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Fix compile error with gcc 9: use of [[unlikely]] #392

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Merged
lemire merged 1 commit into from
Jun 11, 2026
+5 −1
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Fix compile error with gcc 9: use of [[unlikely]] #392

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6 changes: 5 additions & 1 deletion include/fast_float/float_common.h
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Original file line number Diff line number Diff line change
Expand Up @@ -207,7 +207,11 @@ using parse_options = parse_options_t<char>;
// to a no-op elsewhere (e.g. pre-C++20 MSVC, which has no equivalent hint).
#ifdef __has_cpp_attribute
#if __has_cpp_attribute(unlikely) >= 201803L
#define FASTFLOAT_USE_UNLIKELY_ATTR 1
// g++-9 hits hits this branch, but then fails to compile
// [[unlikely]]. This happens only with g++-9.
#if !defined(__GNUC__) || (__GNUC__ != 9)
#define FASTFLOAT_USE_UNLIKELY_ATTR
#endif
#endif
#endif

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