cmlib/CMLibCommonTargetProperties.cmake

set(COMMON_CXX_FEATURES cxx_alias_templates cxx_nullptr cxx_override)

function(common_target_properties Name)
  get_target_property(__type ${Name} TYPE)
  set(__visibility PUBLIC)
  if(__type STREQUAL INTERFACE_LIBRARY)
    set(__interface 1)
    set(__visibility INTERFACE)
  endif()
  target_compile_features(${Name} ${__visibility} ${COMMON_CXX_FEATURES})
  get_target_property(_targetType ${Name} TYPE)
  if(_targetType STREQUAL "EXECUTABLE" AND CMAKE_CXX_COMPILE_OPTIONS_PIE)
    target_compile_options(${Name} PUBLIC "${CMAKE_CXX_COMPILE_OPTIONS_PIE}")
  endif()
  target_include_directories(${Name}
                             PUBLIC $<INSTALL_INTERFACE:include>
                                    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
                                    $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>
                                    $<BUILD_INTERFACE:${CMAKE_BINARY_DIR}/include>)
  if(APPLE)
    target_compile_definitions(${Name} ${__visibility} Darwin)
  endif()
  if(NOT __interface)
    if(TARGET Qt5::Core)
      if(_targetType STREQUAL "EXECUTABLE")
        target_compile_options(${Name} PUBLIC "${Qt5Core_EXECUTABLE_COMPILE_FLAGS}")
      endif()
      set_target_properties(${Name}
                            PROPERTIES AUTOMOC
                                       TRUE
                                       AUTORCC
                                       TRUE)
    endif()
    if(TARGET Qt5::Widgets)
      set_target_properties(${Name} PROPERTIES AUTOUIC TRUE)
      #      if(CMAKE_VERSION VERSION_LESS 3.7.99)
      #        target_include_directories(
      #          ${Name}
      #          PUBLIC
      #          $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/${Name}_autogen/include>
      #          )
      #      endif()
    endif()
    if(CMAKE_CXX_COMPILER_IS_GCC AND NOT APPLE)
      set_target_properties(${Name} PROPERTIES LINK_FLAGS "-Wl,--no-as-needed")
    endif()
  endif()

  # LTO only for executables (not libraries) in Release build type
  get_target_property(target_type ${Name} TYPE)
  if(target_type STREQUAL "EXECUTABLE" AND CMAKE_BUILD_TYPE STREQUAL "Release")
    check_cxx_compiler_flag(-flto CXX_HAS_LTO_FLAG)
    check_cxx_compiler_flag(-fno-fat-lto-objects CXX_HAS_NO_FAT_LTO_FLAG)
    if(CMAKE_CXX_COMPILER_IS_GCC AND CXX_HAS_LTO_FLAG)
      find_program(CMAKE_GCC_AR
                   NAMES "${_CMAKE_TOOLCHAIN_PREFIX}gcc-ar${_CMAKE_TOOLCHAIN_SUFFIX}"
                         "${_CMAKE_TOOLCHAIN_PREFIX}gcc-ar"
                   HINTS ${_CMAKE_TOOLCHAIN_LOCATION})
      find_program(CMAKE_GCC_NM
                   NAMES "${_CMAKE_TOOLCHAIN_PREFIX}gcc-nm${_CMAKE_TOOLCHAIN_SUFFIX}"
                         "${_CMAKE_TOOLCHAIN_PREFIX}gcc-nm"
                   HINTS ${_CMAKE_TOOLCHAIN_LOCATION})
      find_program(CMAKE_GCC_RANLIB
                   NAMES "${_CMAKE_TOOLCHAIN_PREFIX}gcc-ranlib${_CMAKE_TOOLCHAIN_SUFFIX}"
                         "${_CMAKE_TOOLCHAIN_PREFIX}gcc-ranlib"
                   HINTS ${_CMAKE_TOOLCHAIN_LOCATION})
      if(CMAKE_GCC_AR AND CMAKE_GCC_NM AND CMAKE_GCC_RANLIB)
        set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -flto")
        if(CXX_HAS_NO_FAT_LTO_FLAG)
          set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -fno-fat-lto-objects")
        endif()
        set(CMAKE_AR "${CMAKE_GCC_AR}")
        set(CMAKE_NM "${CMAKE_GCC_NM}")
        set(CMAKE_RANLIB "${CMAKE_GCC_RANLIB}")
      else()
        message(
          WARNING
            "GCC indicates LTO support, but binutils wrappers could not be found. Disabling LTO.")
      endif()
    else()
      check_enable_compiler_flag(-flto)
      check_enable_compiler_flag(-fno-fat-lto-objects)
    endif()
  endif()

endfunction()