build: install cmake config

This makes it easier to consume dispatch via package managers such as vcpkg or Linux system ones

Author: ilya-fedin

cmake/modules/CMakeLists.txt

@@ -1,7 +1,17 @@
 
 set(DISPATCH_EXPORTS_FILE ${CMAKE_CURRENT_BINARY_DIR}/dispatchExports.cmake)
 configure_file(dispatchConfig.cmake.in
-  ${CMAKE_CURRENT_BINARY_DIR}/dispatchConfig.cmake)
+  ${CMAKE_CURRENT_BINARY_DIR}/dispatchConfig.cmake
+  @ONLY)
+file(COPY FindLibRT.cmake DESTINATION ${CMAKE_CURRENT_BINARY_DIR})
 
 get_property(DISPATCH_EXPORTS GLOBAL PROPERTY DISPATCH_EXPORTS)
 export(TARGETS ${DISPATCH_EXPORTS} FILE ${DISPATCH_EXPORTS_FILE})
+
+if(NOT ENABLE_SWIFT)
+  install(EXPORT dispatchExports DESTINATION ${INSTALL_TARGET_DIR}/cmake/dispatch)
+  install(FILES
+            ${CMAKE_CURRENT_BINARY_DIR}/dispatchConfig.cmake
+            ${CMAKE_CURRENT_BINARY_DIR}/FindLibRT.cmake
+          DESTINATION ${INSTALL_TARGET_DIR}/cmake/dispatch)
+endif()

cmake/modules/dispatchConfig.cmake.in

@@ -1,7 +1,10 @@
+include(CMakeFindDependencyMacro)
+list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}")
+find_dependency(LibRT)
 
 set(DISPATCH_HAS_SWIFT_SDK_OVERLAY @ENABLE_SWIFT@)
 
 if(NOT TARGET dispatch)
-  include(@DISPATCH_EXPORTS_FILE@)
+  include("${CMAKE_CURRENT_LIST_DIR}/dispatchExports.cmake")
 endif()
 

src/BlocksRuntime/CMakeLists.txt

@@ -13,7 +13,8 @@ if(WIN32)
 endif()
 
 target_include_directories(BlocksRuntime PUBLIC
-  ${CMAKE_CURRENT_SOURCE_DIR})
+  $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
+  $<INSTALL_INTERFACE:${INSTALL_BLOCK_HEADERS_DIR}>)
 if(HAVE_OBJC AND CMAKE_DL_LIBS)
   target_link_libraries(BlocksRuntime PUBLIC
     ${CMAKE_DL_LIBS})

src/CMakeLists.txt

@@ -89,10 +89,11 @@ if(HAVE_OBJC)
 endif()
 
 target_include_directories(dispatch PUBLIC
-  ${PROJECT_BINARY_DIR}
-  ${PROJECT_SOURCE_DIR}
-  ${CMAKE_CURRENT_SOURCE_DIR}
-  ${CMAKE_CURRENT_BINARY_DIR})
+  $<BUILD_INTERFACE:${PROJECT_BINARY_DIR}>
+  $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}>
+  $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
+  $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>
+  $<INSTALL_INTERFACE:${INSTALL_DISPATCH_HEADERS_DIR}/..>)
 target_include_directories(dispatch PRIVATE
   ${PROJECT_SOURCE_DIR}/private)