pkg-mgmt.cmake

# ######################################################
option(USE_CONAN "enable package manager: conan" ON)
option(USE_VCPKG "enable package manager: vcpkg" OFF)

macro(load_package_manager)
    # ######################################################
    if (USE_CONAN)
        # run this : cd build && conan install ..
        # or: conan install . --install-folder build
        find_program(CONAN_CMD conan PATHS
                "/usr/local/bin"
                "$ENV{HOME}/.conan/bin"
                "$ENV{HOME}/.local/bin"
                )

        if (NOT CONAN_CMD)
            message(FATAL_ERROR "Conan: not found!")
        else ()
            message(STATUS "Conan: FOUND at ${CONAN_CMD}")
        endif ()

        if (NOT EXISTS ${CMAKE_BINARY_DIR}/conanbuildinfo.cmake)
            exec_program(${CONAN_CMD} ${CMAKE_CURRENT_SOURCE_DIR} ARGS "install . --install-folder ${CMAKE_BINARY_DIR}")
        endif ()

        include(${CMAKE_BINARY_DIR}/conanbuildinfo.cmake)
        conan_basic_setup()

        output_conan_include_dirs()
    endif ()

    # ######################################################
    if (USE_VCPKG)
        if (NOT DEFINED ENV{VCPKG_ROOT})
            find_program(VCPKG_CMD vcpkg PATHS
                    /usr/local/opt/vcpkg/bin
                    )

            if (VCPKG_CMD_FOUND)
                get_filename_component(VCPKG_ROOT $VCPKG_CMD DIRECTORY)
            endif ()
        else ()
            set(VCPKG_ROOT $ENV{VCPKG_ROOT})
        endif ()

        if (DEFINED ENV{VCPKG_TARGET_TRIPLET})
            set(VCPKG_TARGET_TRIPLET $ENV{VCPKG_TARGET_TRIPLET})
        endif ()

        if (DEFINED VCPKG_ROOT)
            set(VCPKG_FEATURE_FLAGS "versions")
            set(CMAKE_TOOLCHAIN_FILE "${VCPKG_ROOT}/scripts/buildsystems/vcpkg.cmake"
                    CACHE STRING "Vcpkg toolchain file")
            message(STATUS ">>> Using vcpkg with VCPKG_ROOT = ${VCPKG_ROOT}")
            message(STATUS "    CMAKE_TOOLCHAIN_FILE = ${CMAKE_TOOLCHAIN_FILE}")
            message(STATUS "    VCPKG_TARGET_TRIPLET = ${VCPKG_TARGET_TRIPLET}") # =x64-windows, ...
        else ()
            message(STATUS ">>> vcpkg ignored - you may install it at first")
        endif ()
    endif ()
endmacro()