[Bug c++/125492] [reflection] Misleading error message when `std::meta::size_of` is applied to a reflected function type

Wed, 17 Jun 2026 08:41:48 -0700 

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125492

--- Comment #1 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Marek Polacek <[email protected]>:

https://gcc.gnu.org/g:8b3e2e68208730dc95a7803a21a545e93c735d5b

commit r17-1627-g8b3e2e68208730dc95a7803a21a545e93c735d5b
Author: Marek Polacek <[email protected]>
Date:   Thu Jun 11 12:18:36 2026 -0400

    c++/reflection: tweak size_of diagnostic [PR125492]

    Here we say "reflection with incomplete type" when size_of
    got a reflection of a function.  Let's clarify that diagnostic.

            PR c++/125492

    gcc/cp/ChangeLog:

            * reflect.cc (eval_size_of): Add a separate throw_exception for
            function types.

    gcc/testsuite/ChangeLog:

            * g++.dg/reflect/size_of2.C: New test.

    Reviewed-by: Patrick Palka <[email protected]>

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