8134156502
The preprocessor check for _GLIBCXX_USE_FLOAT128 is the wrong condition, because when the compiler is built with --with-long-double-format=ieee configure determines that __float128 is the same as long double, and so should not be used. But we do want the std::to_chars overloads for __float128 in that case, because the floating_to_chars.cc file is built with -mabi=ibmlongdouble and so the __float128 overloads are actually the 'long double' ones for -mabi=ieeelongdouble code. This fixes missing definitions of the __float128 overloads of std::to_chars for --with-long-double-format=ieee builds. Without this, there are symbols present in the --with-long-double-abi=ibm build which are missing from the --with-long-double-abi=ieee build. libstdc++-v3/ChangeLog: * src/c++17/floating_to_chars.cc (FLOAT128_TO_CHARS): Depend on LONG_DOUBLE_ALT128_COMPAT instead of USE_FLOAT128. |
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