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Add FMT_HAS_CPP14_ATTRIBUTE / FMT_HAS_CPP17_ATTRIBUTE to test for language-specific attributes.

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FMT_DEPRECATED is now defined as FMT_HAS_CPP14_ATTRIBUTE(deprecated), as this attribute was introduced in C++14.

FMT_FALLTHROUGH is now defined as FMT_HAS_CPP17_ATTRIBUTE(fallthrough), as this attribute was introduced in C++17.

FMT_MAYBE_UNUSED is defined as FMT_HAS_CPP17_ATTRIBUTE(maybe_unused), as this attribute was introduced in C++17.

FMT_MAYBE_UNUSED has been applied to fix a couple of -Wunused-member-function warnings from clang.
This commit is contained in:
Dair Grant
2020-03-02 14:51:51 +00:00
committed by Victor Zverovich
parent 3c24052cf1
commit 02bfd8a9a5
3 changed files with 20 additions and 4 deletions
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17
include/fmt/core.h
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@@ -36,6 +36,12 @@
# define FMT_HAS_CPP_ATTRIBUTE(x) 0
#endif
#define FMT_HAS_CPP14_ATTRIBUTE(attribute) \
(__cplusplus >= 201402L && FMT_HAS_CPP_ATTRIBUTE(attribute))
#define FMT_HAS_CPP17_ATTRIBUTE(attribute) \
(__cplusplus >= 201703L && FMT_HAS_CPP_ATTRIBUTE(attribute))
#ifdef __clang__
# define FMT_CLANG_VERSION (__clang_major__ * 100 + __clang_minor__)
#else
@@ -132,9 +138,16 @@
# define FMT_NORETURN
#endif
#ifndef FMT_MAYBE_UNUSED
# if FMT_HAS_CPP17_ATTRIBUTE(maybe_unused)
# define FMT_MAYBE_UNUSED [[maybe_unused]]
# else
# define FMT_MAYBE_UNUSED
# endif
#endif
#ifndef FMT_DEPRECATED
# if (FMT_HAS_CPP_ATTRIBUTE(deprecated) && __cplusplus >= 201402L) || \
FMT_MSC_VER >= 1900
# if FMT_HAS_CPP14_ATTRIBUTE(deprecated) || FMT_MSC_VER >= 1900
# define FMT_DEPRECATED [[deprecated]]
# else
# if defined(__GNUC__) || defined(__clang__)