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Utilize CMake's language standards abstraction when possible

This commit is contained in:
Chuck Atkins 2018-06-12 13:18:48 -04:00 committed by Wenzel Jakob
parent f6e543b15e
commit d730fbc0d5
1 changed files with 25 additions and 9 deletions
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34
tools/pybind11Tools.cmake
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@ -18,24 +18,40 @@ find_package(PythonLibsNew ${PYBIND11_PYTHON_VERSION} REQUIRED)
include(CheckCXXCompilerFlag)
include(CMakeParseArguments)
if(NOT PYBIND11_CPP_STANDARD AND NOT CMAKE_CXX_STANDARD)
if(NOT MSVC)
check_cxx_compiler_flag("-std=c++14" HAS_CPP14_FLAG)
# Use the language standards abstraction if CMake supports it with the current compiler
if(NOT CMAKE_VERSION VERSION_LESS 3.1)
if(NOT CMAKE_CXX_STANDARD)
if(CMAKE_CXX14_STANDARD_COMPILE_OPTION)
set(CMAKE_CXX_STANDARD 14)
elseif(CMAKE_CXX11_STANDARD_COMPILE_OPTION)
set(CMAKE_CXX_STANDARD 11)
endif()
endif()
if(CMAKE_CXX_STANDARD)
set(CMAKE_CXX_EXTENSIONS OFF)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
endif()
endif()
if (HAS_CPP14_FLAG)
# Fall back to heuristics
if(NOT PYBIND11_CPP_STANDARD AND NOT CMAKE_CXX_STANDARD)
if(MSVC)
set(PYBIND11_CPP_STANDARD /std:c++14)
else()
check_cxx_compiler_flag("-std=c++14" HAS_CPP14_FLAG)
if(HAS_CPP14_FLAG)
set(PYBIND11_CPP_STANDARD -std=c++14)
else()
check_cxx_compiler_flag("-std=c++11" HAS_CPP11_FLAG)
if (HAS_CPP11_FLAG)
if(HAS_CPP11_FLAG)
set(PYBIND11_CPP_STANDARD -std=c++11)
else()
message(FATAL_ERROR "Unsupported compiler -- pybind11 requires C++11 support!")
endif()
endif()
elseif(MSVC)
set(PYBIND11_CPP_STANDARD /std:c++14)
endif()
if(NOT PYBIND11_CPP_STANDARD)
message(FATAL_ERROR "Unsupported compiler -- pybind11 requires C++11 support!")
endif()
set(PYBIND11_CPP_STANDARD ${PYBIND11_CPP_STANDARD} CACHE STRING
"C++ standard flag, e.g. -std=c++11, -std=c++14, /std:c++14. Defaults to C++14 mode." FORCE)
endif()