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Subject: [Bug libc/29141] _FORTIFY_SOURCE=3 fail for gcc 12/glibc 2.35
Date: Mon, 16 May 2022 14:41:20 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29141

--- Comment #7 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gn=
u.org> ---
The master branch has been updated by Siddhesh Poyarekar
<siddhesh@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=3Dglibc.git;h=3D61a87530108ec9181e1=
b18a9b727ec3cc3ba7532

commit 61a87530108ec9181e1b18a9b727ec3cc3ba7532
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>

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