[Bug tree-optimization/106409] GCC with LTO: -Walloc-size-larger-than warning (argument 1 value ‘18...615’ (SIZE_MAX) exceeds maximum object size with new)

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106409

--- Comment #12 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Lewis Hyatt <lhyatt@gcc.gnu.org>:

https://gcc.gnu.org/g:8e23a9982fa4b885a27608825cbe326d61f20498

commit r16-6110-g8e23a9982fa4b885a27608825cbe326d61f20498
Author: Lewis Hyatt <lhyatt@gmail.com>
Date:   Sun Dec 14 09:51:12 2025 -0500

    middle-end: Fix spurious -Walloc-size-larger-than warning during LTO
[PR106409]

    The implementation of -Walloc-size-larger-than has logic to avoid issuing
    the warning for ::operator new[] calls emitted by the C++ front end, which
    otherwise produce known false positives.  The logic for suppressing the
    warning only activates in the C++ front end, and so it does not prevent the
    LTO front end from issuing the warning.  Fix by applying the logic in all
    cases.

    gcc/ChangeLog:

            PR tree-optimization/106409
            * gimple-ssa-warn-access.cc (maybe_warn_alloc_args_overflow):
Adjust
            comment for clarity, and augment check to work in LTO as well.

    gcc/testsuite/ChangeLog:

            PR tree-optimization/106409
            * g++.dg/lto/pr106409_0.C: New test.