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libstdc++: Disable std::format of _Float128 if std::to_chars is innaccurate

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This restricts std::format support for _Float128 (and __float128) to
targets where glibc provides __strfromf128 and so can give correct
output.

libstdc++-v3/ChangeLog:

	* include/std/format [__FLT128_DIG__] (_GLIBCXX_FORMAT_F128):
	Only support formatting _Float128 when glibc provides the
	functionality needed for accurate std::to_chars.
This commit is contained in:
Jonathan Wakely 2022-11-15 15:31:17 +00:00
parent 96e4244ef3
commit 22cb0fea71
1 changed files with 2 additions and 2 deletions
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libstdc++-v3/include/std/format
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@ -1235,13 +1235,13 @@ namespace __format
using __float128_t = long double;
# define _GLIBCXX_FORMAT_F128 1
#elif __FLT128_DIG__ && defined(__GLIBC_PREREQ) // see floating_to_chars.cc
#elif __FLT128_DIG__ && defined(_GLIBCXX_HAVE_FLOAT128_MATH)
// Format 128-bit floating-point types using _Float128.
using __float128_t = _Float128;
# define _GLIBCXX_FORMAT_F128 2
# if __cplusplus == 202002L || !defined(_GLIBCXX_HAVE_FLOAT128_MATH)
# if __cplusplus == 202002L
// These overloads exist in the library, but are not declared for C++20.
// Make them available as std::__format::to_chars.
to_chars_result