coco
114 lines
4.5 KiB
CMake
114 lines
4.5 KiB
CMake
# This script creates a function, enable_cpp11_for_target(), which checks if your
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# compiler has C++11 support and enables it if it does.
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cmake_minimum_required(VERSION 2.8.12)
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if (POLICY CMP0054)
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cmake_policy(SET CMP0054 NEW)
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endif()
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set(_where_is_cmake_utils_dir ${CMAKE_CURRENT_LIST_DIR})
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function(enable_cpp11_for_target target_name)
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# Set to false unless we find out otherwise in the code below.
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set(COMPILER_CAN_DO_CPP_11 0)
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macro(test_compiler_for_cpp11)
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message(STATUS "Building a C++11 test project to see if your compiler supports C++11")
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try_compile(test_for_cpp11_worked ${PROJECT_BINARY_DIR}/cpp11_test_build
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${_where_is_cmake_utils_dir}/test_for_cpp11 cpp11_test)
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if (test_for_cpp11_worked)
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message(STATUS "C++11 activated.")
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set(COMPILER_CAN_DO_CPP_11 1)
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else()
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set(COMPILER_CAN_DO_CPP_11 0)
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message(STATUS "********** Your compiler failed to build a C++11 project. C++11 is required to use all parts of dlib! **********")
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endif()
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endmacro()
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# Now turn on the appropriate compiler switch to enable C++11 if you have a
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# C++11 compiler. In CMake 3.1 there is a simple flag you can set, but earlier
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# verions of CMake are not so convenient.
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if (CMAKE_VERSION VERSION_LESS "3.1.2")
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if(CMAKE_COMPILER_IS_GNUCXX)
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execute_process(COMMAND ${CMAKE_CXX_COMPILER} -dumpversion OUTPUT_VARIABLE GCC_VERSION)
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if (GCC_VERSION VERSION_GREATER 4.8 OR GCC_VERSION VERSION_EQUAL 4.8)
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message(STATUS "C++11 activated.")
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target_compile_options(${target_name} PUBLIC "-std=gnu++11")
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set(COMPILER_CAN_DO_CPP_11 1)
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endif()
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elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
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execute_process( COMMAND ${CMAKE_CXX_COMPILER} --version OUTPUT_VARIABLE clang_full_version_string )
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string (REGEX REPLACE ".*clang version ([0-9]+\\.[0-9]+).*" "\\1" CLANG_VERSION ${clang_full_version_string})
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if (CLANG_VERSION VERSION_GREATER 3.3)
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message(STATUS "C++11 activated.")
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target_compile_options(${target_name} PUBLIC "-std=c++11")
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set(COMPILER_CAN_DO_CPP_11 1)
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endif()
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else()
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# Since we don't know what compiler this is just try to build a c++11 project and see if it compiles.
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test_compiler_for_cpp11()
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endif()
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else()
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# Set a flag if the compiler you are using is capable of providing C++11 features.
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get_property(cxx_features GLOBAL PROPERTY CMAKE_CXX_KNOWN_FEATURES)
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if (";${cxx_features};" MATCHES ";cxx_rvalue_references;" AND
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";${cxx_features};" MATCHES ";cxx_variadic_templates;" AND
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";${cxx_features};" MATCHES ";cxx_lambdas;" AND
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";${cxx_features};" MATCHES ";cxx_defaulted_move_initializers;" AND
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";${cxx_features};" MATCHES ";cxx_delegating_constructors;" AND
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";${cxx_features};" MATCHES ";cxx_thread_local;" AND
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";${cxx_features};" MATCHES ";cxx_constexpr;" AND
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";${cxx_features};" MATCHES ";cxx_decltype_incomplete_return_types;" AND
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";${cxx_features};" MATCHES ";cxx_auto_type;")
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set(COMPILER_CAN_DO_CPP_11 1)
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# Tell cmake that we need C++11 for dlib
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target_compile_features(${target_name}
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PUBLIC
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cxx_rvalue_references
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cxx_variadic_templates
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cxx_lambdas
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cxx_defaulted_move_initializers
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cxx_delegating_constructors
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cxx_thread_local
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cxx_constexpr
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# cxx_decltype_incomplete_return_types # purposfully commented out because cmake errors out on this when using visual studio and cmake 3.8.0
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cxx_auto_type
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)
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if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
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# Sometimes clang will lie and report that it supports C++11 when
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# really it doesn't support thread_local. So check for that.
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test_compiler_for_cpp11()
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else()
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message(STATUS "C++11 activated.")
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endif()
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endif()
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endif()
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# Always enable whatever partial C++11 support we have, even if it isn't full
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# support, and just hope for the best.
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if (NOT COMPILER_CAN_DO_CPP_11)
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include(CheckCXXCompilerFlag)
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CHECK_CXX_COMPILER_FLAG("-std=c++11" COMPILER_SUPPORTS_CXX11)
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CHECK_CXX_COMPILER_FLAG("-std=c++0x" COMPILER_SUPPORTS_CXX0X)
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if(COMPILER_SUPPORTS_CXX11)
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message(STATUS "C++11 activated (compiler doesn't have full C++11 support).")
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target_compile_options(${target_name} PUBLIC "-std=c++11")
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elseif(COMPILER_SUPPORTS_CXX0X)
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message(STATUS "C++0x activated (compiler doesn't have full C++11 support).")
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target_compile_options(${target_name} PUBLIC "-std=c++0x")
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endif()
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endif()
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endfunction()
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