[Bug compile/29198] New: [Regression] specified bound 4294967295 may exceed maximum object size 2147483647

[Bug compile/29198] New: [Regression] specified bound 4294967295 may exceed maximum object size 2147483647

[danglin at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=29198

            Bug ID: 29198
           Summary: [Regression] specified bound 4294967295 may exceed
                    maximum object size 2147483647
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: compile
          Assignee: unassigned at sourceware dot org
          Reporter: danglin at gcc dot gnu.org
                CC: tromey at sourceware dot org
  Target Milestone: ---
              Host: hppa*-*-linux*
            Target: hppa*-*-linux*
             Build: hppa*-*-linux*

The following compile error was introduced by commit
8839e3f3b0d1af5d93ba1d4f667ce33936bb7db2:

  CXX    debuginfod-support.o
In file included from /usr/include/c++/11/string:40,
                 from ../../src/gdb/../gdbsupport/ptid.h:36,
                 from ../../src/gdb/../gdbsupport/common-defs.h:198,
                 from ../../src/gdb/defs.h:28,
                 from ../../src/gdb/debuginfod-support.c:19:
In static member function 'static constexpr const char_type*
std::char_traits<char>::find(const char_type*, std::size_t, const char_type&)',
    inlined from 'constexpr std::basic_string_view<_CharT, _Traits>::size_type
std::basic_string_view<_CharT, _Traits>::find(_CharT,
std::basic_string_view<_CharT, _Traits>::size_type) const [with _CharT = char;
_Traits = std::char_traits<char>]' at
/usr/include/c++/11/bits/string_view.tcc:87:41,
    inlined from 'constexpr std::basic_string_view<_CharT, _Traits>::size_type
std::basic_string_view<_CharT, _Traits>::find_first_of(_CharT,
std::basic_string_view<_CharT, _Traits>::size_type) const [with _CharT = char;
_Traits = std::char_traits<char>]' at /usr/include/c++/11/string_view:431:26,
    inlined from 'bool debuginfod_is_enabled()' at
../../src/gdb/debuginfod-support.c:193:40:
/usr/include/c++/11/bits/char_traits.h:413:62: error: 'void*
__builtin_memchr(const void*, int, unsigned int)' specified bound 4294967295
may exceed maximum object size 2147483647 [-Werror=stringop-overread]
  413 |         return static_cast<const char_type*>(__builtin_memchr(__s, __a,
__n));
      |                                             
~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~
cc1plus: all warnings being treated as errors
make[2]: *** [Makefile:1659: debuginfod-support.o] Error 1
make[2]: Leaving directory '/home/dave/gnu/binutils/objdir/gdb'

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[Bug compile/29198] [Regression] specified bound 4294967295 may exceed maximum object size 2147483647

[mark at klomp dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=29198

Mark Wielaard <mark at klomp dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mark at klomp dot org

--- Comment #1 from Mark Wielaard <mark at klomp dot org> ---
commit 716e54731f30bc60b2fc52996ebe4fc087420b2e
gdb: Workaround stringop-overread warning in debuginfod-support.c on s390x

commit 73a5cb257a21ad38c85932b7be4a903404d91899
gdb: Workaround stringop-overread warning in debuginfod-support.c on powerpc64

Maybe that fix should not be arch specific?

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[Bug compile/29198] [Regression] specified bound 4294967295 may exceed maximum object size 2147483647

[danglin at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=29198

--- Comment #2 from John David Anglin <danglin at gcc dot gnu.org> ---
Might this be a gcc bug?

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[Bug compile/29198] [Regression] specified bound 4294967295 may exceed maximum object size 2147483647

[mark at klomp dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=29198

Mark Wielaard <mark at klomp dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=97185

--- Comment #3 from Mark Wielaard <mark at klomp dot org> ---
(In reply to John David Anglin from comment #2)
> Might this be a gcc bug?

Yes, I suspect it is https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97185 where
some range information is removed for some, but not all builtins causing the
impossible warning message about the string size.

I proposed the following patch to just always suppress this diagnostic for now
on all arches:
https://sourceware.org/pipermail/gdb-patches/2022-May/189603.html

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[Bug build/29198] [Regression] specified bound 4294967295 may exceed maximum object size 2147483647

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=29198

Tom Tromey <tromey at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|compile                     |build

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[Bug build/29198] [Regression] specified bound 4294967295 may exceed maximum object size 2147483647

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=29198

--- Comment #4 from Tom Tromey <tromey at sourceware dot org> ---
Is this fixed now?

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[Bug build/29198] [Regression] specified bound 4294967295 may exceed maximum object size 2147483647

[dave.anglin at bell dot net]

https://sourceware.org/bugzilla/show_bug.cgi?id=29198

--- Comment #5 from dave.anglin at bell dot net ---
On 2022-12-23 3:04 p.m., tromey at sourceware dot org wrote:
> https://sourceware.org/bugzilla/show_bug.cgi?id=29198
>
> --- Comment #4 from Tom Tromey <tromey at sourceware dot org> ---
> Is this fixed now?
The error no longer occurs but I'm not sure the underlying cause was fixed.

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[Bug build/29198] [Regression] specified bound 4294967295 may exceed maximum object size 2147483647

[mark at klomp dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=29198

--- Comment #6 from Mark Wielaard <mark at klomp dot org> ---
The patch to suppress this warning was pushed:

commit dac0515d825e788dec188fff4d5b9d4ac7383f33
Author: Mark Wielaard <mark@klomp.org>
Date:   Tue May 31 11:00:06 2022 +0200

    gdb: Always suppress stringop-overread warning in debuginfod-support.c

    Just like on s390x with g++ 11.2.1 and ppc64le with g++ 11.3.1 g++ 11
    on hppa produces a spurious warning for stringop-overread in
    debuginfod_is_enabled for url_view. Just always suppress it on all
    arches.

    https://sourceware.org/bugzilla/show_bug.cgi?id=29198

    gdb/ChangeLog:

            * debuginfod-support.c (debuginfod_is_enabled): Always use
            DIAGNOSTIC_IGNORE_STRINGOP_OVERREAD.

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[Bug build/29198] [Regression] specified bound 4294967295 may exceed maximum object size 2147483647

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=29198

Tom Tromey <tromey at sourceware dot org> changed:

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

--- Comment #7 from Tom Tromey <tromey at sourceware dot org> ---
Ok, thanks.  I'm going to close this.

> The error no longer occurs but I'm not sure the underlying cause was fixed.

IIUC the underlying cause is a compiler bug, so I suppose
there ought to be an entry in the GCC bugzilla.

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[Bug build/29198] [Regression] specified bound 4294967295 may exceed maximum object size 2147483647

[mark at klomp dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=29198

--- Comment #8 from Mark Wielaard <mark at klomp dot org> ---
(In reply to Tom Tromey from comment #7)
> IIUC the underlying cause is a compiler bug, so I suppose
> there ought to be an entry in the GCC bugzilla.

That would be https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97185

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