[committed] libstdc++: Ensure std::to_chars overloads all declared in <format> [PR107720]
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Commit Message
Tested powerpc64le-linux. Pushed to trunk.
-- >8 --
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.
---
libstdc++-v3/include/std/format | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
@@ -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.