libs/promises/CMakeLists.txt

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if (NOT COMMAND celix_subproject)
    #If COMMAND celix_subproject is not defined, this CMakeLists will
    #act as a top level project. Making the Celix::Promises useable
    #stand-alone

    cmake_minimum_required (VERSION 3.11)
    project(celix_Promises
            VERSION 1.0.0
            LANGUAGES CXX
    )

    include(GNUInstallDirs)

    set(CMAKE_CXX_FLAGS_DEBUG "-g -DDEBUG ${CMAKE_CXX_FLAGS_DEBUG}")

    set(PROMISES_STANDALONE ON)
else ()
    set(PROMISES_DEFAULT_ON ${CELIX_CXX})
    celix_subproject(PROMISES "Option to build the Promises library" ${PROMISES_DEFAULT_ON})
endif ()

if (PROMISES OR PROMISES_STANDALONE)
    message("The Celix::Promises implementation is still experiment and the api and behaviour will probably still change.")
    find_package(Threads)

    add_library(Promises INTERFACE)
    target_include_directories(Promises INTERFACE
        $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/api>
        $<INSTALL_INTERFACE:include/celix/promises>
    )
    target_link_libraries(Promises INTERFACE Threads::Threads)
    add_library(Celix::Promises ALIAS Promises)

    add_executable(PromiseExamples src/PromiseExamples.cc)
    target_link_libraries(PromiseExamples PRIVATE Celix::Promises)

    if (ENABLE_TESTING AND NOT PROMISE_STANDALONE)
        add_subdirectory(gtest)
    endif()

    install(TARGETS Promises EXPORT celix DESTINATION ${CMAKE_INSTALL_LIBDIR})
    install(DIRECTORY api/ DESTINATION include/celix/promises)

    if (PROMISE_STANDALONE)
        install(EXPORT celix NAMESPACE Celix:: DESTINATION share/CelixPromises/cmake FILE Targets.cmake COMPONENT cmake)
        install(FILES
                "cmake/CelixPromisesConfig.cmake"
                "cmake/CelixPromisesConfigVersion.cmake"
                DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/CelixPromises" COMPONENT cmake)
    endif ()

endif ()