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Subject: [Bug middle-end/104550] bogus warning from -Wuninitialized +
 -ftrivial-auto-var-init=pattern
Date: Mon, 28 Feb 2022 15:58:58 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104550

--- Comment #21 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Qing Zhao <qinzhao@gcc.gnu.org>:

https://gcc.gnu.org/g:3f3246eb16f554c70c5ce87ad2c785f83adb4625

commit r12-7411-g3f3246eb16f554c70c5ce87ad2c785f83adb4625
Author: Qing Zhao <qing.zhao@oracle.com>
Date:   Mon Feb 28 15:58:43 2022 +0000

    Suppress uninitialized warnings for new created uses from
__builtin_clear_padding folding [PR104550]

    __builtin_clear_padding(&object) will clear all the padding bits of the
object.
    actually, it doesn't involve any use of an user variable. Therefore, us=
ers
do
    not expect any uninitialized warning from it. It's reasonable to suppre=
ss
    uninitialized warnings for all new created uses from
__builtin_clear_padding
    folding.

            PR middle-end/104550

    gcc/ChangeLog:

            * gimple-fold.cc (clear_padding_flush): Suppress warnings for n=
ew
            created uses.

    gcc/testsuite/ChangeLog:

            * gcc.dg/auto-init-pr104550-1.c: New test.
            * gcc.dg/auto-init-pr104550-2.c: New test.
            * gcc.dg/auto-init-pr104550-3.c: New test.=