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Subject: [Bug c++/101087] [9/10/11/12 Regression] Unevaluated operand of
 sizeof affects noexcept operator
Date: Thu, 08 Jul 2021 21:39:19 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101087

--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Marek Polacek <mpolacek@gcc.gnu.org>:

https://gcc.gnu.org/g:dee00bf6894be0cabb8f263c993357a6f8444f8b

commit r12-2174-gdee00bf6894be0cabb8f263c993357a6f8444f8b
Author: Marek Polacek <polacek@redhat.com>
Date:   Wed Jul 7 20:02:18 2021 -0400

    c++: Fix noexcept with unevaluated operand [PR101087]

    It sounds plausible that this assert

      int f();
      static_assert(noexcept(sizeof(f())));

    should pass: sizeof produces a std::size_t and its operand is not
    evaluated, so it can't throw.  noexcept should only evaluate to
    false for potentially evaluated operands.  Therefore I think that
    check_noexcept_r shouldn't walk into operands of sizeof/decltype/
    alignof/typeof.

            PR c++/101087

    gcc/cp/ChangeLog:

            * cp-tree.h (unevaluated_p): New.
            * except.c (check_noexcept_r): Use it.  Don't walk into
            unevaluated operands.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp0x/noexcept70.C: New test.=