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refactor: use attribute to remove -Wunused-function warnings instead of dummy function call

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yumetodo 2017-10-15 13:07:46 +09:00
parent 05272b8e8e
commit d2ba4208be
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GPG Key ID: 894C4304830A7319
2 changed files with 19 additions and 5 deletions
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7
fmt/format.cc
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@ -72,10 +72,10 @@
// Dummy implementations of strerror_r and strerror_s called if corresponding
// system functions are not available.
static inline fmt::internal::Null<> strerror_r(int, char *, ...) {
FMT_MAYBE_UNUSED static inline fmt::internal::Null<> strerror_r(int, char *, ...) {
return fmt::internal::Null<>();
}
static inline fmt::internal::Null<> strerror_s(char *, std::size_t, ...) {
FMT_MAYBE_UNUSED static inline fmt::internal::Null<> strerror_s(char *, std::size_t, ...) {
return fmt::internal::Null<>();
}
@ -180,9 +180,6 @@ int safe_strerror(
: error_code_(err_code), buffer_(buf), buffer_size_(buf_size) {}
int run() {
// Suppress a warning about unused strerror_r and strerror_s.
strerror_r(0, FMT_NULL, "");
strerror_s(FMT_NULL, 0, "");
return handle(strerror_r(error_code_, buffer_, buffer_size_));
}
};

17
fmt/format.h
View File

@ -153,6 +153,23 @@ typedef __int64 intmax_t;
# define FMT_HAS_CPP_ATTRIBUTE(x) 0
#endif
#if FMT_HAS_CPP_ATTRIBUTE(maybe_unused)
# define FMT_HAS_CXX17_ATTRIBUTE_MAYBE_UNUSED
// VC++ 1910 support /std: option and that will set _MSVC_LANG macro
// Clang with Microsoft CodeGen doesn't define _MSVC_LANG macro
#elif defined(_MSVC_LANG) && _MSVC_LANG > 201402
# define FMT_HAS_CXX17_ATTRIBUTE_MAYBE_UNUSED
#endif
#ifdef FMT_HAS_CXX17_ATTRIBUTE_MAYBE_UNUSED
# define FMT_MAYBE_UNUSED [[maybe_unused]]
// g++/clang++ also support [[gnu::unused]]. However, we don't use it.
#elif defined(__GNUC__)
# define FMT_MAYBE_UNUSED __attribute__((unused))
#else
#define FMT_MAYBE_UNUSED
#endif
// Use the compiler's attribute noreturn
#if defined(__MINGW32__) || defined(__MINGW64__)
# define FMT_NORETURN __attribute__((noreturn))