CMake ZLIB

ExternalZlib.cmake

# IN MAIN PROJECT
list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")

# ExternalZlib.cmake

FetchContent_Declare(
        zlib
        GIT_REPOSITORY https://github.com/madler/zlib.git
        GIT_TAG v1.2.11
)
FetchContent_GetProperties(zlib)
if (NOT zlib_POPULATED)
    FetchContent_Populate(zlib)
    add_subdirectory(${zlib_SOURCE_DIR} ${zlib_BINARY_DIR})
endif()

message("zlib_SOURCE_DIR = ${zlib_SOURCE_DIR}")

target_include_directories(zlibstatic
        INTERFACE
        $<INSTALL_INTERFACE:include>
        $<BUILD_INTERFACE:${zlib_SOURCE_DIR}>
        $<BUILD_INTERFACE:${zlib_BINARY_DIR}>
        )
#add_library(ZLIB::zlibstatic ALIAS zlibstatic)
#add_library(ZLIB::ZLIB ALIAS zlibstatic)

message("CMAKE_CURRENT_LIST_DIR => ${CMAKE_CURRENT_LIST_DIR}")

install(TARGETS zlibstatic EXPORT zlibstatic-targets
        RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT zlibstatic
        LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR} COMPONENT zlibstatic
        ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR} COMPONENT zlibstatic
        RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT ZLIB
        LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR} COMPONENT ZLIB
        ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR} COMPONENT ZLIB)

#install(TARGETS zlibstatic EXPORT zlibstatic-targets
#        RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT ZLIB
#        LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR} COMPONENT ZLIB
#        ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR} COMPONENT ZLIB)


#set(_cmakedir_desc "Directory relative to CMAKE_INSTALL to install the cmake configuration files")
set(CMAKE_INSTALL_CMAKEDIR ${CMAKE_CURRENT_BINARY_DIR})
#if(NOT MSVC)
#    set(CMAKE_INSTALL_CMAKEDIR "${CMAKE_INSTALL_LIBDIR}/cmake/zlib" CACHE STRING "${_cmakedir_desc}")
#else()
#    set(CMAKE_INSTALL_CMAKEDIR "cmake" CACHE STRING "${_cmakedir_desc}")
#endif()
#mark_as_advanced(CMAKE_INSTALL_CMAKEDIR)

export(TARGETS zlibstatic
        NAMESPACE ZLIB::
        FILE ${CMAKE_INSTALL_CMAKEDIR}/zlibstatic-targets.cmake
        )
install(EXPORT zlibstatic-targets
        DESTINATION "${CMAKE_INSTALL_CMAKEDIR}"
        NAMESPACE ZLIB::
        COMPONENT zlibstatic-export)

install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_INSTALL_CMAKEDIR}/
        DESTINATION "${CMAKE_INSTALL_CMAKEDIR}"
        COMPONENT zlibstatic-export
        PATTERN zlibstatic-targets.cmake EXCLUDE
        )

include(CMakePackageConfigHelpers)
configure_package_config_file(
        "zlibstatic-config.cmake.in" "${CMAKE_CURRENT_BINARY_DIR}/zlibstatic-config.cmake"
        INSTALL_DESTINATION "./"
)

FindZLIB.cmake

set(ZLIB_FOUND TRUE)

message("FINDZLIB CALLED // ${THIRDPARTY_BINARY_DIR}/zlibstatic-targets.cmake")

if (EXISTS "${THIRDPARTY_BINARY_DIR}/zlibstatic-targets.cmake")
    set(ZLIB_LIBRARIES ZLIB::ZLIB)

    message("FINDZLIB: HAS TARGET!")

    include("${THIRDPARTY_BINARY_DIR}/zlibstatic-targets.cmake")

    if (NOT TARGET ZLIB::ZLIB)
        add_library(ZLIB::ZLIB STATIC IMPORTED)
        get_target_property(ZLIB_INTERFACE_INCLUDE_DIRECTORIES ZLIB::zlibstatic INTERFACE_INCLUDE_DIRECTORIES)
        get_target_property(ZLIB_IMPORTED_LOCATION_DEBUG ZLIB::zlibstatic IMPORTED_LOCATION_DEBUG)
        get_target_property(ZLIB_IMPORTED_LOCATION_RELEASE ZLIB::zlibstatic IMPORTED_LOCATION_RELEASE)
        get_target_property(ZLIB_IMPORTED_LOCATION_RELWITHDEBINFO ZLIB::zlibstatic IMPORTED_LOCATION_RELWITHDEBINFO)
        get_target_property(ZLIB_IMPORTED_LOCATION ZLIB::zlibstatic IMPORTED_LOCATION)
        set_target_properties(ZLIB::ZLIB PROPERTIES
                INTERFACE_INCLUDE_DIRECTORIES "${ZLIB_INTERFACE_INCLUDE_DIRECTORIES}"
                )

        if(ZLIB_IMPORTED_LOCATION_RELEASE)
            set_property(TARGET ZLIB::ZLIB APPEND PROPERTY
                    IMPORTED_CONFIGURATIONS RELEASE)
            set_target_properties(ZLIB::ZLIB PROPERTIES
                    IMPORTED_LOCATION_RELEASE "${ZLIB_IMPORTED_LOCATION_RELEASE}")
        endif()

        if(ZLIB_IMPORTED_LOCATION_DEBUG)
            set_property(TARGET ZLIB::ZLIB APPEND PROPERTY
                    IMPORTED_CONFIGURATIONS DEBUG)
            set_target_properties(ZLIB::ZLIB PROPERTIES
                    IMPORTED_LOCATION_DEBUG "${ZLIB_IMPORTED_LOCATION_DEBUG}")
        endif()

        if(NOT ZLIB_IMPORTED_LOCATION_RELEASE AND NOT ZLIB_IMPORTED_LOCATION_DEBUG)
            set_property(TARGET ZLIB::ZLIB APPEND PROPERTY
                    IMPORTED_LOCATION "${ZLIB_IMPORTED_LOCATION}")
        endif()
    endif()

else()
    set(ZLIB_LIBRARIES zlibstatic)
endif()