kc3-lang/libevent/cmake/AddEventLibrary.cmake

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• Hash : 55d1e20e
  Author :
  Date : 2019-07-12T00:00:12
  

  cmake: install shared library only if it was requested
  
    $ cmake -DEVENT__LIBRARY_TYPE=static ..
    ...
    CMake Error:
    Error evaluating generator expression:
  
      $<TARGET_FILE_DIR:event_core_shared>
  
    No target "event_core_shared"
  
  Fixes: #853
  Fixes: 669a53f3 ("cmake: set library names to be the same as with autotools")
  

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• cmake/AddEventLibrary.cmake

• include(CMakeParseArguments)
  
  set(LIBEVENT_SHARED_LIBRARIES "")
  set(LIBEVENT_STATIC_LIBRARIES "")
  
  macro(set_event_shared_lib_flags LIB_NAME)
      set_target_properties("${LIB_NAME}_shared" PROPERTIES
          COMPILE_FLAGS ${ARGN})
      set_target_properties("${LIB_NAME}_shared" PROPERTIES
          LINK_FLAGS ${ARGN})
  endmacro()
  
  macro(generate_pkgconfig LIB_NAME)
      set(prefix      ${CMAKE_INSTALL_PREFIX})
      set(exec_prefix ${CMAKE_INSTALL_PREFIX})
      set(libdir      ${CMAKE_INSTALL_PREFIX}/lib)
      set(includedir  ${CMAKE_INSTALL_PREFIX}/include)
  
      set(VERSION ${EVENT_ABI_LIBVERSION})
  
      set(LIBS         "")
      foreach (LIB ${LIB_PLATFORM})
          set(LIBS "${LIBS} -L${LIB}")
      endforeach()
  
      set(OPENSSL_LIBS "")
      foreach(LIB ${OPENSSL_LIBRARIES})
          set(OPENSSL_LIBS "${OPENSSL_LIBS} -L${LIB}")
      endforeach()
  
      configure_file("lib${LIB_NAME}.pc.in" "lib${LIB_NAME}.pc" @ONLY)
      install(
          FILES "${CMAKE_CURRENT_BINARY_DIR}/lib${LIB_NAME}.pc"
          DESTINATION "${CMAKE_INSTALL_PREFIX}/lib/pkgconfig"
      )
  endmacro()
  
  
  # Global variables that it uses:
  # - EVENT_ABI_LIBVERSION
  # - EVENT_ABI_LIBVERSION_CURRENT
  # - EVENT_ABI_LIBVERSION_REVISION
  # - EVENT_ABI_LIBVERSION_AGE
  # - EVENT_PACKAGE_RELEASE
  # - CMAKE_THREAD_LIBS_INIT LIB_PLATFORM
  # - OPENSSL_LIBRARIES
  # - HDR_PUBLIC
  # - EVENT_INSTALL_INCLUDE_DIR
  # - EVENT_SHARED_FLAGS
  # - EVENT_LIBRARY_STATIC
  # - EVENT_LIBRARY_SHARED
  #
  # Exported variables:
  # - LIBEVENT_SHARED_LIBRARIES
  # - LIBEVENT_STATIC_LIBRARIES
  macro(add_event_library LIB_NAME)
      cmake_parse_arguments(LIB
          "" # Options
          "VERSION" # One val
          "SOURCES;LIBRARIES" # Multi val
          ${ARGN}
      )
  
      set(ADD_EVENT_LIBRARY_TARGETS)
      set(ADD_EVENT_LIBRARY_INTERFACE)
  
      if (${EVENT_LIBRARY_STATIC})
          add_library("${LIB_NAME}_static" STATIC ${LIB_SOURCES})
          set_target_properties("${LIB_NAME}_static" PROPERTIES
              OUTPUT_NAME "${LIB_NAME}"
              CLEAN_DIRECT_OUTPUT 1)
          set_target_properties(
              "${LIB_NAME}_static" PROPERTIES
              PUBLIC_HEADER "${HDR_PUBLIC}")
  
          list(APPEND LIBEVENT_STATIC_LIBRARIES "${LIB_NAME}_static")
          list(APPEND ADD_EVENT_LIBRARY_TARGETS "${LIB_NAME}_static")
  
          set(ADD_EVENT_LIBRARY_INTERFACE "${LIB_NAME}_static")
      endif()
  
      if (${EVENT_LIBRARY_SHARED})
          add_library("${LIB_NAME}_shared" SHARED ${LIB_SOURCES})
  
          target_link_libraries("${LIB_NAME}_shared"
              ${CMAKE_THREAD_LIBS_INIT}
              ${LIB_PLATFORM}
              ${LIB_LIBRARIES})
  
          if (EVENT_SHARED_FLAGS)
              set_event_shared_lib_flags("${LIB_NAME}" "${EVENT_SHARED_FLAGS}")
          endif()
  
          if (WIN32)
              set_target_properties(
                  "${LIB_NAME}_shared" PROPERTIES
                  OUTPUT_NAME "${LIB_NAME}"
                  SOVERSION ${EVENT_ABI_LIBVERSION})
          elseif (APPLE)
              math(EXPR COMPATIBILITY_VERSION "${EVENT_ABI_LIBVERSION_CURRENT}+1")
              math(EXPR CURRENT_MINUS_AGE "${EVENT_ABI_LIBVERSION_CURRENT}-${EVENT_ABI_LIBVERSION_AGE}")
              set_target_properties(
                  "${LIB_NAME}_shared" PROPERTIES
                  OUTPUT_NAME "${LIB_NAME}-${EVENT_PACKAGE_RELEASE}.${CURRENT_MINUS_AGE}"
                  INSTALL_NAME_DIR "${CMAKE_INSTALL_PREFIX}/lib"
                  LINK_FLAGS "-compatibility_version ${COMPATIBILITY_VERSION} -current_version ${COMPATIBILITY_VERSION}.${EVENT_ABI_LIBVERSION_REVISION}")
          else()
              math(EXPR CURRENT_MINUS_AGE "${EVENT_ABI_LIBVERSION_CURRENT}-${EVENT_ABI_LIBVERSION_AGE}")
              set_target_properties(
                  "${LIB_NAME}_shared" PROPERTIES
                  OUTPUT_NAME "${LIB_NAME}-${EVENT_PACKAGE_RELEASE}"
                  VERSION "${CURRENT_MINUS_AGE}.${EVENT_ABI_LIBVERSION_AGE}.${EVENT_ABI_LIBVERSION_REVISION}"
                  SOVERSION "${CURRENT_MINUS_AGE}")
          endif()
  
          set_target_properties(
              "${LIB_NAME}_shared" PROPERTIES
              PUBLIC_HEADER "${HDR_PUBLIC}"
              CLEAN_DIRECT_OUTPUT 1)
  
          if (NOT WIN32)
              set(LIB_LINK_NAME
                  "${CMAKE_SHARED_LIBRARY_PREFIX}${LIB_NAME}${CMAKE_SHARED_LIBRARY_SUFFIX}")
  
              add_custom_command(TARGET ${LIB_NAME}_shared
                  POST_BUILD
                  COMMAND ${CMAKE_COMMAND} -E create_symlink
                      "$<TARGET_FILE_NAME:${LIB_NAME}_shared>"
                      "${LIB_LINK_NAME}"
                  WORKING_DIRECTORY "lib")
          endif()
  
          list(APPEND LIBEVENT_SHARED_LIBRARIES "${LIB_NAME}_shared")
          list(APPEND ADD_EVENT_LIBRARY_TARGETS "${LIB_NAME}_shared")
  
          set(ADD_EVENT_LIBRARY_INTERFACE "${LIB_NAME}_shared")
      endif()
  
      export(TARGETS ${ADD_EVENT_LIBRARY_TARGETS}
         FILE "${PROJECT_BINARY_DIR}/LibeventTargets.cmake"
         APPEND
      )
  
      install(TARGETS ${ADD_EVENT_LIBRARY_TARGETS}
          EXPORT LibeventTargets
          LIBRARY DESTINATION "lib" COMPONENT lib
          ARCHIVE DESTINATION "lib" COMPONENT lib
          RUNTIME DESTINATION "lib" COMPONENT lib
          PUBLIC_HEADER DESTINATION "include/event2"
          COMPONENT dev
      )
      if (NOT WIN32 AND ${EVENT_LIBRARY_SHARED})
          install(FILES
              "$<TARGET_FILE_DIR:${LIB_NAME}_shared>/${LIB_LINK_NAME}"
              DESTINATION "lib"
              COMPONENT lib)
      endif()
  
      add_library(${LIB_NAME} INTERFACE)
      target_link_libraries(${LIB_NAME} INTERFACE ${ADD_EVENT_LIBRARY_INTERFACE})
  
      generate_pkgconfig("${LIB_NAME}")
  endmacro()
  

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