERNAL appears within a
scoping unit, the name of an external or dummy procedure in that scoping unit
or in a contained subprogram or BLOCK construct shall have [...]"

means that the effects of a module-level IMPLICIT NONE(EXTERNAL) also extend to
the subprograms the module contains, it does not forbid repeating an IMPLICIT
NONE(EXTERNAL) statement in them.

If there is another reason why this is forbidden I would like to know.
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Subject: [Bug c++/93310] New: Incorrect constexpr virtual evaluation inside a constructor
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93310

            Bug ID: 93310
           Summary: Incorrect constexpr virtual evaluation inside a
                    constructor
           Product: gcc
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The following testcase gets miscompiled on GCC 9 and on GCC 10 with
-DUSE_CONSTEXPR due to (I believe) the constexpr virtual evaluation incorrectly
resolving the dynamic type of ((A *)this) to C rather than B inside B's
constructor.

$ cat virtual-2.cc
#if defined USE_CONSTEXPR
# define CONSTEXPR constexpr
#else
# define CONSTEXPR
#endif

struct A
{
  virtual CONSTEXPR char f () const
  { return 'A'; }
};

struct B : A
{
  char x;

  constexpr B () : x (0)
  { x = ((A *)this)->f(); }

  virtual CONSTEXPR char f () const
  { return 'B'; }
};

struct C : B
{
  virtual CONSTEXPR char f () const
  { return 'C'; }
};

int main ()
{
  CONSTEXPR C c;
  if (c.x != 'B')
    __builtin_abort ();
}
$ g++ -std=c++2a virtual-2.cc
$ ./a.out
$ g++ -std=c++2a virtual-2.cc -DUSE_CONSTEXPR
$ ./a.out
zsh: abort     ./a.out
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Subject: [Bug fortran/93263] [9/10 Regression] -fno-automatic and RECURSIVE
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93263

--- Comment #12 from markeggleston at gcc dot gnu.org ---
Committed:

master https://gcc.gnu.org/g:e4a5f73449d7352ba8128fecbc9a9570d746abdb

releases/gcc-9 https://gcc.gnu.org/g:f158d9197de75187fa0db26b74bc5d16b5aae242

Updated to URLs.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93227

--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jonathan Wakely <redi@gcc.gnu.org>:

https://gcc.gnu.org/g:f1a7789d0f4780b296b66e93f598bf2b2c109f43

commit r10-6046-gf1a7789d0f4780b296b66e93f598bf2b2c109f43
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Fri Jan 10 13:04:09 2020 +0000

    Fix g++ testsuite failure caused by std::is_pod deprecation

        PR testsuite/93227
        * g++.dg/cpp0x/std-layout1.C: Use -Wno-deprecated-declarations for
        C++20, due to std::is_pod being deprecated.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93227

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Patch approved by Jason on IRC and committed.
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Subject: [Bug c++/93311] New: Missing "warning" when instantiating a constexpr function
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93311

            Bug ID: 93311
           Summary: Missing "warning" when instantiating a constexpr
                    function
           Product: gcc
           Version: 9.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: kuzniar95 at o2 dot pl
  Target Milestone: ---

The following piece of code produces a binary but the compiler output doesn't
inform if it's a warning or an error.

Compilation command: g++ -std=c++17 main.cpp

//----------------------
#include <array>
#include <cstddef>

template <std::size_t Size>
constexpr std::array<int, Size> foo() noexcept
{
    std::array<int, Size> ret;
    return ret;
}

int main()
{
    foo<2>();
}
//----------------------

The above results in:

//----------------------
In file included from main.cpp:1:

main.cpp: In instantiation of 'constexpr std::array<int, Size> foo() [with long
unsigned int Size = 2]':

main.cpp:13:13:   required from here

/usr/local/include/c++/9.2.0/array:94:12: note: 'struct std::array<int, 2>' has
no user-provided default constructor

   94 |     struct array

      |            ^~~~~

/usr/local/include/c++/9.2.0/array:110:56: note: and the implicitly-defined
constructor does not initialize 'int std::array<int, 2>::_M_elems [2]'

  110 |       typename _AT_Type::_Type                         _M_elems;

      |                                                        ^~~~~~~~

//----------------------

By the way
- adding a pair of empty braces there (i.e. ret{}) solves the issue, which is
OK
- "untemplatizing" the function leads to "error: uninitialized variable 'ret'
in 'constexpr' function", which also is OK (see:
https://stackoverflow.com/questions/26568820/why-do-templates-allow-constexpr-function-members-with-non-constexpr-constructor)
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Subject: [Bug testsuite/92829] [10 regression] several test case failures starting with r278983
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92829

--- Comment #5 from Martin Sebor <msebor at gcc dot gnu.org> ---
Only the gcc.dg/Warray-bounds-56.c failure.  I still see the failures below in
a recent test result
(https://gcc.gnu.org/ml/gcc-testresults/2020-01/msg00764.html):

FAIL: gcc.dg/Wstringop-overflow-25.c  (test for warnings, line 317)
FAIL: gcc.dg/Wstringop-overflow-25.c  (test for warnings, line 318)
FAIL: gcc.dg/Wstringop-overflow-25.c  (test for warnings, line 319)

FAIL: g++.dg/warn/Wstringop-overflow-4.C  -std=gnu++14  (test for warnings,
line 117)
FAIL: g++.dg/warn/Wstringop-overflow-4.C  -std=gnu++17  (test for warnings,
line 117)
FAIL: g++.dg/warn/Wstringop-overflow-4.C  -std=gnu++2a  (test for warnings,
line 117)
FAIL: g++.dg/warn/Wstringop-overflow-4.C  -std=gnu++98  (test for warnings,
line 117)
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Subject: [Bug c++/22466] ICE on classes in template functions which attempt closure
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=22466

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Alexander Monakov <amonakov@gcc.gnu.org>:

https://gcc.gnu.org/g:2c2e9f7a5d4b5db97f268ae247b3a82b1610a543

commit r10-6048-g2c2e9f7a5d4b5db97f268ae247b3a82b1610a543
Author: Alexander Monakov <amonakov@ispras.ru>
Date:   Fri Jan 17 18:15:44 2020 +0300

    gdbinit.in: make shorthands accept an explicit argument

    Make gdb shorthands such as 'pr' accept an argument, in addition to
    implictly taking register '$' as the thing to examine.

    The 'eval ...' one-liners are used to workaround GDB bug #22466.

        * gdbinit.in (help-gcc-hooks): New command.
        (pp, pr, prl, pt, pct, pgg, pgq, pgs, pge, pmz, ptc, pdn, ptn, pdd,
prc,
        pi, pbm, pel, trt): Take $arg0 instead of $ if supplied. Update
        documentation.
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Subject: [Bug c++/93311] Missing "warning" when instantiating a constexpr function
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93311

Jonathan Wakely <redi at gcc dot gnu.org> changed:

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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
It's a "note" that follows a warning, but the warning is suppressed in that
context. I think this is PR 90243 which I already fixed on trunk.

*** This bug has been marked as a duplicate of bug 90243 ***
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Subject: [Bug c++/90243] diagnostic notes that belong to a suppressed error about an uninitialized variable in a constexpr function are still shown
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Jonathan Wakely <redi at gcc dot gnu.org> changed:

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----------------------------------------------------------------------------
                 CC|                            |kuzniar95 at o2 dot pl

--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 93311 has been marked as a duplicate of this bug. ***
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Subject: [Bug tree-optimization/88443] [meta-bug] bogus/missing -Wstringop-overflow warnings
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88443
Bug 88443 depends on bug 91699, which changed state.

Bug 91699 Summary: [10 Regression] Bogus Wstringop-overflow in Fotran with -flto after revision r274997
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91699

           What    |Removed                     |Added
----------------------------------------------------------------------------
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         Resolution|---                         |WORKSFORME
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Martin Sebor <msebor at gcc dot gnu.org> changed:

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--- Comment #6 from Martin Sebor <msebor at gcc dot gnu.org> ---
I don't see these failures in recent test results for
aarch64,powerpc64,x86_64}-linux so I'm going to resolve this as working.

Dominique and/or Iain, please confirm and reopen if the failures persist on
your targets (which ones?).
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:

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--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
--- libcpp/expr.c.jj    2020-01-17 15:21:20.450514947 +0100
+++ libcpp/expr.c       2020-01-17 16:37:55.298369858 +0100
@@ -2202,12 +2202,16 @@ parse_has_include (cpp_reader *pfile, en
   result.low = 0;

   pfile->state.in__has_include__++;
+  bool saved_angled_headers = pfile->state.angled_headers;
+  pfile->state.angled_headers = 1;

   const cpp_token *token = cpp_get_token (pfile);
   bool paren = token->type == CPP_OPEN_PAREN;
   if (paren)
     token = cpp_get_token (pfile);

+  pfile->state.angled_headers = saved_angled_headers;
+
   bool bracket = token->type != CPP_STRING;
   cpp_hashnode *node = NULL;
   char *fname = NULL;
fixes this for me.
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Subject: [Bug fortran/93175] ICE involving nested parameterized derived types
Date: Fri, 17 Jan 2020 15:51:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93175

markeggleston at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2020-01-17
                 CC|                            |markeggleston at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from markeggleston at gcc dot gnu.org ---
Confirmed.

For master (10.0)

at https://gcc.gnu.org/g:6ed8c923325c9b2fcb30996fa14582ac136d9329

pr93175.f90:30:0:

   30 | end program pdt_test
      | 
internal compiler error: Segmentation fault
0xd8158f crash_signal
        ../../gcc/gcc/toplev.c:328
0x6acc63 insert_parameter_exprs
        ../../gcc/gcc/fortran/decl.c:3542
0x6cbd19 gfc_traverse_expr(gfc_expr*, gfc_symbol*, bool (*)(gfc_expr*,
gfc_symbol*, int*), int)
        ../../gcc/gcc/fortran/expr.c:5188
0x78c245 structure_alloc_comps
        ../../gcc/gcc/fortran/trans-array.c:9522
0x790766 gfc_allocate_pdt_comp(gfc_symbol*, tree_node*, int,
gfc_actual_arglist*)
        ../../gcc/gcc/fortran/trans-array.c:9838
0x78b313 structure_alloc_comps
        ../../gcc/gcc/fortran/trans-array.c:9597
0x790766 gfc_allocate_pdt_comp(gfc_symbol*, tree_node*, int,
gfc_actual_arglist*)
        ../../gcc/gcc/fortran/trans-array.c:9838
0x7a460f gfc_trans_deferred_vars(gfc_symbol*, gfc_wrapped_block*)
        ../../gcc/gcc/fortran/trans-decl.c:4653
0x7a7a33 gfc_generate_function_code(gfc_namespace*)
        ../../gcc/gcc/fortran/trans-decl.c:6928
0x722fb8 translate_all_program_units
        ../../gcc/gcc/fortran/parse.c:6302
0x722fb8 gfc_parse_file()
        ../../gcc/gcc/fortran/parse.c:6541
0x76e30f gfc_be_parse_file
        ../../gcc/gcc/fortran/f95-lang.c:210

Also occurs on releases/gcc-8 checked 8.1.0 and 8.5.0 and on releases/gcc-9
checked 9.2.0
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Subject: [Bug libstdc++/92376] [8/9/10 Regression] bootstrap fails with --disable-hosted-libstdcxx
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92376

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|9.3                         |8.4
            Summary|[9/10 Regression] bootstrap |[8/9/10 Regression]
                   |fails with                  |bootstrap fails with
                   |--disable-hosted-libstdcxx  |--disable-hosted-libstdcxx

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I'm not sure if the aligned_alloc problem started with gcc-6 or gcc-7, but it's
definitely present in gcc-8 so needs fixing there too.
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Subject: [Bug c/57612] add builtin to assert that expression does not have side effects
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57612

--- Comment #4 from Tom Tromey <tromey at gcc dot gnu.org> ---
(In reply to H. Peter Anvin from comment #2)
> I would like to second this request, however, I would like to request that
> it issues a warning rather than an error.  It can always be promoted to an
> error via -Werror= or the equivalent pragma.

What's the use case for this?
It seems simpler to just not use this macro when you don't want the effect.

(In reply to felix from comment #3)
> Overlaps bug 6906. Under that ticket, I proposed adding a built-in that
> simply returns whether or not a given expression has side effects, simply by
> exposing TREE_SIDE_EFFECTS().

This seems the same to me, in that __builtin_assert_no_side_effects
could, I think, just be a static_assert using your builtin.
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Subject: [Bug c++/93310] Incorrect constexpr virtual evaluation inside a constructor
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:

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----------------------------------------------------------------------------
           Keywords|                            |wrong-code
             Status|UNCONFIRMED                 |NEW
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                 CC|                            |mpolacek at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed.
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Subject: [Bug c++/93299] [9/10 Regression] ICE in tsubst_copy, at cp/pt.c:15779
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |ice-on-valid-code
             Status|WAITING                     |NEW
                 CC|                            |mpolacek at gcc dot gnu.org

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
class : d<0> {

certainly not valid.  But this one seems to be valid and still ICEs:

template <typename> struct a {
  enum { b = 8 };
};
class c;
template <int> class __attribute__((aligned((a<c>::b)))) d {};
class c : d<0> { };
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Subject: [Bug c++/93299] [9/10 Regression] ICE in tsubst_copy, at cp/pt.c:15779
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--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Seems to have started with g:e4511ca2e9ecdb51d41b64452398f8e2df575668.
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Subject: [Bug middle-end/92815] [8/9/10 Regression] spurious -Wstringop-overflow writing into a flexible array of an extern struct
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Martin Sebor <msebor at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |wrong-code

--- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> ---
The is a bug in the object size pass that has existed since its introduction. 
The addr_object_size() computes the size of the extern object based on its
type, not taking into consideration that, as an extension, GCC allows flexible
array members to be initialized to more elements than would otherwise fit into
the struct.  To avoid this, the function needs to conservatively fail for
uninitialized extern structs with a flexible array member.

The modified test case below illustrates it.  With _FORTIFY_SOURCE defined, it
aborts.

$ cat pr92815.c && gcc -O2 -Wall -c pr92815.c && gcc -D_FORTIFY_SOURCE=2 -DMAIN
-O2 -Wall pr92815.c pr92815.o && ./a.out
#include <string.h>

struct S { int n; char ax[]; };

#if MAIN
extern struct S s;
__attribute__ ((noipa)) void g (void)
{
  strcpy (s.ax, "123");
}
int main (void) { g (); }
#else
struct S s = { 5, { 1, 2, 3, 4, 5 } };
#endif

In file included from /usr/include/string.h:494,
                 from pr92815.c:1:
In function â€˜strcpyâ€™,
    inlined from â€˜gâ€™ at pr92815.c:9:3:
/usr/include/bits/string_fortified.h:90:10: warning: â€˜__builtin___strcpy_chkâ€™
writing 4 bytes into a region of size 0 [-Wstringop-overflow=]
   90 |   return __builtin___strcpy_chk (__dest, __src, __bos (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
pr92815.c: In function â€˜gâ€™:
pr92815.c:6:17: note: at offset 0 to object â€˜sâ€™ with size 4 declared here
    6 | extern struct S s;
      |                 ^
In file included from /usr/include/string.h:494,
                 from pr92815.c:1:
In function â€˜strcpyâ€™,
    inlined from â€˜gâ€™ at pr92815.c:9:3:
/usr/include/bits/string_fortified.h:90:10: warning: â€˜__builtin___memcpy_chkâ€™
offset [4, 7] is out of the bounds [0, 4] of object â€˜sâ€™ with type â€˜struct Sâ€™
[-Warray-bounds]
   90 |   return __builtin___strcpy_chk (__dest, __src, __bos (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
pr92815.c: In function â€˜gâ€™:
pr92815.c:6:17: note: â€˜sâ€™ declared here
    6 | extern struct S s;
      |                 ^
*** buffer overflow detected ***: ./a.out terminated
Aborted (core dumped)
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Subject: [Bug tree-optimization/92788] [10 Regression] ICE in redirect_eh_edge_1, at tree-eh.c:2313
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92788

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The problem is exactly in the EH edge purging being delayed, if it would be
done before thread_through_all_blocks, then it might work.  But not sure if the
edge purging doesn't invalidate something that thread_through_all_blocks relies
on (and we'd need to repeat the EH edge purging after
thread_through_all_blcoks).
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kuzniar95 at o2 dot pl changed:

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----------------------------------------------------------------------------
         Resolution|DUPLICATE                   |FIXED

--- Comment #2 from kuzniar95 at o2 dot pl ---
@Jonathan Wakely
I've managed to find an online GCC10 compiler so I can now confirm that it's
indeed been fixed. Thanks!
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Subject: [Bug middle-end/93076] [10 Regression] internal compiler error: Segmentation fault during GIMPLE pass: cddce
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:

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                 CC|                            |jakub at gcc dot gnu.org
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The #c0 ICE has been fixed with r280126, so it is yet another dup of the many
tree sharing PRs.

*** This bug has been marked as a duplicate of bug 93173 ***
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Subject: [Bug c++/93173] [10 Regression] "error: incorrect sharing of tree nodes" and "internal compiler error: verify_gimple failed"
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:

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                 CC|                            |raj.khem at gmail dot com

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
*** Bug 93076 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-666035-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 17 17:04:39 2020
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Subject: [Bug libstdc++/92376] [8/9/10 Regression] bootstrap fails with --disable-hosted-libstdcxx
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92376

--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jonathan Wakely <redi@gcc.gnu.org>:

https://gcc.gnu.org/g:0ba6a850b597236832140bf57bf6083b6fab93f9

commit r10-6049-g0ba6a850b597236832140bf57bf6083b6fab93f9
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Fri Jan 17 15:49:02 2020 +0000

    libstdc++: Fix freestanding build PR 92376)

    In a freestanding library we don't install the <pstl/pstl_config.h>
    header, so don't try to include it unless it exists.

    Explicitly declare aligned alloc functions for freestanding, because
    <cstdlib> doesn't declare them.

        PR libstdc++/92376
        * include/bits/c++config: Only do PSTL config when the header is
        present, to fix freestanding.
        * libsupc++/new_opa.cc [!_GLIBCXX_HOSTED]: Declare allocation
        functions if they were detected by configure.
>From gcc-bugs-return-666036-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 17 17:05:12 2020
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Subject: [Bug libstdc++/92376] [8/9 Regression] bootstrap fails with --disable-hosted-libstdcxx
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Jonathan Wakely <redi at gcc dot gnu.org> changed:

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----------------------------------------------------------------------------
            Summary|[8/9/10 Regression]         |[8/9 Regression] bootstrap
                   |bootstrap fails with        |fails with
                   |--disable-hosted-libstdcxx  |--disable-hosted-libstdcxx

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed on trunk so far.
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Subject: [Bug c++/93299] [9/10 Regression] ICE in tsubst_copy, at cp/pt.c:15779
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93299

--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
force_paren_expr now creates a VIEW_CONVERT_EXPR:
+      expr = build1 (VIEW_CONVERT_EXPR, TREE_TYPE (expr), expr);
+      REF_PARENTHESIZED_P (expr) = true;
but it's not a case that tsubst_copy can handle:
16426           /* We shouldn't see any other uses of these in templates.  */
16427           gcc_unreachable ();
as it's not a location_wrapper_p or a TEMPLATE_PARM_INDEX wrapper in a
VIEW_CONVERT_EXPR.
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Jonathan Wakely <redi at gcc dot gnu.org> changed:

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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This isn't going to get fixed for GCC 10.1, sorry.
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Subject: [Bug libstdc++/90295] Please define ~exception_ptr inline
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69724

Jonathan Wakely <redi at gcc dot gnu.org> changed:

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--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #5)
> I'm leaving this open until std::async is changed too.

Which isn't in scope for GCC 10 now.
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Subject: [Bug libstdc++/66742] abort on sorting list with custom allocator that is not stateless
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66742

Jonathan Wakely <redi at gcc dot gnu.org> changed:

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Subject: [Bug bootstrap/64271] Minimal patches to bootstrap on NetBSD
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64271

--- Comment #16 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Those patches actually were sent to the list, and I reviewed them, and got no
reply:
https://gcc.gnu.org/ml/libstdc++/2014-12/msg00069.html

I've committed them (after suitable updates) so the libstdc++ parts of this
should be finished now.

libcilkrts was dropped from GCC mainline. Is the libgfortran/configure patch
still relevant and needed?
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Subject: [Bug c++/93299] [9/10 Regression] ICE in tsubst_copy, at cp/pt.c:15779
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:

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Subject: [Bug testsuite/90565] [10 regression] test cases gcc.dg/uninit-18.c and uninit-pr90394-1-gimple.c broken as of r271460
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--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Looking at gcc-testresults, this seems to be long fixed, isn't it?
At least, I see both uninit-18.c and uninit-pr90394-1-gimple.c FAIL and not
FAIL pretty randomly in May, but certainly haven't seen them in recent
testresults, nor can reproduce with a cross-compiler to powerpc64le-linux and
valgrind is clean on it too.  So, can we close this?
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--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I think D bugs shouldn't block the release, shouldn't this be P4?
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:

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Subject: [Bug testsuite/90565] [10 regression] test cases gcc.dg/uninit-18.c and uninit-pr90394-1-gimple.c broken as of r271460
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Alexander Monakov <amonakov at gcc dot gnu.org> changed:

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--- Comment #4 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
I think this should have been fully resolved by PR90587 fix as indicated by
Vlad in his gcc-patches message:
https://gcc.gnu.org/ml/gcc-patches/2019-05/msg01600.html
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Subject: [Bug testsuite/90565] [10 regression] test cases gcc.dg/uninit-18.c and uninit-pr90394-1-gimple.c broken as of r271460
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:

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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Thanks.  Assuming it is fixed then, if not, please reopen.
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Subject: [Bug target/93312] New: [10 Regression] ICE: RTL check: expected code 'reg', have 'subreg' in rhs_regno, at rtl.h:1923
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93312

            Bug ID: 93312
           Summary: [10 Regression] ICE: RTL check: expected code 'reg',
                    have 'subreg' in rhs_regno, at rtl.h:1923
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Keywords: ice-checking, ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu
            Target: armv7a-hardfloat-linux-gnueabi

Created attachment 47672
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47672&action=edit
reduced testcase

This triggers while building libgcc2.o with RTL checking enabled.

$ cc1 -quiet -O testcase.c
during RTL pass: combine
testcase.c: In function 'foo':
testcase.c:8:1: internal compiler error: RTL check: expected code 'reg', have
'subreg' in rhs_regno, at rtl.h:1923
    8 | }
      | ^
0x6ca66c rtl_check_failed_code1(rtx_def const*, rtx_code, char const*, int,
char const*)
        /repo/gcc-trunk/gcc/rtl.c:879
0x7939ac rhs_regno
        /repo/gcc-trunk/gcc/rtl.h:1923
0x79fbf4 rhs_regno
        /repo/gcc-trunk/gcc/config/arm/arm.c:13807
0x79fbf4 clear_operation_p(rtx_def*, bool)
        /repo/gcc-trunk/gcc/config/arm/arm.c:13782
0x174b80a clear_multiple_operation_1
        /repo/gcc-trunk/gcc/config/arm/predicates.md:551
0x174b80a clear_multiple_operation(rtx_def*, machine_mode)
        /repo/gcc-trunk/gcc/config/arm/predicates.md:558
0x17aac6f recog_41
        /repo/gcc-trunk/gcc/config/arm/vfp.md:1989
0x183e0d7 recog(rtx_def*, rtx_insn*, int*)
        /repo/gcc-trunk/gcc/config/arm/arm-fixed.md:558
0x187516f recog_for_combine_1
        /repo/gcc-trunk/gcc/combine.c:11447
0x187fe9e recog_for_combine
        /repo/gcc-trunk/gcc/combine.c:11717
0x189569b try_combine
        /repo/gcc-trunk/gcc/combine.c:3656
0x1899a73 combine_instructions
        /repo/gcc-trunk/gcc/combine.c:1303
0x1899a73 rest_of_handle_combine
        /repo/gcc-trunk/gcc/combine.c:15059
0x1899a73 execute
        /repo/gcc-trunk/gcc/combine.c:15104
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

$ xgcc -v
Using built-in specs.
COLLECT_GCC=/repo/build-trunk-20200117170346-0ba6a850b59-checking-yes-rtl-df-extra-armv7a-hardfloat/./gcc/xgcc
Target: armv7a-hardfloat-linux-gnueabi
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--with-cloog --with-ppl --with-isl --with-float=hard --with-fpu=vfpv4
--with-arch=armv7-a --with-sysroot=/usr/armv7a-hardfloat-linux-gnueabi
--build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu
--target=armv7a-hardfloat-linux-gnueabi
--with-ld=/usr/bin/armv7a-hardfloat-linux-gnueabi-ld
--with-as=/usr/bin/armv7a-hardfloat-linux-gnueabi-as --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-20200117170346-0ba6a850b59-checking-yes-rtl-df-extra-armv7a-hardfloat
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 10.0.1 20200117 (experimental) (GCC)
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From: "herschel at hep dot phy.cam.ac.uk" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/93313] New: g++: internal compiler error: Segmentation fault signal terminated program cc1plus
Date: Fri, 17 Jan 2020 18:28:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93313

            Bug ID: 93313
           Summary: g++: internal compiler error: Segmentation fault
                    signal terminated program cc1plus
           Product: gcc
           Version: 9.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: herschel at hep dot phy.cam.ac.uk
  Target Milestone: ---

I would like to report an apparent bug in the c++ compiler: the compiler
segfaults when trying to compile my code, and it asks me to report the bug.

I wrote my program to evaluate a large expression (a polynomial). For smaller
expressions (200 KB), the program compiles without problems. However, for this
large expression (23 MB), the compiler segfaults.

The compiler isn't running out of RAM (it used only ~8GB before crashing, even
on a machine with ~200 GB RAM).

I have tried compiling on my laptop [gcc version 9.2.1 20191008 (Ubuntu
9.2.1-9ubuntu2)] as well as on a server [gcc version 7.3.1 20180303 (Red Hat
7.3.1-5) (GCC)].

Here is the output of "gcc -v":

Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/9/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none:hsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 9.2.1-9ubuntu2'
--with-bugurl=file:///usr/share/doc/gcc-9/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++,gm2 --prefix=/usr
--with-gcc-major-version-only --program-suffix=-9
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-plugin --enable-default-pie --with-system-zlib
--with-target-system-zlib=auto --enable-multiarch --disable-werror
--with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32
--enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none,hsa
--without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 9.2.1 20191008 (Ubuntu 9.2.1-9ubuntu2) 

Here is the command I used to try to compile my program:

g++ myexample.cpp -o myexample -I/home/herschel/usr/include/firefly/
-L/home/herschel/usr/lib/firefly -lfirefly -lgmp -lz -lflint -lgmpxx
-save-temps

Here is the complete output from gcc:

g++: internal compiler error: Segmentation fault signal terminated program
cc1plus
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-9/README.Bugs> for instructions.

The pre-processed file "myexample.ii" is large (25MB), for the reasons
explained at the start of this report. This makes it too large to include as an
attachment, and I have instead uploaded it to:

https://www.hep.phy.cam.ac.uk/~herschel/myexample.ii
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Subject: [Bug c++/93314] New: Invalid use of non-static data member causes ICE in gimplify_expr
Date: Fri, 17 Jan 2020 18:59:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93314

            Bug ID: 93314
           Summary: Invalid use of non-static data member causes ICE in
                    gimplify_expr
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Keywords: ice-on-invalid-code
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: language.lawyer at gmail dot com
  Target Milestone: ---

int main()
{
    struct S { int m; };
    return sizeof(char[S::m]);
}

$ g++ prog.cc

prog.cc: In function 'int main()':
prog.cc:4:27: internal compiler error: in gimplify_expr, at gimplify.c:14581
    4 |     return sizeof(char[S::m]);
      |                        ~~~^
0x5c6160 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        ../../source/gcc/gimplify.c:14581
0x9a7434 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        ../../source/gcc/gimplify.c:13885
0x9a7de0 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        ../../source/gcc/gimplify.c:13702
0x9aa19f gimplify_compound_lval
        ../../source/gcc/gimplify.c:3064
0x9a6c00 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        ../../source/gcc/gimplify.c:13533
0x9a7434 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        ../../source/gcc/gimplify.c:13885
0x9a7129 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        ../../source/gcc/gimplify.c:14348
0x9abfb0 internal_get_tmp_var
        ../../source/gcc/gimplify.c:619
0x9ac749 get_initialized_tmp_var(tree_node*, gimple**, gimple**, bool)
        ../../source/gcc/gimplify.c:674
0x9ac749 gimplify_save_expr
        ../../source/gcc/gimplify.c:6072
0x9a7621 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        ../../source/gcc/gimplify.c:13881
0x9a7434 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        ../../source/gcc/gimplify.c:13885
0x9a7129 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        ../../source/gcc/gimplify.c:14348
0x9a7434 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        ../../source/gcc/gimplify.c:13885
0x9b1ecb gimplify_modify_expr
        ../../source/gcc/gimplify.c:5765
0x9a73a2 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        ../../source/gcc/gimplify.c:13581
0x9acc8e gimplify_stmt(tree_node**, gimple**)
        ../../source/gcc/gimplify.c:6822
0x9acc8e gimplify_and_add(tree_node*, gimple**)
        ../../source/gcc/gimplify.c:486
0x9acc8e gimplify_return_expr
        ../../source/gcc/gimplify.c:1667
0x9a8303 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        ../../source/gcc/gimplify.c:13842
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

(https://wandbox.org/permlink/GNNTjXAK2pQ5clUt)

I've selectively checked about some of g++ versions, from 4.4.7 to HEAD, on
wandbox.org. They're all crashing, just segfaulting before 5.1.0 and ICEing in
gimplify_expr starting from 5.1.0.
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Subject: [Bug c++/92542] [10 Regression] ICE with class template argument deduction following typo
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92542

--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Paolo Carlini <paolo@gcc.gnu.org>:

https://gcc.gnu.org/g:4c9e5b02f08b1b02f9b498c5121d06dea3f2c1c4

commit r10-6055-g4c9e5b02f08b1b02f9b498c5121d06dea3f2c1c4
Author: Paolo Carlini <paolo.carlini@oracle.com>
Date:   Fri Jan 17 20:02:21 2020 +0100

    Add testcase of PR c++/92542, already fixed.

        PR c++/92542
        * g++.dg/pr92542.C: New.
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Subject: [Bug c++/92542] [10 Regression] ICE with class template argument deduction following typo
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92542

--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Paolo Carlini <paolo@gcc.gnu.org>:

https://gcc.gnu.org/g:7e45138702a9c26b00d25db07f92a271b054e304

commit r10-6056-g7e45138702a9c26b00d25db07f92a271b054e304
Author: Paolo Carlini <paolo.carlini@oracle.com>
Date:   Fri Jan 17 20:03:58 2020 +0100

    Add testcase of PR c++/92542, already fixed.

        PR c++/92542
        * g++.dg/pr92542.C: New.
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Subject: [Bug target/93312] [10 Regression] ICE: RTL check: expected code 'reg', have 'subreg' in rhs_regno, at rtl.h:1923
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93312

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

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----------------------------------------------------------------------------
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   Last reconfirmed|                            |2020-01-17
                 CC|                            |jakub at gcc dot gnu.org
   Target Milestone|---                         |10.0
     Ever confirmed|0                           |1

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
This got broken with r10-6012-g9722215a027b68651c3c7a8af9204d033197e9c0
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Subject: [Bug c++/92542] [10 Regression] ICE with class template argument deduction following typo
Date: Fri, 17 Jan 2020 19:06:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92542

Paolo Carlini <paolo.carlini at oracle dot com> changed:

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--- Comment #5 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Thanks Jon.
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Subject: [Bug target/93312] [10 Regression] ICE: RTL check: expected code 'reg', have 'subreg' in rhs_regno, at rtl.h:1923
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93312

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

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--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 47673
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47673&action=edit
gcc10-pr93312.patch

Untested fix.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93286

--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-9 branch has been updated by Jason Merrill
<jason@gcc.gnu.org>:

https://gcc.gnu.org/g:5c7938eb3f1a116b1cf9a28090f2cc5e08814ce4

commit r9-8140-g5c7938eb3f1a116b1cf9a28090f2cc5e08814ce4
Author: Jason Merrill <jason@redhat.com>
Date:   Thu Jan 16 16:55:39 2020 -0500

    PR c++/93286 - ICE with __is_constructible and variadic template.

    Here we had been recursing in tsubst_copy_and_build if type2 was a
TREE_LIST
    because that function knew how to deal with pack expansions, and tsubst
    didn't.  But tsubst_copy_and_build expects to be dealing with expressions,
    so we crash when trying to convert_from_reference a type.

        * pt.c (tsubst) [TREE_LIST]: Handle pack expansion.
        (tsubst_copy_and_build) [TRAIT_EXPR]: Always use tsubst for type2.
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Subject: [Bug c++/93314] Invalid use of non-static data member causes ICE in gimplify_expr
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93314

--- Comment #1 from Language Lawyer <language.lawyer at gmail dot com> ---
GCC thinks that `char[S::m]` is VLA (because the lvalue-to-rvalue conversion on
`S::m` lvalue doesn't look like a constant expression) and tries to move the
evaluation of `sizeof(char[S::m])` to run time.

$ g++ prog.cc -pedantic

prog.cc: In function 'int main()':
prog.cc:4:28: warning: ISO C++ forbids variable length array [-Wvla]
    4 |     return sizeof(char[S::m]);
      |                            ^
prog.cc:4:27: internal compiler error: in gimplify_expr, at gimplify.c:14581
    4 |     return sizeof(char[S::m]);
      |
...
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Subject: [Bug c++/92531] [9 Regression] ICE in uses_template_parms, at cp/pt.c:10471
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--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-9 branch has been updated by Jason Merrill
<jason@gcc.gnu.org>:

https://gcc.gnu.org/g:3815f211649cd5c8a277348aa71c9c18bc5ed070

commit r9-8141-g3815f211649cd5c8a277348aa71c9c18bc5ed070
Author: Jason Merrill <jason@redhat.com>
Date:   Fri Jan 17 08:37:49 2020 -0500

    PR c++/92531 - ICE with noexcept(lambda).

    This was failing because uses_template_parms didn't recognize LAMBDA_EXPR
as
    a kind of expression.  Instead of trying to enumerate all the different
    varieties of expression and then aborting if what's left isn't
    error_mark_node, let's handle error_mark_node and then assume anything else
    is an expression.

        * pt.c (uses_template_parms): Don't try to enumerate all the
        expression cases.
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Subject: [Bug libfortran/90374] Fortran 2018: Support d0.d, e0.d, es0.d, en0.d, g0.d and ew.d e0 edit descriptors for output
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--- Comment #28 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jerry DeLisle <jvdelisle@gcc.gnu.org>:

https://gcc.gnu.org/g:82033483fd74b1dcedab416d98673e212258498d

commit r10-6057-g82033483fd74b1dcedab416d98673e212258498d
Author: Jerry DeLisle <jvdelisle@gcc.gnu.org>
Date:   Fri Jan 17 11:26:10 2020 -0800

    PR90374 Zero width format specifiers.

        PR libfortran/90374
        * io/format.c (parse_format_list): Zero width not allowed with
        FMT_D.
        * io/write_float.def (build_float_string): Include range of
        higher exponent values that require wider width.
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Subject: [Bug c++/92531] [9 Regression] ICE in uses_template_parms, at cp/pt.c:10471
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Jason Merrill <jason at gcc dot gnu.org> changed:

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--- Comment #7 from Jason Merrill <jason at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug c++/93314] Invalid use of non-static data member causes ICE in gimplify_expr
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93314

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2020-01-17
     Ever confirmed|0                           |1
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From: "ro at CeBiTec dot Uni-Bielefeld.DE" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/92303] [10 regression] gcc.target/sparc/ultrasp12.c times out
Date: Fri, 17 Jan 2020 19:53:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92303

--- Comment #3 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> ---
> --- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
> There's no RA commits in that range, further bisection is needed.

Done now.  I've found r272742 to be the culprit:

2019-06-27  Richard Biener  <rguenther@suse.de>

        * tree-ssa-sccvn.c (vn_reference_lookup_3): Encode valueized RHS.

At r272740,

cc1 -fpreprocessed ultrasp12.i -mptr64 -mstack-bias -mno-v8plus -quiet -m64
-mcpu=ultrasparc -mvis -O2 -o ultrasp12.s

takes less than a second, at r272740 the compilation never terminates.
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To: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>, gcc-bugs@gcc.gnu.org, NetBSD Toolchain and Build Technical Discussion List <tech-toolchain@netbsd.org>
References: <bug-64271-4@http.gcc.gnu.org/bugzilla/> <bug-64271-4-B30RazXobL@http.gcc.gnu.org/bugzilla/>
From: Kamil Rytarowski <n54@gmx.com>
Subject: Re: [Bug bootstrap/64271] Minimal patches to bootstrap on NetBSD
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On 17.01.2020 18:15, redi at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64271
>
> --- Comment #16 from Jonathan Wakely <redi at gcc dot gnu.org> ---
> Those patches actually were sent to the list, and I reviewed them, and got no
> reply:
> https://gcc.gnu.org/ml/libstdc++/2014-12/msg00069.html
>

I'm sorry for this, it was probably overlooked.

> I've committed them (after suitable updates) so the libstdc++ parts of this
> should be finished now.
>

Thanks!

> libcilkrts was dropped from GCC mainline. Is the libgfortran/configure patch
> still relevant and needed?
>

We still keep this GTHREAD_USE_WEAK patch locally, but I have no idea
what is/was the original intention with it and who authored it.

The earliest note on it I can see in pkgsrc/lang/gcc47 from 2012/04/16.

Adding TO: tech-toolchain@ as someone could shed light on it.


^ permalink raw reply	[flat|nested] 2+ messages in thread

* [Bug target/93274] target_clones produces symbols with random digits with -fPIC
       [not found] <bug-93274-4@http.gcc.gnu.org/bugzilla/>
  2020-01-16  9:14 ` [Bug target/93274] target_clones produces symbols with random digits with -fPIC marxin at gcc dot gnu.org
@ 2020-03-25 10:04 ` cvs-commit at gcc dot gnu.org
  1 sibling, 0 replies; 2+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2020-03-25 10:04 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93274

--- Comment #8 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Martin Liska <marxin@gcc.gnu.org>:

https://gcc.gnu.org/g:724ec02c2c6d1b79788be77f68ebb6ca7b5b6acd

commit r10-7372-g724ec02c2c6d1b79788be77f68ebb6ca7b5b6acd
Author: Martin Liska <mliska@suse.cz>
Date:   Wed Mar 25 11:03:39 2020 +0100

    Make target_clones resolver fn static if possible.

            PR target/93274
            PR ipa/94271
            * config/i386/i386-features.c (make_resolver_func): Drop
            public flag for resolver.
            * config/rs6000/rs6000.c (make_resolver_func): Add comdat
            group for resolver and drop public flag if possible.
            * multiple_target.c (create_dispatcher_calls): Drop unique_name
            and resolution as we want to enable LTO privatization of the
default
            symbol.
            PR target/93274
            PR ipa/94271
            * gcc.target/i386/pr81213-2.c: New test.
            * gcc.target/i386/pr81213.c: Add additional source.
            * gcc.dg/lto/pr94271_0.c: New test.
            * gcc.dg/lto/pr94271_1.c: New test.

^ permalink raw reply	[flat|nested] 2+ messages in thread

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