cmake config: Use find_dependency to make linked targets available

Author: autoantwort

CMakeLists.txt

@@ -588,15 +588,15 @@ endif()
 if(NOT SKIP_INSTALL_LIBRARIES AND NOT SKIP_INSTALL_ALL)
     install(
         TARGETS avif
-        EXPORT ${PROJECT_NAME}-config
+        EXPORT ${PROJECT_NAME}-targets
         RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
         ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}"
         LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"
     )
 
     # Enable CMake configs in VCPKG mode
     if(BUILD_SHARED_LIBS OR VCPKG_TARGET_TRIPLET)
-        install(EXPORT ${PROJECT_NAME}-config DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME})
+        install(EXPORT ${PROJECT_NAME}-targets DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME})
 
         include(CMakePackageConfigHelpers)
         write_basic_package_version_file(
@@ -605,6 +605,29 @@ if(NOT SKIP_INSTALL_LIBRARIES AND NOT SKIP_INSTALL_ALL)
         install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}-config-version.cmake
                 DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}
         )
+
+        file(WRITE ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}-config.cmake.in "@PACKAGE_INIT@\n")
+        if(UNIX AND NOT BUILD_SHARED_LIBS)
+            file(APPEND ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}-config.cmake.in "
+                include(CMakeFindDependencyMacro)
+                set(CMAKE_THREAD_PREFER_PTHREADS ON)
+                set(THREADS_PREFER_PTHREAD_FLAG ON)
+                find_dependency(Threads)
+                ")
+        endif()
+        file(APPEND ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}-config.cmake.in "include(\${CMAKE_CURRENT_LIST_DIR}/${PROJECT_NAME}-targets.cmake)")
+
+        # Install CMake configuration export file.
+        configure_package_config_file(
+            ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}-config.cmake.in
+            ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}-config.cmake
+            INSTALL_DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}
+            NO_SET_AND_CHECK_MACRO NO_CHECK_REQUIRED_COMPONENTS_MACRO
+        )
+        install(
+            FILES ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}-config.cmake
+            DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}
+        )
     endif()
 
     # Handle both relative and absolute paths (e.g. NixOS) for a relocatable package