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This makes our std::from_chars implementation use fast_float for decimal parsing of binary32/64 numbers. For other floating-point formats we still use the fallback implementation that goes through the strtod family of functions. libstdc++-v3/ChangeLog: * src/c++17/floating_from_chars.cc: (USE_LIB_FAST_FLOAT): Conditionally define, and use it to conditionally include fast_float. (from_chars): Use fast_float for float and double when USE_LIB_FAST_FLOAT.
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