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Subject: [Bug c++/114691] [11/12/13 Regression] Bogus ignoring loop
 annotation warning
Date: Sun, 21 Apr 2024 04:09:23 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114691

--- Comment #4 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-13 branch has been updated by Jakub Jelinek
<jakub@gcc.gnu.org>:

https://gcc.gnu.org/g:ed7be7ba6f125cfda7ad07263213cbe02b7e7ced

commit r13-8632-ged7be7ba6f125cfda7ad07263213cbe02b7e7ced
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Fri Apr 12 20:53:10 2024 +0200

    c++: Fix bogus warnings about ignored annotations [PR114691]

    The middle-end warns about the ANNOTATE_EXPR added for while/for loops
    if they declare a var inside of the loop condition.
    This is because the assumption is that ANNOTATE_EXPR argument is used
    immediately in a COND_EXPR (later GIMPLE_COND), but simplify_loop_decl_=
cond
    wraps the ANNOTATE_EXPR inside of a TRUTH_NOT_EXPR, so it no longer
    holds.

    The following patch fixes that by adding the TRUTH_NOT_EXPR inside of t=
he
    ANNOTATE_EXPR argument if any.

    2024-04-12  Jakub Jelinek  <jakub@redhat.com>

            PR c++/114691
            * semantics.cc (simplify_loop_decl_cond): Use cp_build_unary_op
with
            TRUTH_NOT_EXPR on ANNOTATE_EXPR argument (if any) rather than
            ANNOTATE_EXPR itself.

            * g++.dg/ext/pr114691.C: New test.

    (cherry picked from commit 91146346f57cc54dfeb2669347edd0eb3d13af7f)=