include(CheckCXXCompilerFlag) ################################################### # Activate C++14 # # Uses: target_activate_cpp14(buildtarget) ################################################### function(target_activate_cpp14 TARGET) if("${CMAKE_VERSION}" VERSION_GREATER "3.1") set_property(TARGET ${TARGET} PROPERTY CXX_STANDARD 14) set_property(TARGET ${TARGET} PROPERTY CXX_STANDARD_REQUIRED ON) else("${CMAKE_VERSION}" VERSION_GREATER "3.1") check_cxx_compiler_flag("-std=c++14" COMPILER_HAS_CPP14_SUPPORT) if (COMPILER_HAS_CPP14_SUPPORT) target_compile_options(${TARGET} PUBLIC -std=c++14) else(COMPILER_HAS_CPP14_SUPPORT) check_cxx_compiler_flag("-std=c++1y" COMPILER_HAS_CPP14_PARTIAL_SUPPORT) if (COMPILER_HAS_CPP14_PARTIAL_SUPPORT) target_compile_options(${TARGET} PUBLIC -std=c++1y) else() message(FATAL_ERROR "Compiler doesn't support C++14") endif() endif(COMPILER_HAS_CPP14_SUPPORT) endif("${CMAKE_VERSION}" VERSION_GREATER "3.1") # Ideally, we'd like to use libc++ on linux as well, but: # - http://stackoverflow.com/questions/37096062/get-a-basic-c-program-to-compile-using-clang-on-ubuntu-16 # - https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=808086 # so only use it on Apple systems... if(CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND APPLE) target_compile_options(${TARGET} PUBLIC -stdlib=libc++) endif(CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND APPLE) endfunction(target_activate_cpp14) ################################################# # Enable style compiler warnings # # Uses: target_enable_style_warnings(buildtarget) ################################################# function(target_enable_style_warnings TARGET) target_compile_options(${TARGET} PRIVATE -Wall -Wextra) endfunction(target_enable_style_warnings) ################################################## # Add boost to the project # # Uses: # target_add_boost(buildtarget) # if you're only using header-only boost libs # target_add_boost(buildtarget system filesystem) # list all libraries to link against in the dependencies ################################################## function(target_add_boost TARGET) # Load boost libraries if(NOT DEFINED Boost_USE_STATIC_LIBS OR Boost_USE_STATIC_LIBS) # Many supported systems don't have boost >= 1.56. Better link it statically. message(STATUS "Boost will be statically linked") set(Boost_USE_STATIC_LIBS ON) else(NOT DEFINED Boost_USE_STATIC_LIBS OR Boost_USE_STATIC_LIBS) message(STATUS "Boost will be dynamically linked") set(Boost_USE_STATIC_LIBS OFF) endif(NOT DEFINED Boost_USE_STATIC_LIBS OR Boost_USE_STATIC_LIBS) set(BOOST_THREAD_VERSION 4) find_package(Boost 1.58.0 REQUIRED COMPONENTS ${ARGN}) target_include_directories(${TARGET} SYSTEM PUBLIC ${Boost_INCLUDE_DIRS}) target_link_libraries(${TARGET} PUBLIC ${Boost_LIBRARIES}) target_compile_definitions(${TARGET} PUBLIC BOOST_THREAD_VERSION=4) if(${CMAKE_SYSTEM_NAME} MATCHES "Linux") # Also link to rt, because boost thread needs that. target_link_libraries(${TARGET} PUBLIC rt) endif(${CMAKE_SYSTEM_NAME} MATCHES "Linux") endfunction(target_add_boost) ################################################## # Specify that a specific minimal version of gcc is required # # Uses: # require_gcc_version(4.9) ################################################## function(require_gcc_version VERSION) if (CMAKE_COMPILER_IS_GNUCXX) execute_process(COMMAND ${CMAKE_CXX_COMPILER} -dumpversion OUTPUT_VARIABLE GCC_VERSION) if (GCC_VERSION VERSION_LESS ${VERSION}) message(FATAL_ERROR "Needs at least gcc version ${VERSION}, found gcc ${GCC_VERSION}") endif (GCC_VERSION VERSION_LESS ${VERSION}) endif (CMAKE_COMPILER_IS_GNUCXX) endfunction(require_gcc_version) ################################################## # Specify that a specific minimal version of clang is required # # Uses: # require_clang_version(3.5) ################################################## function(require_clang_version VERSION) if (CMAKE_CXX_COMPILER_ID MATCHES "Clang") if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS ${VERSION}) message(FATAL_ERROR "Needs at least clang version ${VERSION}, found clang ${CMAKE_CXX_COMPILER_VERSION}") endif (CMAKE_CXX_COMPILER_VERSION VERSION_LESS ${VERSION}) endif(CMAKE_CXX_COMPILER_ID MATCHES "Clang") endfunction(require_clang_version) ################################################## # Find the location of a library and return its full path in OUTPUT_VARIABLE. # If PATH_VARIABLE points to a defined variable, then the library will only be searched in this path. # If PATH_VARIABLE points to a undefined variable, default system locations will be searched. # # Uses (the following will search for fuse in system locations by default, and if the user passes -DFUSE_LIB_PATH to cmake, it will only search in this path. # find_library_with_path(MYLIBRARY fuse FUSE_LIB_PATH) # target_link_library(target ${MYLIBRARY}) ################################################## function(find_library_with_path OUTPUT_VARIABLE LIBRARY_NAME PATH_VARIABLE) if(${PATH_VARIABLE}) find_library(${OUTPUT_VARIABLE} ${LIBRARY_NAME} PATHS ${${PATH_VARIABLE}} NO_DEFAULT_PATH) if (${OUTPUT_VARIABLE} MATCHES NOTFOUND) message(FATAL_ERROR "Didn't find ${LIBRARY_NAME} in path specified by the ${PATH_VARIABLE} parameter (${${PATH_VARIABLE}}). Pass in the correct path or remove the parameter to try common system locations.") else(${OUTPUT_VARIABLE} MATCHES NOTFOUND) message(STATUS "Found ${LIBRARY_NAME} in user-defined path ${${PATH_VARIABLE}}") endif(${OUTPUT_VARIABLE} MATCHES NOTFOUND) else(${PATH_VARIABLE}) find_library(${OUTPUT_VARIABLE} ${LIBRARY_NAME}) if (${OUTPUT_VARIABLE} MATCHES NOTFOUND) message(FATAL_ERROR "Didn't find ${LIBRARY_NAME} library. If ${LIBRARY_NAME} is installed, try passing in the library location with -D${PATH_VARIABLE}=/path/to/${LIBRARY_NAME}/lib.") else(${OUTPUT_VARIABLE} MATCHES NOTFOUND) message(STATUS "Found ${LIBRARY_NAME} in system location") endif(${OUTPUT_VARIABLE} MATCHES NOTFOUND) endif(${PATH_VARIABLE}) endfunction(find_library_with_path)