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Utilize CMake's language standards abstraction when possible
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@ -18,24 +18,40 @@ find_package(PythonLibsNew ${PYBIND11_PYTHON_VERSION} REQUIRED)
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include(CheckCXXCompilerFlag)
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include(CMakeParseArguments)
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if(NOT PYBIND11_CPP_STANDARD AND NOT CMAKE_CXX_STANDARD)
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if(NOT MSVC)
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check_cxx_compiler_flag("-std=c++14" HAS_CPP14_FLAG)
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# Use the language standards abstraction if CMake supports it with the current compiler
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if(NOT CMAKE_VERSION VERSION_LESS 3.1)
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if(NOT CMAKE_CXX_STANDARD)
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if(CMAKE_CXX14_STANDARD_COMPILE_OPTION)
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set(CMAKE_CXX_STANDARD 14)
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elseif(CMAKE_CXX11_STANDARD_COMPILE_OPTION)
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set(CMAKE_CXX_STANDARD 11)
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endif()
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endif()
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if(CMAKE_CXX_STANDARD)
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set(CMAKE_CXX_EXTENSIONS OFF)
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set(CMAKE_CXX_STANDARD_REQUIRED ON)
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endif()
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endif()
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if (HAS_CPP14_FLAG)
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# Fall back to heuristics
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if(NOT PYBIND11_CPP_STANDARD AND NOT CMAKE_CXX_STANDARD)
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if(MSVC)
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set(PYBIND11_CPP_STANDARD /std:c++14)
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else()
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check_cxx_compiler_flag("-std=c++14" HAS_CPP14_FLAG)
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if(HAS_CPP14_FLAG)
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set(PYBIND11_CPP_STANDARD -std=c++14)
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else()
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check_cxx_compiler_flag("-std=c++11" HAS_CPP11_FLAG)
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if (HAS_CPP11_FLAG)
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if(HAS_CPP11_FLAG)
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set(PYBIND11_CPP_STANDARD -std=c++11)
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else()
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message(FATAL_ERROR "Unsupported compiler -- pybind11 requires C++11 support!")
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endif()
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endif()
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elseif(MSVC)
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set(PYBIND11_CPP_STANDARD /std:c++14)
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endif()
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if(NOT PYBIND11_CPP_STANDARD)
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message(FATAL_ERROR "Unsupported compiler -- pybind11 requires C++11 support!")
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endif()
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set(PYBIND11_CPP_STANDARD ${PYBIND11_CPP_STANDARD} CACHE STRING
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"C++ standard flag, e.g. -std=c++11, -std=c++14, /std:c++14. Defaults to C++14 mode." FORCE)
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endif()
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