build: add export targets for the appropriate components

Ensure that we export the Foundation libraries, plutil, and uuid for users of
Foundation against the build tree.

CMakeLists.txt

@@ -55,6 +55,8 @@ if(ENABLE_TESTING)
   add_subdirectory(TestFoundation)
 endif()
 
+add_subdirectory(cmake/modules)
+
 # TODO(compnerd) install as a Framework as that is how swift actually is built
 install(DIRECTORY
           ${CMAKE_CURRENT_BINARY_DIR}/CoreFoundation.framework/Headers/

Foundation/CMakeLists.txt

@@ -239,6 +239,8 @@ set_target_properties(FoundationXML PROPERTIES
   Swift_MODULE_DIRECTORY ${CMAKE_BINARY_DIR}/swift
   INTERFACE_INCLUDE_DIRECTORIES ${CMAKE_BINARY_DIR}/swift)
 
+set_property(GLOBAL APPEND PROPERTY Foundation_EXPORTS
+  Foundation FoundationNetworking FoundationXML)
 get_swift_host_arch(swift_arch)
 install(TARGETS Foundation FoundationNetworking FoundationXML
   ARCHIVE DESTINATION lib/swift$<$<NOT:$<BOOL:${BUILD_SHARED_LIBS}>>:_static>/$<LOWER_CASE:${CMAKE_SYSTEM_NAME}>

Tools/plutil/CMakeLists.txt

@@ -9,5 +9,6 @@ if(NOT CMAKE_SYSTEM_NAME STREQUAL Windows AND NOT CMAKE_SYSTEM_NAME STREQUAL Dar
     "SHELL:-Xlinker -rpath -Xlinker $$$$ORIGIN/../lib/swift/$<LOWER_CASE:${CMAKE_SYSTEM_NAME}>:$<TARGET_FILE_DIR:Foundation>")
 endif()
 
+set_property(GLOBAL APPEND PROPERTY Foundation_EXPORTS plutil)
 install(TARGETS plutil
   DESTINATION ${CMAKE_INSTALL_BINDIR})

cmake/modules/CMakeLists.txt

@@ -0,0 +1,7 @@
+
+set(Foundation_EXPORTS_FILE ${CMAKE_CURRENT_BINARY_DIR}/FoundationExports.cmake)
+configure_file(FoundationConfig.cmake.in
+  ${CMAKE_CURRENT_BINARY_DIR}/FoundationConfig.cmake)
+
+get_property(Foundation_EXPORTS GLOBAL PROPERTY Foundation_EXPORTS)
+export(TARGETS ${Foundation_EXPORTS} FILE ${Foundation_EXPORTS_FILE})

cmake/modules/FoundationConfig.cmake.in

@@ -0,0 +1,4 @@
+
+if(NOT TARGET Foundation)
+  include(@Foundation_EXPORTS_FILE@)
+endif()

uuid/CMakeLists.txt

@@ -20,3 +20,7 @@ if(CMAKE_SYSTEM_NAME STREQUAL Windows)
 endif()
 set_target_properties(uuid PROPERTIES
   POSITION_INDEPENDENT_CODE YES)
+
+if(NOT BUILD_SHARED_LIBS)
+  set_property(GLOBAL APPEND PROPERTY Foundation_EXPORTS uuid)
+endif()