[Bug libc/29141] _FORTIFY_SOURCE=3 fail for gcc 12/glibc 2.35

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=29141

--- Comment #10 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The release/2.34/master branch has been updated by Siddhesh Poyarekar
<siddhesh@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=b72bbba23687ed67887d1d18c51cce5cc9c575ca

commit b72bbba23687ed67887d1d18c51cce5cc9c575ca
Author: Siddhesh Poyarekar <siddhesh@sourceware.org>
Date:   Fri May 13 10:01:47 2022 +0530

    fortify: Ensure that __glibc_fortify condition is a constant [BZ #29141]

    The fix c8ee1c85 introduced a -1 check for object size without also
    checking that object size is a constant.  Because of this, the tree
    optimizer passes in gcc fail to fold away one of the branches in
    __glibc_fortify and trips on a spurious Wstringop-overflow.  The warning
    itself is incorrect and the branch does go away eventually in DCE in the
    rtl passes in gcc, but the constant check is a helpful hint to simplify
    code early, so add it in.

    Resolves: BZ #29141
    Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
    (cherry picked from commit 61a87530108ec9181e1b18a9b727ec3cc3ba7532)

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