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Extend FMT_FALLTHROUGH compatibily to gcc and clang pre-C++17

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This commit is contained in:
federico-busato 2019-12-09 17:50:56 +01:00
parent fd52de0c6b
commit e5c8a69863
1 changed files with 11 additions and 3 deletions
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14
include/fmt/format.h
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@ -69,9 +69,17 @@
# define FMT_HAS_BUILTIN(x) 0
#endif
#if FMT_HAS_CPP_ATTRIBUTE(fallthrough) && \
(__cplusplus >= 201703 || FMT_GCC_VERSION != 0)
# define FMT_FALLTHROUGH [[fallthrough]]
#if __cplusplus == 201103L || __cplusplus == 201402L
# if defined(__clang__)
# define FMT_FALLTHROUGH [[clang::fallthrough]];
# elif defined(__GNUC__) && __GNUC__ >= 7
# define FMT_FALLTHROUGH [[gnu::fallthrough]];
# else
# define FMT_FALLTHROUGH
# endif
#elif FMT_HAS_CPP_ATTRIBUTE(fallthrough) && \
((__cplusplus >= 201703) || (defined(_MSVC_LANG) && _MSVC_LANG >= 201703L))
# define FMT_FALLTHROUGH [[fallthrough]];
#else
# define FMT_FALLTHROUGH
#endif