[CMake] Build BlocksRuntime as object library

To avoid shippig BlocksRuntime as a separate library, build it as an
object library and include it in CoreFoundation static archive.

Author: kateinoigakukun

Sources/CoreFoundation/BlockRuntime/CMakeLists.txt

@@ -15,7 +15,9 @@
 # Build the vendored version of the BlocksRuntime library, which is used by
 # platforms that don't support libdispatch.
 
-add_library(BlocksRuntime
+# Build the BlocksRuntime as an object library, shipped as a part
+# of libCoreFoundation.
+add_library(BlocksRuntime OBJECT
     data.c
     runtime.c)
 
@@ -27,11 +29,4 @@ target_include_directories(BlocksRuntime PUBLIC
 set_target_properties(BlocksRuntime PROPERTIES
     POSITION_INDEPENDENT_CODE FALSE)
 
-add_library(BlocksRuntime::BlocksRuntime ALIAS BlocksRuntime)
-
-if(NOT BUILD_SHARED_LIBS)
-    set_property(GLOBAL APPEND PROPERTY Foundation_EXPORTS BlocksRuntime)
-    install(TARGETS BlocksRuntime
-        ARCHIVE DESTINATION lib/swift$<$<NOT:$<BOOL:${BUILD_SHARED_LIBS}>>:_static>/${SWIFT_SYSTEM_NAME}
-        LIBRARY DESTINATION lib/swift$<$<NOT:$<BOOL:${BUILD_SHARED_LIBS}>>:_static>/${SWIFT_SYSTEM_NAME})
-endif()
+set_property(GLOBAL APPEND PROPERTY Foundation_EXPORTS BlocksRuntime)

Sources/CoreFoundation/CMakeLists.txt

@@ -121,6 +121,7 @@ target_link_libraries(CoreFoundation
 if(CMAKE_SYSTEM_NAME STREQUAL WASI)
     # On WASI, we use vendored BlocksRuntime instead of the one from libdispatch
     add_subdirectory(BlockRuntime)
+    # Add BlocksRuntime object library to CoreFoundation static archive
     target_link_libraries(CoreFoundation PRIVATE BlocksRuntime)
 endif()