AddEventLibrary.cmake

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Author : Azat Khuzhin
Date : 2018-11-22 23:00:11
Hash : c9a073ea
Message : cmake: introduce EVENT__LIBRARY_TYPE option Long time ago in [1] cmake build was forced to compile both libraries (SHARED and STATIC), since this is how our autotools build works. [1]: 7182c2f561570cd9ceb704623ebe9ae3608c7b43 ("cmake: build SHARED and STATIC libraries (like autoconf does)") And there is no way to configure this (and indeed you need to do this for MSVC for example), so let's introduce option for this -- EVENT__LIBRARY_TYPE. Plus now we have INTERFACE libraries, that we can use internally in libevent's cmake rules to avoid strict to _shared/_static variant of the libraries to link with samples/tests (we prefer SHARED over STATIC for linking). Also bump minimal cmake required version to 3.1 by the following reasons: - 3.1 is required for RPATH configuration under APPLE - 3.0 is required for add_library(INTERFACE) (did not found it in 2.8.x documentation) - remove extra conditions (anyway 3.1 was release 4 years ago, so I guess that most of the systems will have it)

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
# - 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()

        set_target_properties("${LIB_NAME}_shared" PROPERTIES
            OUTPUT_NAME "${LIB_NAME}"
            CLEAN_DIRECT_OUTPUT 1)
        set_target_properties(
            "${LIB_NAME}_shared" PROPERTIES
            PUBLIC_HEADER "${HDR_PUBLIC}")
        set_target_properties(
            "${LIB_NAME}_shared" PROPERTIES
            SOVERSION ${EVENT_ABI_LIBVERSION}
        )

        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
    )

    add_library(${LIB_NAME} INTERFACE)
    target_link_libraries(${LIB_NAME} INTERFACE ${ADD_EVENT_LIBRARY_INTERFACE})

    generate_pkgconfig("${LIB_NAME}")
endmacro()

kc3-lang/libevent/cmake/AddEventLibrary.cmake

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kc3-lang/libevent /cmake/AddEventLibrary.cmake