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libstdc++: Ensure std::to_chars overloads all declared in <format> [PR107720]

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For powerpc64le we need to be able to format both of __ieee128 and
__ibm128, so we need the std::to_chars overloads for both types to be
visible at once. The __ieee128 overloads are always visible in C++23
mode, because they're used to implement the _Float128 overloads. The
__ibm128 overloads are only visible when long double is __ibm128.

libstdc++-v3/ChangeLog:

	PR libstdc++/107720
	* include/std/format [_GLIBCXX_LONG_DOUBLE_ALT128_COMPAT]:
	Declare overloads of std::to_chars for the alternative long
	double type.
This commit is contained in:
Jonathan Wakely 2022-11-16 20:47:39 +00:00
parent 80909529c9
commit f69a8299c1
1 changed files with 28 additions and 0 deletions
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28
libstdc++-v3/include/std/format
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@ -1237,6 +1237,34 @@ namespace __format
using __float128_t = __ieee128;
# define _GLIBCXX_FORMAT_F128 1
#ifdef __LONG_DOUBLE_IEEE128__
// These overloads exist in the library, but are not declared.
// Make them available as std::__format::to_chars.
to_chars_result
to_chars(char*, char*, __ibm128) noexcept
__asm("_ZSt8to_charsPcS_e");
to_chars_result
to_chars(char*, char*, __ibm128, chars_format) noexcept
__asm("_ZSt8to_charsPcS_eSt12chars_format");
to_chars_result
to_chars(char*, char*, __ibm128, chars_format, int) noexcept
__asm("_ZSt8to_charsPcS_eSt12chars_formati");
#elif __cplusplus == 202002L
to_chars_result
to_chars(char*, char*, __ieee128) noexcept
__asm("_ZSt8to_charsPcS_u9__ieee128");
to_chars_result
to_chars(char*, char*, __ieee128, chars_format) noexcept
__asm("_ZSt8to_charsPcS_u9__ieee128St12chars_format");
to_chars_result
to_chars(char*, char*, __ieee128, chars_format, int) noexcept
__asm("_ZSt8to_charsPcS_u9__ieee128St12chars_formati");
#endif
#elif defined _GLIBCXX_LDOUBLE_IS_IEEE_BINARY128
// Format 128-bit floating-point types using long double.