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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug other/109293] [12/13 Regression] Missing memmem() prototype in
 fixincludes/fixfixes.c on Windows/MinGW-W64
Date: Tue, 28 Mar 2023 07:26:39 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109293

--- Comment #7 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Xi Ruoyao <xry111@gcc.gnu.org>:

https://gcc.gnu.org/g:21c74b6ea41d21ef96813b34bfa55c51a82d6c99

commit r13-6888-g21c74b6ea41d21ef96813b34bfa55c51a82d6c99
Author: Xi Ruoyao <xry111@xry111.site>
Date:   Tue Mar 28 01:48:02 2023 +0800

    fixincludes: Declare memmem if it's not declared in system headers
[PR109293]

    memmem is not POSIX so the system may lack it.  Then libiberty will
    provide an implementation, but it's a "supplemental function" and not
    declared in libiberty.h.  We need to declare the prototype to use it
    then.

    See libiberty doc at
    https://gcc.gnu.org/onlinedocs/libiberty/Supplemental-Functions.html.

    Tested by bootstrapping GCC in the following container environments on
    x86_64-linux-gnu:

    1. "Vanilla" system with memmem in Glibc.
    2. memmem removed from string.h.
    3. memmem removed from both string.h and libc.so.

    For 3, also verified that memmem from libiberty is linked into fixincl
    executable.

    Ok for trunk?

    fixincludes/ChangeLog:

            PR other/109293
            * configure.ac (AC_CHECK_DECLS): Add memmem.
            * configure: Regenerate.
            * config.h.in: Regenerate.
            * system.h (memmem): Declare if HAVE_DECL_MEMMEM is zero.=