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Add FMT_USE_FLOCKFILE macro to force has_flockfile trait to false #4666

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Merged
vitaut merged 1 commit into from
Feb 3, 2026
+5 −1
Merged

Add FMT_USE_FLOCKFILE macro to force has_flockfile trait to false #4666

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6 changes: 5 additions & 1 deletion include/fmt/format-inl.h
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Original file line number Diff line number Diff line change
Expand Up @@ -1489,12 +1489,16 @@ template <typename F> auto getc_unlocked(F* f) -> decltype(_fgetc_nolock(f)) {
}
#endif

#ifndef FMT_USE_FLOCKFILE
# define FMT_USE_FLOCKFILE 1
#endif

template <typename F = FILE, typename Enable = void>
struct has_flockfile : std::false_type {};

template <typename F>
struct has_flockfile<F, void_t<decltype(flockfile(&std::declval<F&>()))>>
: std::true_type {};
: bool_constant<FMT_USE_FLOCKFILE != 0> {};

// A FILE wrapper. F is FILE defined as a template parameter to make system API
// detection work.
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