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Remove C++17 extension warning from clang; #1535

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- Switch off `nodiscard` for clang unless C++17 is detected.
- Detect C++ standard before the switch.
This commit is contained in:
Watal M. Iwasaki 2019-03-28 14:38:58 +09:00
parent d79c16801a
commit 5ccdaf643f
2 changed files with 26 additions and 18 deletions
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22
include/nlohmann/detail/macro_scope.hpp
View File

@ -18,6 +18,14 @@
#endif
#endif
// C++ language standard detection
#if (defined(__cplusplus) && __cplusplus >= 201703L) || (defined(_HAS_CXX17) && _HAS_CXX17 == 1) // fix for issue #464
#define JSON_HAS_CPP_17
#define JSON_HAS_CPP_14
#elif (defined(__cplusplus) && __cplusplus >= 201402L) || (defined(_HAS_CXX14) && _HAS_CXX14 == 1)
#define JSON_HAS_CPP_14
#endif
// disable float-equal warnings on GCC/clang
#if defined(__clang__) || defined(__GNUC__) || defined(__GNUG__)
#pragma GCC diagnostic push
@ -42,7 +50,11 @@
// allow for portable nodiscard warnings
#if defined(__has_cpp_attribute)
#if __has_cpp_attribute(nodiscard)
#define JSON_NODISCARD [[nodiscard]]
#if defined(__clang__) && !defined(JSON_HAS_CPP_17) // issue #1535
#define JSON_NODISCARD
#else
#define JSON_NODISCARD [[nodiscard]]
#endif
#elif __has_cpp_attribute(gnu::warn_unused_result)
#define JSON_NODISCARD [[gnu::warn_unused_result]]
#else
@ -95,14 +107,6 @@
#define JSON_UNLIKELY(x) x
#endif
// C++ language standard detection
#if (defined(__cplusplus) && __cplusplus >= 201703L) || (defined(_HAS_CXX17) && _HAS_CXX17 == 1) // fix for issue #464
#define JSON_HAS_CPP_17
#define JSON_HAS_CPP_14
#elif (defined(__cplusplus) && __cplusplus >= 201402L) || (defined(_HAS_CXX14) && _HAS_CXX14 == 1)
#define JSON_HAS_CPP_14
#endif
/*!
@brief macro to briefly define a mapping between an enum and JSON
@def NLOHMANN_JSON_SERIALIZE_ENUM

22
single_include/nlohmann/json.hpp
View File

@ -469,6 +469,14 @@ class other_error : public exception
#endif
#endif
// C++ language standard detection
#if (defined(__cplusplus) && __cplusplus >= 201703L) || (defined(_HAS_CXX17) && _HAS_CXX17 == 1) // fix for issue #464
#define JSON_HAS_CPP_17
#define JSON_HAS_CPP_14
#elif (defined(__cplusplus) && __cplusplus >= 201402L) || (defined(_HAS_CXX14) && _HAS_CXX14 == 1)
#define JSON_HAS_CPP_14
#endif
// disable float-equal warnings on GCC/clang
#if defined(__clang__) || defined(__GNUC__) || defined(__GNUG__)
#pragma GCC diagnostic push
@ -493,7 +501,11 @@ class other_error : public exception
// allow for portable nodiscard warnings
#if defined(__has_cpp_attribute)
#if __has_cpp_attribute(nodiscard)
#define JSON_NODISCARD [[nodiscard]]
#if defined(__clang__) && !defined(JSON_HAS_CPP_17) // issue #1535
#define JSON_NODISCARD
#else
#define JSON_NODISCARD [[nodiscard]]
#endif
#elif __has_cpp_attribute(gnu::warn_unused_result)
#define JSON_NODISCARD [[gnu::warn_unused_result]]
#else
@ -546,14 +558,6 @@ class other_error : public exception
#define JSON_UNLIKELY(x) x
#endif
// C++ language standard detection
#if (defined(__cplusplus) && __cplusplus >= 201703L) || (defined(_HAS_CXX17) && _HAS_CXX17 == 1) // fix for issue #464
#define JSON_HAS_CPP_17
#define JSON_HAS_CPP_14
#elif (defined(__cplusplus) && __cplusplus >= 201402L) || (defined(_HAS_CXX14) && _HAS_CXX14 == 1)
#define JSON_HAS_CPP_14
#endif
/*!
@brief macro to briefly define a mapping between an enum and JSON
@def NLOHMANN_JSON_SERIALIZE_ENUM