https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94753
--- Comment #3 from r_new at rambler dot ru ---
Don't know gcc code, but
/* For C++11+ __cpp_constexpr and __cpp_static_assert should be defined. */
#if __cplusplus >= 201103L
is not true.
All standard predefined macros listed in chapt
: preprocessor
Assignee: unassigned at gcc dot gnu.org
Reporter: r_new at rambler dot ru
Target Milestone: ---
In c++20 feature-test macros (__cpp_attributes, __cpp_constexpr, ...) are
standard predefined macros, must be predefined even with -undef.
g++ -undef -std=c++2a -E -dM -x c
