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| author | Jonathan Wakely <jwakely@redhat.com> | 2022-11-15 15:31:17 +0000 |
|---|---|---|
| committer | Jonathan Wakely <jwakely@redhat.com> | 2022-11-16 20:52:03 +0000 |
| commit | 22cb0fea718fd4dab8c97c8f03054a2fb7dc3d76 (patch) | |
| tree | 0c616f94853efe0f401de8913535f27b89afd3d4 /libstdc++-v3 | |
| parent | 96e4244ef3ccf4867ca4e37fbc6800e64ef30af6 (diff) | |
| download | gcc-22cb0fea718fd4dab8c97c8f03054a2fb7dc3d76.zip gcc-22cb0fea718fd4dab8c97c8f03054a2fb7dc3d76.tar.gz gcc-22cb0fea718fd4dab8c97c8f03054a2fb7dc3d76.tar.bz2 | |
libstdc++: Disable std::format of _Float128 if std::to_chars is innaccurate
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.
Diffstat (limited to 'libstdc++-v3')
| -rw-r--r-- | libstdc++-v3/include/std/format | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/libstdc++-v3/include/std/format b/libstdc++-v3/include/std/format index 204a171..fb29f7e 100644 --- a/libstdc++-v3/include/std/format +++ b/libstdc++-v3/include/std/format @@ -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 |