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Improve BENCHMARK_UNUSED definition (#1111) 

Take advantage of C++17's `[[maybe_unused]]` if it's available. Also clang supports `__attribute__((unused))` so add that too.
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Dominic Hamon 2021-04-12 12:46:05 +01:00 committed by GitHub
parent 07578d82e0
commit 39b5a298a7
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1 changed files with 14 additions and 3 deletions
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17
include/benchmark/benchmark.h
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@ -167,6 +167,12 @@ BENCHMARK(BM_test)->Unit(benchmark::kMillisecond);
#define BENCHMARK_HAS_CXX11
#endif
// This _MSC_VER check should detect VS 2017 v15.3 and newer.
#if __cplusplus >= 201703L || \
(defined(_MSC_VER) && _MSC_VER >= 1911 && _MSVC_LANG >= 201703L)
#define BENCHMARK_HAS_CXX17
#endif
#include <stdint.h>
#include <algorithm>
@ -199,13 +205,19 @@ BENCHMARK(BM_test)->Unit(benchmark::kMillisecond);
TypeName& operator=(const TypeName&) = delete
#endif
#if defined(__GNUC__)
#ifdef BENCHMARK_HAS_CXX17
#define BENCHMARK_UNUSED [[maybe_unused]]
#elif defined(__GNUC__) || defined(__clang__)
#define BENCHMARK_UNUSED __attribute__((unused))
#else
#define BENCHMARK_UNUSED
#endif
#if defined(__GNUC__) || defined(__clang__)
#define BENCHMARK_ALWAYS_INLINE __attribute__((always_inline))
#define BENCHMARK_NOEXCEPT noexcept
#define BENCHMARK_NOEXCEPT_OP(x) noexcept(x)
#elif defined(_MSC_VER) && !defined(__clang__)
#define BENCHMARK_UNUSED
#define BENCHMARK_ALWAYS_INLINE __forceinline
#if _MSC_VER >= 1900
#define BENCHMARK_NOEXCEPT noexcept
@ -216,7 +228,6 @@ BENCHMARK(BM_test)->Unit(benchmark::kMillisecond);
#endif
#define __func__ __FUNCTION__
#else
#define BENCHMARK_UNUSED
#define BENCHMARK_ALWAYS_INLINE
#define BENCHMARK_NOEXCEPT
#define BENCHMARK_NOEXCEPT_OP(x)