https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114118
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |jakub at gcc dot gnu.org
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The reason was mainly that without -std=c++23, most of the library support just
isn't there. The f16/f32/f64/f128 etc. literal suffixes will result in
pedwarns,
__STDCPP_FLOAT*_T__ isn't defined, <stdfloat> is a C++23 header, etc.
Most of the library changes were guarded with __STDCPP_FLOAT*_T__ macros.
If you think it is worth it enabling it for C++20 or older as well and such
changes
wouldn't cause problems for valid C++20 or 17 etc. code not using the types,
then
all that (perhaps except for bfloat16_t stuff?) would need to start using
__FLT*_MANT_DIG__ and similar macros instead. But then we also run into a
problem that I think clang++ predefines those even when it doesn't implement
the C++23 paper.
