[Bug bootstrap/66448] New: [6 Regression] Bootstrap fails on darwin after r224161

[Bug bootstrap/66448] New: [6 Regression] Bootstrap fails on darwin after r224161

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66448

            Bug ID: 66448
           Summary: [6 Regression] Bootstrap fails on darwin after r224161
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dominiq at lps dot ens.fr
                CC: aldyh at gcc dot gnu.org, iains at gcc dot gnu.org
  Target Milestone: ---
              Host: x86_64-apple-darwin14
            Target: x86_64-apple-darwin14
             Build: x86_64-apple-darwin14

Bootstrap fails on darwin after r224161

...
checking for suffix of object files... configure: error: in
`/opt/gcc/p_build/x86_64-apple-darwin14.3.0/libgcc':
configure: error: cannot compute suffix of object files: cannot compile
See `config.log' for more details.
...

configure:3675: /opt/gcc/p_build/./gcc/xgcc -B/opt/gcc/p_build/./gcc/
-B/opt/gcc/gcc6p-224161p4/x86_64-apple-darwin14.3.0/bin/
-B/opt/gcc/gcc6p-224161p4/x86_64-apple-darwin14.3.0/lib/ -isystem
/opt/gcc/gcc6p-224161p4/x86_64-apple-darwin14.3.0/include -isystem
/opt/gcc/gcc6p-224161p4/x86_64-apple-darwin14.3.0/sys-include    -c -g -O2 
conftest.c >&5
<built-in>: internal compiler error: Segmentation fault: 11

<built-in>: internal compiler error: Abort trap: 6
xgcc: internal compiler error: Abort trap: 6 (program cc1)

[Bug bootstrap/66448] [6 Regression] Bootstrap fails on darwin after r224161

[iains at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66448

--- Comment #1 from Iain Sandoe <iains at gcc dot gnu.org> ---
Created attachment 35710
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35710&action=edit
declare "extern int __CFConstantStringClassReference" lazily

There seem to be three issues triggered by 224161

1.  Debug is not initialised when the built-ins are initialised, therefore any
attempt to declare a variable at that time causes the segv. (hash table is not
present).

 * at present, *darwin* declares "extern int
__CFConstantStringClassReference[]" at the time that the CFString built-in is
initialised.

 - on the basis that it's not clear *if* such early declarations are allowed,
I've made a patch that makes the declaration lazily (when the fist use of the
built-in occurs).

 This works around the reported crash (one could also use DECL_SOURCE_LOCATION
!= BUILTINS_LOCATION as an additional test at passes.c:338, if built-ins *are*
supposed to be allowed to declare variables.

… however ...

====

2. Once (1) is fixed, bootstrap then fails with:

/GCC/gcc-trunk/gcc/ipa-pure-const.c:1640:1: error:
‘{anonymous}::pass_ipa_pure_const::pass_ipa_pure_const(gcc::context*)’ defined
but not used [-Werror=unused-function]
 pass_ipa_pure_const::

A --disable-werror boostrap completes, but there are a number of constructors
and destructors that report "declared but not used". AFAICT, it's only
constructors/destructors.

This is occurring at stage #2, and I thought maybe that the stage#1 compiler
could have been mis-compiled by the bootstrap; however, gcc-4.9, 5.1 and clang
(xcode 5.1.1) bootstraps all give the same result.

… additional info …

=====

3. During bootstrap (and in the test suite on the --disable-werror build) there
are a large number of warnings from ld64 (of course, this might be a limitation
of ld64, but for the record):

warning: invalid DWARF generated by the compiler: DIE 0x000002f7 has multiple 
AT_location attributes in
'/GCC/ml/gcc-trunk-xtools/x86_64-apple-darwin12/libgcc/enable-execute-stack_s.o'.
warning: invalid DWARF generated by the compiler: DIE 0x00000317 has multiple 
AT_location attributes in
'/GCC/ml/gcc-trunk-xtools/x86_64-apple-darwin12/libgcc/enable-execute-stack_s.o'.
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Subject: [Bug bootstrap/66448] [6 Regression] Bootstrap fails on darwin after r224161
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idf448

Iain Sandoe <iains at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|x86_64-apple-darwin14       |*-apple-darwin*
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-06-07
               Host|x86_64-apple-darwin14       |*-apple-darwin*
     Ever confirmed|0                           |1
              Build|x86_64-apple-darwin14       |*-apple-darwin*

[Bug bootstrap/66448] [6 Regression] Bootstrap fails on darwin after r224161

[aldyh at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66448

Aldy Hernandez <aldyh at gcc dot gnu.org> changed:

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

--- Comment #2 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---

> 2. Once (1) is fixed, bootstrap then fails with:
> 
> /GCC/gcc-trunk/gcc/ipa-pure-const.c:1640:1: error:
> ‘{anonymous}::pass_ipa_pure_const::pass_ipa_pure_const(gcc::context*)’
> defined but not used [-Werror=unused-function]
>  pass_ipa_pure_const::
> 
> A --disable-werror boostrap completes, but there are a number of
> constructors and destructors that report "declared but not used". AFAICT,
> it's only constructors/destructors.
> 
> This is occurring at stage #2, and I thought maybe that the stage#1 compiler
> could have been mis-compiled by the bootstrap; however, gcc-4.9, 5.1 and
> clang (xcode 5.1.1) bootstraps all give the same result.

Jason, is pass_ipa_pure_const::pass_ipa_pure_const() really declared but not
used?

If so, can we mark it ATTRIBUTE_UNSUED or is there a more generic way of fixing
this?
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Subject: [Bug bootstrap/66448] [6 Regression] Bootstrap fails on darwin after r224161
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66448

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Aldy Hernandez from comment #2)
> > 2. Once (1) is fixed, bootstrap then fails with:
> > 
> > /GCC/gcc-trunk/gcc/ipa-pure-const.c:1640:1: error:
> > ‘{anonymous}::pass_ipa_pure_const::pass_ipa_pure_const(gcc::context*)’
> > defined but not used [-Werror=unused-function]
> >  pass_ipa_pure_const::
> > 
> > A --disable-werror boostrap completes, but there are a number of
> > constructors and destructors that report "declared but not used". AFAICT,
> > it's only constructors/destructors.
> > 
> > This is occurring at stage #2, and I thought maybe that the stage#1 compiler
> > could have been mis-compiled by the bootstrap; however, gcc-4.9, 5.1 and
> > clang (xcode 5.1.1) bootstraps all give the same result.
> 
> Jason, is pass_ipa_pure_const::pass_ipa_pure_const() really declared but not
> used?

I bet a drink that it is an incharge vs outofcharge construct/deconstruct
issue. Darwin does not support aliases so the function itself is cloned. 


> 
> If so, can we mark it ATTRIBUTE_UNSUED or is there a more generic way of
> fixing this?
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Subject: [Bug tree-optimization/66442] [6 regression] FAIL: gcc.dg/autopar/pr46885.c (test for excess errors)
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idf442

--- Comment #4 from Andreas Schwab <schwab@linux-m68k.org> ---
Fixes the test case on m68k.

[Bug bootstrap/66448] [6 Regression] Bootstrap fails on darwin after r224161

[iains at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66448

--- Comment #4 from Iain Sandoe <iains at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #3)
> (In reply to Aldy Hernandez from comment #2)
> > > 2. Once (1) is fixed, bootstrap then fails with:
> > > 
> > > /GCC/gcc-trunk/gcc/ipa-pure-const.c:1640:1: error:
> > > ‘{anonymous}::pass_ipa_pure_const::pass_ipa_pure_const(gcc::context*)’
> > > defined but not used [-Werror=unused-function]
> > >  pass_ipa_pure_const::
> > > 
> > > A --disable-werror boostrap completes, but there are a number of
> > > constructors and destructors that report "declared but not used". AFAICT,
> > > it's only constructors/destructors.
> > > 
> > > This is occurring at stage #2, and I thought maybe that the stage#1 compiler
> > > could have been mis-compiled by the bootstrap; however, gcc-4.9, 5.1 and
> > > clang (xcode 5.1.1) bootstraps all give the same result.
> > 
> > Jason, is pass_ipa_pure_const::pass_ipa_pure_const() really declared but not
> > used?
> 
> I bet a drink that it is an incharge vs outofcharge construct/deconstruct
> issue. Darwin does not support aliases so the function itself is cloned. 

*sigh*, that seems believable - although I thought we'd ironed out most of the
alias/no-alias issues when dealing with the ipa-icf stuff last year.

This assessment is also likely consistent with duplicate debug information
being reported.

So perhaps there are multiple entries and (somehow) only one is marked as
"used"?
(if there's something specific needed debug-wise that needs a Darwin system let
us know and we'll try to extract what's needed).
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From: "sebastiano.vigna at unimi dot it" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/66348] Simple loop never exits with -O1, exits with -O0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idf348

--- Comment #13 from Sebastiano Vigna <sebastiano.vigna at unimi dot it> ---
I can confirm that compiling/running with ubsan and asan no problem is
reported. The bug does not show up.

[Bug bootstrap/66448] [6 Regression] Bootstrap fails on darwin after r224161

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66448

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.0.1

[Bug bootstrap/66448] [6 Regression] Bootstrap fails on darwin after r224161

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66448

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.0.1                       |6.0

[Bug bootstrap/66448] [6 Regression] Bootstrap fails on darwin after r224161

[aldyh at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66448

--- Comment #5 from Aldy Hernandez <aldyh at redhat dot com> ---
I don't have access to a Darwin box. Could you provide a preprocessed file so I
can try to reproduce the defined but not used problem on a cross build?

Also, what triplet?

Thanks.

On Jun 7, 2015 4:09 AM, "iains at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
wrote:
>
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66448 
>
> --- Comment #1 from Iain Sandoe <iains at gcc dot gnu.org> --- 
> Created attachment 35710 
>   --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35710&action=edit 
> declare "extern int __CFConstantStringClassReference" lazily 
>
> There seem to be three issues triggered by 224161 
>
> 1.  Debug is not initialised when the built-ins are initialised, therefore any 
> attempt to declare a variable at that time causes the segv. (hash table is not 
> present). 
>
> * at present, *darwin* declares "extern int 
> __CFConstantStringClassReference[]" at the time that the CFString built-in is 
> initialised. 
>
> - on the basis that it's not clear *if* such early declarations are allowed, 
> I've made a patch that makes the declaration lazily (when the fist use of the 
> built-in occurs). 
>
> This works around the reported crash (one could also use DECL_SOURCE_LOCATION 
> != BUILTINS_LOCATION as an additional test at passes.c:338, if built-ins *are* 
> supposed to be allowed to declare variables. 
>
> … however ... 
>
> ==== 
>
> 2. Once (1) is fixed, bootstrap then fails with: 
>
> /GCC/gcc-trunk/gcc/ipa-pure-const.c:1640:1: error: 
> ‘{anonymous}::pass_ipa_pure_const::pass_ipa_pure_const(gcc::context*)’ defined 
> but not used [-Werror=unused-function] 
> pass_ipa_pure_const:: 
>
> A --disable-werror boostrap completes, but there are a number of constructors 
> and destructors that report "declared but not used". AFAICT, it's only 
> constructors/destructors. 
>
> This is occurring at stage #2, and I thought maybe that the stage#1 compiler 
> could have been mis-compiled by the bootstrap; however, gcc-4.9, 5.1 and clang 
> (xcode 5.1.1) bootstraps all give the same result. 
>
> … additional info … 
>
> ===== 
>
> 3. During bootstrap (and in the test suite on the --disable-werror build) there 
> are a large number of warnings from ld64 (of course, this might be a limitation 
> of ld64, but for the record): 
>
> warning: invalid DWARF generated by the compiler: DIE 0x000002f7 has multiple 
> AT_location attributes in 
> '/GCC/ml/gcc-trunk-xtools/x86_64-apple-darwin12/libgcc/enable-execute-stack_s.o'. 
> warning: invalid DWARF generated by the compiler: DIE 0x00000317 has multiple 
> AT_location attributes in 
> '/GCC/ml/gcc-trunk-xtools/x86_64-apple-darwin12/libgcc/enable-execute-stack_s.o'. 
>
> -- 
> You are receiving this mail because: 
> You are on the CC list for the bug.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idf252

--- Comment #6 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
cse.c:fold_rtx is miscompiled by the stage2 compiler, more precisely in:

          if (const_arg1 != 0 && CONST_INT_P (const_arg1)
              && INTVAL (const_arg1) < 0
              /* This used to test

                 -INTVAL (const_arg1) >= 0

                 But The Sun V5.0 compilers mis-compiled that test.  So
                 instead we test for the problematic value in a more direct
                 manner and hope the Sun compilers get it correct.  */
              && INTVAL (const_arg1) !                ((HOST_WIDE_INT) 1 << (HOST_BITS_PER_WIDE_INT - 1))
              && REG_P (folded_arg1))
            {
              rtx new_const = GEN_INT (-INTVAL (const_arg1));

the -INTVAL is miscompiled:

=> 0x00a94d58 <+4884>:  subcc  %g0, %o3, %o2
   0x00a94d5c <+4888>:  clr  %o0
   0x00a94d60 <+4892>:  call  0x35044c <gen_rtx_CONST_INT(machine_mode, long
long)>
   0x00a94d64 <+4896>:  subc  %g0, %o2, %o1

%o2 is wrongly clobbered by the first subtraction.

[Bug bootstrap/66448] [6 Regression] Bootstrap fails on darwin after r224161

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66448

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |WAITING

--- Comment #6 from Jason Merrill <jason at gcc dot gnu.org> ---
Waiting for preprocessed testcases.

[Bug bootstrap/66448] [6 Regression] Bootstrap fails on darwin after r224161

[iains at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66448

--- Comment #7 from Iain Sandoe <iains at gcc dot gnu.org> ---
Created attachment 35717
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35717&action=edit
pre-proc file for ipa-pure-const.c

svn rev. 224236 + patch to defer declaration of the extern.

If this is an issue with alias support / no alias support, ISTR that Honza has
some trick to turn it off on Linux which makes testing easier.

--- c/l

/GCC/ml/gcc-trunk-apple/./prev-gcc/xg++ -B/GCC/ml/gcc-trunk-apple/./prev-gcc/
-B/compilers/gcc-trunk/x86_64-apple-darwin12/bin/ -nostdinc++
-B/GCC/ml/gcc-trunk-apple/prev-x86_64-apple-darwin12/libstdc++-v3/src/.libs
-B/GCC/ml/gcc-trunk-apple/prev-x86_64-apple-darwin12/libstdc++-v3/libsupc++/.libs

-I/GCC/ml/gcc-trunk-apple/prev-x86_64-apple-darwin12/libstdc++-v3/include/x86_64-apple-darwin12
 -I/GCC/ml/gcc-trunk-apple/prev-x86_64-apple-darwin12/libstdc++-v3/include 
-I/GCC/gcc-trunk/libstdc++-v3/libsupc++
-L/GCC/ml/gcc-trunk-apple/prev-x86_64-apple-darwin12/libstdc++-v3/src/.libs
-L/GCC/ml/gcc-trunk-apple/prev-x86_64-apple-darwin12/libstdc++-v3/libsupc++/.libs
-fno-PIE -c   -g -O2   -gtoggle -DIN_GCC    -fno-exceptions -fno-rtti
-fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings
-Wcast-qual -Wmissing-format-attribute -Woverloaded-virtual -pedantic
-Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Werror -fno-common
 -DHAVE_CONFIG_H -I. -I. -I/GCC/gcc-trunk/gcc -I/GCC/gcc-trunk/gcc/.
-I/GCC/gcc-trunk/gcc/../include -I./../intl
-I/GCC/gcc-trunk/gcc/../libcpp/include -I/host/clang42//include 
-I/GCC/gcc-trunk/gcc/../libdecnumber -I/GCC/gcc-trunk/gcc/../libdecnumber/dpd
-I../libdecnumber -I/GCC/gcc-trunk/gcc/../libbacktrace  -I/host/clang42/include
-o ipa-pure-const.o -MT ipa-pure-const.o -MMD -MP -MF
./.deps/ipa-pure-const.TPo /GCC/gcc-trunk/gcc/ipa-pure-const.c -save-temps

-- response.

/GCC/gcc-trunk/gcc/ipa-pure-const.c:1640:1: error:
‘{anonymous}::pass_ipa_pure_const::pass_ipa_pure_const(gcc::context*)’ defined
but not used [-Werror=unused-function]
 pass_ipa_pure_const::pass_ipa_pure_const(gcc::context *ctxt)
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Subject: [Bug bootstrap/66448] [6 Regression] Bootstrap fails on darwin after r224161
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idf448

Iain Sandoe <iains at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |NEW

[Bug bootstrap/66448] [6 Regression] Bootstrap fails on darwin after r224161

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66448

--- Comment #9 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> Created attachment 35718
>   --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35718&action=edit
> Tentative patch for issue #3

The patch does not fix the

../../work/gcc/ipa-pure-const.c:1636:1: error:
'{anonymous}::pass_ipa_pure_const::pass_ipa_pure_const(gcc::context*)' defined
but not used [-Werror=unused-function]

issue.

[Bug bootstrap/66448] [6 Regression] Bootstrap fails on darwin after r224161

[aldyh at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66448

--- Comment #10 from Aldy Hernandez <aldyh at redhat dot com> ---
It's not supposed to. It's for issue three as stated.

On Jun 9, 2015 4:36 AM, "dominiq at lps dot ens.fr" <gcc-bugzilla@gcc.gnu.org>
wrote:
>
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66448 
>
> --- Comment #9 from Dominique d'Humieres <dominiq at lps dot ens.fr> --- 
> > Created attachment 35718 
> >   --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35718&action=edit 
> > Tentative patch for issue #3 
>
> The patch does not fix the 
>
> ../../work/gcc/ipa-pure-const.c:1636:1: error: 
> '{anonymous}::pass_ipa_pure_const::pass_ipa_pure_const(gcc::context*)' defined 
> but not used [-Werror=unused-function] 
>
> issue. 
>
> -- 
> You are receiving this mail because: 
> You are on the CC list for the bug.
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Subject: [Bug debug/66468] [6 Regression] ICE in in check_die, at dwarf2out.c:5719
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66468

Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:

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

--- Comment #2 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
The testcase is invalid:

markus@x4 testc % g++ -r -nostdlib a.ii c.ii e.ii -g -O2 -flto
a.ii:21:8: warning: ‘Run’ violates the C++ One Definition Rule  [-Wodr]
   void Run (Point &) const;
        ^
e.ii:25:1: note: return value type mismatch
 Optimizer::Run (Point &) const
 ^
e.ii:25:1: note: type ‘float’ should match type ‘void’
e.ii:25:1: note: ‘Run’ was previously declared here
e.ii: In member function ‘__base_dtor ’:
e.ii:28:1: internal compiler error: in check_die, at dwarf2out.c:5712
 }
 ^
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Subject: [Bug debug/66468] [6 Regression] ICE in in check_die, at dwarf2out.c:5719
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66468

--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Markus Trippelsdorf from comment #2)
> The testcase is invalid:
> 
> markus@x4 testc % g++ -r -nostdlib a.ii c.ii e.ii -g -O2 -flto
> a.ii:21:8: warning: ‘Run’ violates the C++ One Definition Rule  [-Wodr]
>    void Run (Point &) const;
>         ^
> e.ii:25:1: note: return value type mismatch
>  Optimizer::Run (Point &) const
>  ^
> e.ii:25:1: note: type ‘float’ should match type ‘void’
> e.ii:25:1: note: ‘Run’ was previously declared here
> e.ii: In member function ‘__base_dtor ’:
> e.ii:28:1: internal compiler error: in check_die, at dwarf2out.c:5712
>  }
>  ^

You are right. However, I guess we should not ICE?

Martin
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idf030

--- Comment #14 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Tue Jun  9 08:50:00 2015
New Revision: 224273

URL: https://gcc.gnu.org/viewcvs?rev"4273&root=gcc&view=rev
Log:
        PR libstdc++/66030
        * config/abi/pre/gnu.ver: Export codecvt_byname and codecvt symbols
        for mingw32.

Modified:
    trunk/libstdc++-v3/ChangeLog
    trunk/libstdc++-v3/config/abi/pre/gnu.ver

[Bug bootstrap/66448] [6 Regression] Bootstrap fails on darwin after r224161

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66448

--- Comment #13 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Tue Jun  9 14:51:30 2015
New Revision: 224285

URL: https://gcc.gnu.org/viewcvs?rev=224285&root=gcc&view=rev
Log:
        PR bootstrap/66448
        * toplev.c (check_global_declaration): Don't warn about a clone.

Added:
    trunk/gcc/testsuite/g++.dg/warn/Wunused-function1.C
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/toplev.c

[Bug bootstrap/66448] [6 Regression] Bootstrap fails on darwin after r224161

[aldyh at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66448

--- Comment #14 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
Created attachment 35734
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35734&action=edit
Patch to ICE on other duplicate DW_AT_ attributes

On 06/09/2015 08:00 AM, iains at gcc dot gnu.org wrote:
> So .. things are *very* much improved, thanks!

Awesome!

> (at least no reports during bootstrap),
> but there's still quite a bit of fallout in the testsuite (many more failing
> tests than listed below, these are just examples):
> 
> FAIL: gcc.c-torture/execute/20020412-1.c   -O3 -g  (test for excess errors)
> FAIL: gcc.c-torture/execute/20040308-1.c   -O3 -g  (test for excess errors)
> FAIL: gcc.c-torture/execute/20070919-1.c   -O3 -g  (test for excess errors)
> FAIL: gcc.dg/torture/pr8081.c   -O3 -g  (test for excess errors)
> <etc>
> 
> (usually several) instances of:
> warning: invalid DWARF generated by the compiler: DIE 0x0000018b has multiple
> AT_decl_file attributes in
> '/var/folders/tj/17r7407j14d324dzf67cnvxm000114/T//ccSyKR0x.o'.

I can't reproduce any of these with a cross compiler.  I'm building a cross
with:

--enable-languages=c,c++ --disable-bootstrap --disable-multilib
--target=i686-darwin

...but I still can't get cc1plus to trigger any ICE with the attached patch.

> 
> warning: invalid DWARF generated by the compiler: DIE 0x0000015d has multiple
> AT_decl_line attributes in
> '/var/folders/tj/17r7407j14d324dzf67cnvxm000114/T//cccckVUY.o'.
> 
> FAIL: c-c++-common/cilk-plus/CK/cilk-for-2.c  -g  (test for excess errors)
> FAIL: c-c++-common/cilk-plus/CK/cilk-fors.c  -g  (test for excess errors)
> FAIL: c-c++-common/cilk-plus/CK/cilk_for_grain.c  -g  (test for excess errors)
> FAIL: c-c++-common/cilk-plus/CK/cilk_for_ptr_iter.c  -g  (test for excess
> errors)
> FAIL: c-c++-common/cilk-plus/CK/nested_cilk_for.c  -g  (test for excess errors)
> <etc>
> also plugin tests.
> 
> (many) instances of:
> warning: invalid DWARF generated by the compiler: DIE 0x00000176 has multiple
> AT_artificial attributes in
> '/var/folders/tj/17r7407j14d324dzf67cnvxm000114/T//ccNJ6qak.o'.

Similarly here.

The attached patch adds ICEs for duplicate
DW_AT_{artificial,decl_line,decl_file} tags.  Since I'm flying blind here,
would you mind finding for which files we trigger ICEs and attach the
preprocessed files so I can reproduce with a cc1/cc1plus?  I assume just one of
each type will do.

Thanks.

[Bug bootstrap/66448] [6 Regression] Bootstrap fails on darwin after r224161

[iains at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66448

--- Comment #15 from Iain Sandoe <iains at gcc dot gnu.org> ---
(In reply to Aldy Hernandez from comment #14)
> Created attachment 35734 [details]
> Patch to ICE on other duplicate DW_AT_ attributes

> I can't reproduce any of these with a cross compiler.  I'm building a cross
> with:
> 
> --enable-languages=c,c++ --disable-bootstrap --disable-multilib
> --target=i686-darwin

The triple for the platform I'm testing on is :  x86_64-apple-darwin12

I doubt that i686/x86_64 is significant since the errors show on both multilib
variants.

However, I'd avoid the default version - and suggest at least
xxx-apple-darwin10.

> ...but I still can't get cc1plus to trigger any ICE with the attached patch.

me neither - nevertheless...

> > warning: invalid DWARF generated by the compiler: DIE 0x00000176 has multiple
> > AT_artificial attributes in
> > '/var/folders/tj/17r7407j14d324dzf67cnvxm000114/T//ccNJ6qak.o'.
> 
> Similarly here.
> 
> The attached patch adds ICEs for duplicate
> DW_AT_{artificial,decl_line,decl_file} tags.  Since I'm flying blind here,
> would you mind finding for which files we trigger ICEs and attach the
> preprocessed files so I can reproduce with a cc1/cc1plus?  I assume just one
> of each type will do.

OK. so … the ICEs don't fire - but, nevertheless, the output seems to be
incorrect.

I'll attach the intermediate files in a follow-on post.

for the case of:
./gcc/xgcc -Bgcc
/GCC/gcc-trunk/gcc/testsuite/gcc.c-torture/execute/20020412-1.c  -m64   -O3 -g 
-o t -save-temps

dwarfdump --verify 20020412-1.o
----------------------------------------------------------------------
 File: 20020412-1.o (x86_64)
----------------------------------------------------------------------
Verifying Compile Unit Header chain... ok
Verifying .debug_info... 
error: Range is not in parent
  BLCK {0x000001da}: [0x0000000000000190 - 0x0000000000000204) ERROR
0x0000020a: contains multiple  AT_decl_file attributes.
ERROR 0x0000020a: contains multiple  AT_decl_line attributes.
ERROR 0x0000020a: contains multiple  AT_decl_file attributes.
ERROR 0x0000020a: contains multiple  AT_decl_line attributes.
ERROR 0x0000028d: contains multiple  AT_decl_file attributes.
ERROR 0x0000028d: contains multiple  AT_decl_line attributes.

======

using binutils objdump (which groks mach-o)
… although I realise you don't have a cross-assembler (although I'm working on
that too ;) )

Contents of the .debug_info section:

  Compilation Unit @ offset 0x0:
   Length:        0x39d (32-bit)
   Version:       2
   Abbrev Offset: 0x0

<snip>

    <209>   DW_AT_const_value : 5
 <2><20a>: Abbrev Number: 11 (DW_TAG_structure_type)
    <20b>   DW_AT_decl_file   : 1
    <20c>   DW_AT_decl_line   : 43
    <20d>   DW_AT_decl_file   : 1
    <20e>   DW_AT_decl_line   : 43
    <20f>   DW_AT_decl_file   : 1
    <210>   DW_AT_decl_line   : 43
    <211>   DW_AT_sibling     : <0x222>
 <3><215>: Abbrev Number: 7 (DW_TAG_member)

so it appears that the tools agree about the binary .. 

=====
>From gcc-bugs-return-488591-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jun 10 11:04:32 2015
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/61108] [4.8 Regression] gcc 4.8.2 generates incorrect integer arithmetic at O3 (ok at O2)
Date: Wed, 10 Jun 2015 11:04:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ida108

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

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

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Duplicate (I'm currently backporting the fix for the duplicate).

*** This bug has been marked as a duplicate of bug 60656 ***

[Bug bootstrap/66448] [6 Regression] Bootstrap fails on darwin after r224161

[iains at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66448

--- Comment #16 from Iain Sandoe <iains at gcc dot gnu.org> ---
Created attachment 35739
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35739&action=edit
outputs from -save-temps on 20020412-1.c (-O3 -g)

.. of course, we might just have uncovered some latent issue.

[Bug bootstrap/66448] [6 Regression] Bootstrap fails on darwin after r224161

[aldyh at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66448

Aldy Hernandez <aldyh at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #35734|0                           |1
        is obsolete|                            |

--- Comment #17 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
Created attachment 35744
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35744&action=edit
Call check_die on type DIEs and avoid DW_AT_aritificial attribs

On 06/10/2015 04:01 AM, iains at gcc dot gnu.org wrote:>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66448
> 
> --- Comment #15 from Iain Sandoe <iains at gcc dot gnu.org> ---
> (In reply to Aldy Hernandez from comment #14)
>> Created attachment 35734 [details]
>> Patch to ICE on other duplicate DW_AT_ attributes
> 
>> I can't reproduce any of these with a cross compiler.  I'm building a cross
>> with:
>>
>> --enable-languages=c,c++ --disable-bootstrap --disable-multilib
>> --target=i686-darwin
> 
> The triple for the platform I'm testing on is :  x86_64-apple-darwin12

As a side note, if *-apple-darwin{10,12} is the more common variant (as opposed
to *-apple-darwin which uses stabs), may I suggest speaking with the SC to put
a more recent darwin on the secondary platform list instead of
i686-apple-darwin which is stabs (and nobody cares bout stabs ;-)).

>> ...but I still can't get cc1plus to trigger any ICE with the attached patch.
> 
> me neither - nevertheless...

Well, I was testing stabs apparently, but even so, the reason why the ICE did
not trigger was because the duplicate attributes appear on a type DIE, not a
decl DIE.  I was able to reproduce by looking at the assembly.

I added a check for type DIEs and found a slew of problems on Linux as well. 
It seems the Linux linker is far more permissive wrt dwarf.  The attached patch
fixes all the problems you reported that I could reproduce with a cross
compiler for x86_64-apple-darwin10.  It also passes bootstrap and tests on
x86-64 Linux.

Could you test it properly on darwin?

[Bug bootstrap/66448] [6 Regression] Bootstrap fails on darwin after r224161

[iains at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66448

--- Comment #18 from Iain Sandoe <iains at gcc dot gnu.org> ---
(In reply to Aldy Hernandez from comment #17)
> Created attachment 35744 [details]
> Call check_die on type DIEs and avoid DW_AT_aritificial attribs
> 

> >> I can't reproduce any of these with a cross compiler.  I'm building a cross
> >> with:
> >>
> >> --enable-languages=c,c++ --disable-bootstrap --disable-multilib
> >> --target=i686-darwin
> > 
> > The triple for the platform I'm testing on is :  x86_64-apple-darwin12
> 
> As a side note, if *-apple-darwin{10,12} is the more common variant (as
> opposed to *-apple-darwin which uses stabs), may I suggest speaking with the
> SC to put a more recent darwin on the secondary platform list instead of

I must confess, I was under the impression that the p2 was i686-apple-darwin10.
However, that is somewhat out of date (we should prob really default to
x86_64-apple-darwin??)  I think it's prob a good idea for the day-to-day Darwin
folks to discuss with the nominated maintainers and come up with some
recommendation to the SC.

> i686-apple-darwin which is stabs (and nobody cares bout stabs ;-)).
indeed ;-)

> >> ...but I still can't get cc1plus to trigger any ICE with the attached patch.
> > 
> > me neither - nevertheless...
> 
> Well, I was testing stabs apparently, but even so, the reason why the ICE
> did not trigger was because the duplicate attributes appear on a type DIE,
> not a decl DIE.  I was able to reproduce by looking at the assembly.
> 
> I added a check for type DIEs and found a slew of problems on Linux as well.
> It seems the Linux linker is far more permissive wrt dwarf.

Heh.. the "canaries" have their uses… FWIW, ld64 and the other Darwin tools
used to be more forgiving too - they are gradually checking more and more and
being picky about atuff.

>  The attached
> patch fixes all the problems you reported that I could reproduce with a
> cross compiler for x86_64-apple-darwin10.  It also passes bootstrap and
> tests on x86-64 Linux.
> 
> Could you test it properly on darwin?

$ grep -rH "invalid DW" gcc/testsuite |wc -l
       0
thanks!

==== opinion needed:

OK - so now I have one remaining problem.  The change in my intial patch to
make the creation of the "extern int __CFConstantStringClassReference" lazily,
regresses obj-c++ (and, yes, I do care - it's needed to build some interesting
projects).

The reason is that the (lazy) creation will occur in some arbitrary scope - but
the decl really needs to be "pushdecl_top_level".  Unfortunatley, there's no
langhook for that (and Ada doesn't actually provide such a thing, AFAICT).

So … maybe I can find some (probably icky) way around this for Obj-C++ .. or
perhaps recommend a langhook for pushdecl_top_level().

An alternative is to say that var decls created at built-ins init time do not
need  debug?  If you were agreeable with this then a patch like 

 && DECL_SOURCE_LOCATION (decl) != BUILTINS_LOCATION

 as an additional test at passes.c:338, might be worth evaluating?

… or maybe it's practical to init debug before the inits?

WDYT?

(we need to move forward to unbreak Darwin bootstrap, so that we don't get
behind on catching other things - so I'd be inclined to the original patch as
band-aid, in the interim, if all elase fails)
>From gcc-bugs-return-488701-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jun 11 07:57:09 2015
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Subject: [Bug ada/66205] gnatbind generates invalid code when finalization is enabled in restricted runtime
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66205

--- Comment #2 from simon at pushface dot org ---
As a side note, AdaCore’s document on “The GNAT Configurable Run Time
Facility”, section 5.5.2[1], says about Suppress_Standard_Library "All
finalization and initialization (controlled types) is omitted”. I don’t think
this is right; the only part of the standard s-stalib related to finalization
is the procedure Adafinal, which is I think irrelevant to a runtime that
doesn’t support program termination.

[1]
http://docs.adacore.com/gnathie_ug-docs/html/gnathie_ug/gnathie_ug/the_gnat_configurable_run_time_facility.html#specification-of-configuration-parameters
>From gcc-bugs-return-488702-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jun 11 08:03:13 2015
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Subject: [Bug target/65697] __atomic memory barriers not strong enough for __sync builtins
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ide697

--- Comment #62 from mwahab at gcc dot gnu.org ---
(In reply to Ramana Radhakrishnan from comment #61)
> Well, confirmed at least. And at the minute fixed on trunk - not sure if we
> are asking for backports for this ?

Marcus has asked for this to be backported to 5.1 and maybe 4.9. I'm looking at
it.

[Bug bootstrap/66448] [6 Regression] Bootstrap fails on darwin after r224161

[iains at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66448

--- Comment #20 from Iain Sandoe <iains at gcc dot gnu.org> ---
FWIW,
I boostrapped r224366 with the dwarf2out.c changes + this:

diff --git a/gcc/passes.c b/gcc/passes.c
index d3ffe33..1bc8a36 100644
--- a/gcc/passes.c
+++ b/gcc/passes.c
@@ -332,7 +332,7 @@ rest_of_decl_compilation (tree decl,
       */
       && !decl_function_context (decl)
       && !current_function_decl
-
+      && DECL_SOURCE_LOCATION (decl) != BUILTINS_LOCATION
       && !decl_type_context (decl))
     (*debug_hooks->early_global_decl) (decl);
 }

the bootstrap succeeds and the obj-c++ testsuite is not regressed; doing the
rest now.  If there's no objection to this approach (which seems to be just
preserving the status quo) then I'd prefer it.

[Bug bootstrap/66448] [6 Regression] Bootstrap fails on darwin after r224161

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66448

--- Comment #21 from Jason Merrill <jason at gcc dot gnu.org> ---
(In reply to Iain Sandoe from comment #20)
> +      && DECL_SOURCE_LOCATION (decl) != BUILTINS_LOCATION

This seems reasonable.

[Bug bootstrap/66448] [6 Regression] Bootstrap fails on darwin after r224161

[iains at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66448

--- Comment #22 from Iain Sandoe <iains at gcc dot gnu.org> ---
(In reply to Jason Merrill from comment #21)
> (In reply to Iain Sandoe from comment #20)
> > +      && DECL_SOURCE_LOCATION (decl) != BUILTINS_LOCATION
> 
> This seems reasonable.

My testing completed successfully; with Aldy's changes to dwarf2out.c and the
patch mentioned above.  Obv. not my call, but LGTM as a solution.

[Bug bootstrap/66448] [6 Regression] Bootstrap fails on darwin after r224161

[aldyh at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66448

--- Comment #23 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
Author: aldyh
Date: Thu Jun 11 20:46:46 2015
New Revision: 224393

URL: https://gcc.gnu.org/viewcvs?rev=224393&root=gcc&view=rev
Log:
        PR bootstrap/66448
        * dwarf2out.c (check_die): Check for common duplicate attributes.
        (add_location_or_const_value_attribute): Do not add duplicate
        attributes.
        (gen_formal_parameter_die): Do not add DW_AT_artificial the second
        time around.
        (gen_struct_or_union_type_die): Bail early if TREE_ASM_WRITTEN.
        (gen_type_die_with_usage): Call check_die.
        (dwarf2out_decl): Only call check_die() when ENABLE_CHECKING.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/dwarf2out.c

[Bug bootstrap/66448] [6 Regression] Bootstrap fails on darwin after r224161

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66448

--- Comment #24 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
I still see

FAIL: obj-c++.dg/torture/strings/const-cfstring-1.mm   -O0  -fnext-runtime
(test for excess errors)
UNRESOLVED: obj-c++.dg/torture/strings/const-cfstring-1.mm   -O0 
-fnext-runtime compilation failed to produce executable
FAIL: obj-c++.dg/torture/strings/const-cfstring-1.mm   -O1  -fnext-runtime
(test for excess errors)
UNRESOLVED: obj-c++.dg/torture/strings/const-cfstring-1.mm   -O1 
-fnext-runtime compilation failed to produce executable
FAIL: obj-c++.dg/torture/strings/const-cfstring-1.mm   -O2  -fnext-runtime
(test for excess errors)
UNRESOLVED: obj-c++.dg/torture/strings/const-cfstring-1.mm   -O2 
-fnext-runtime compilation failed to produce executable
FAIL: obj-c++.dg/torture/strings/const-cfstring-1.mm   -O3 -fomit-frame-pointer
 -fnext-runtime (test for excess errors)
UNRESOLVED: obj-c++.dg/torture/strings/const-cfstring-1.mm   -O3
-fomit-frame-pointer  -fnext-runtime compilation failed to produce executable
FAIL: obj-c++.dg/torture/strings/const-cfstring-1.mm   -O3 -g  -fnext-runtime
(test for excess errors)
UNRESOLVED: obj-c++.dg/torture/strings/const-cfstring-1.mm   -O3 -g 
-fnext-runtime compilation failed to produce executable
FAIL: obj-c++.dg/torture/strings/const-cfstring-1.mm   -Os  -fnext-runtime
(test for excess errors)
UNRESOLVED: obj-c++.dg/torture/strings/const-cfstring-1.mm   -Os 
-fnext-runtime compilation failed to produce executable
FAIL: obj-c++.dg/torture/strings/const-cfstring-1.mm   -O2 -flto
-flto-partition=none  -fnext-runtime (test for excess errors)
UNRESOLVED: obj-c++.dg/torture/strings/const-cfstring-1.mm   -O2 -flto
-flto-partition=none  -fnext-runtime compilation failed to produce executable
FAIL: obj-c++.dg/torture/strings/const-cfstring-1.mm   -O2 -flto 
-fnext-runtime (test for excess errors)
UNRESOLVED: obj-c++.dg/torture/strings/const-cfstring-1.mm   -O2 -flto 
-fnext-runtime compilation failed to produce executable

with the patches in comments 17 and 20. What am I missing?

[Bug bootstrap/66448] [6 Regression] Bootstrap fails on darwin after r224161

[iains at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66448

--- Comment #26 from Iain Sandoe <iains at gcc dot gnu.org> ---
Author: iains
Date: Sat Jun 13 07:55:05 2015
New Revision: 224451

URL: https://gcc.gnu.org/viewcvs?rev=224451&root=gcc&view=rev
Log:

gcc:
        PR bootstrap/66448
        * passes.c (rest_of_decl_compilation): Do not register globals for
        early debug if they are declared in built-ins.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/passes.c

[Bug bootstrap/66448] [6 Regression] Bootstrap fails on darwin after r224161

[iains at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66448

Iain Sandoe <iains at gcc dot gnu.org> changed:

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

--- Comment #27 from Iain Sandoe <iains at gcc dot gnu.org> ---
fixed