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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 middle-end/112909] [14 Regression] glibc -Wuninitialized build
 failure for i686-gnu
Date: Fri, 08 Dec 2023 10:32:16 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112909

--- Comment #3 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:5e25baa7e577f9b73f746005efb5ccd4e000e51e

commit r14-6319-g5e25baa7e577f9b73f746005efb5ccd4e000e51e
Author: Richard Biener <rguenther@suse.de>
Date:   Fri Dec 8 09:14:43 2023 +0100

    tree-optimization/112909 - uninit diagnostic with abnormal copy

    The following avoids spurious uninit diagnostics for SSA name
    copies which mostly appear when the source is marked as abnormal
    which prevents copy propagation.

    To prevent regressions I remove the bail out for anonymous SSA
    names in the PHI arg place from warn_uninitialized_phi leaving
    that to warn_uninit where I handle SSA copies from a SSA name
    which isn't anonymous.  In theory this might cause more
    valid and false positive diagnostics to pop up.

            PR tree-optimization/112909
            * tree-ssa-uninit.cc (find_uninit_use): Look through a
            single level of SSA name copies with single use.

            * gcc.dg/uninit-pr112909.c: New testcase.=