Add a config CMake (#752)

Signed-off-by: Juan Cruz Viotti <[email protected]>

CMakeLists.txt

@@ -20,7 +20,23 @@ option(JSONBINPACK_DOCS "Build the JSON BinPack documentation" OFF)
 option(JSONBINPACK_ADDRESS_SANITIZER "Build JSON BinPack with an address sanitizer" OFF)
 option(JSONBINPACK_UNDEFINED_SANITIZER "Build JSON BinPack with an undefined behavior sanitizer" OFF)
 
-# TODO: Generate (and test) CMake config
+# TODO: Test CMake config
+if(PROJECT_IS_TOP_LEVEL)
+  include(GNUInstallDirs)
+  include(CMakePackageConfigHelpers)
+  configure_package_config_file(
+    config.cmake.in
+    "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}-config.cmake"
+    INSTALL_DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}")
+  write_basic_package_version_file(
+    "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}-config-version.cmake"
+    COMPATIBILITY SameMajorVersion)
+  install(FILES
+    "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}-config-version.cmake"
+    "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}-config.cmake"
+    DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}"
+    COMPONENT sourcemeta_jsonbinpack_dev)
+endif()
 
 # Dependencies
 find_package(JSONToolkit REQUIRED)

config.cmake.in

@@ -0,0 +1,7 @@
+@PACKAGE_INIT@
+
+# TODO: Support component-based `find_package`
+find_package(JSONToolkit REQUIRED)
+include("${CMAKE_CURRENT_LIST_DIR}/sourcemeta_jsonbinpack_runtime.cmake")
+include("${CMAKE_CURRENT_LIST_DIR}/sourcemeta_jsonbinpack_compiler.cmake")
+check_required_components("@PROJECT_NAME@")