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From: "nikolasklauser at berlin dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/106759] New: __has_builtin doesn't report
 __is_nothrow_constructible as supported
Date: Fri, 26 Aug 2022 20:38:11 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 12.2.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106759

            Bug ID: 106759
           Summary: __has_builtin doesn't report
                    __is_nothrow_constructible as supported
           Product: gcc
           Version: 12.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: nikolasklauser at berlin dot de
  Target Milestone: ---

__has_builtin normally reports if builtin type traits are supported, but
__has_builtin(__is_nothrow_constructible) is false.

Reproducer: (Godbolt: https://godbolt.org/z/T6d7M6jx7)

#if __has_builtin(__is_nothrow_constructible)
#  error "has builtin" // should error here, but doesn't
#endif

int main() { return __is_nothrow_constructible(int); }=