Merge pull request #18676 from apple/revert-18500-swift-syntax-dependency

Revert "build: extract libdispatch build for swift"

Author: tkremenek

CMakeLists.txt

@@ -942,11 +942,7 @@ add_subdirectory(stdlib)
 if(SWIFT_INCLUDE_TOOLS)
   add_subdirectory(include)
   add_subdirectory(lib)
-endif()
-
-include(SwiftExternal)
-
-if(SWIFT_INCLUDE_TOOLS)
+  
   # Always include this after including stdlib/!
   # Refer to the large comment above the add_subdirectory(stdlib) call.
   # https://bugs.swift.org/browse/SR-5975

cmake/modules/SwiftExternal.cmake

@@ -92,6 +92,67 @@ include_directories(BEFORE
 
 if("${CMAKE_SYSTEM_NAME}" STREQUAL "Linux")
   set(SOURCEKIT_DEFAULT_TARGET_SDK "LINUX")
+  if(SWIFT_BUILD_SOURCEKIT)
+    include(ExternalProject)
+    ExternalProject_Add(libdispatch
+                        SOURCE_DIR
+                          "${SWIFT_PATH_TO_LIBDISPATCH_SOURCE}"
+                        BINARY_DIR
+                          "${SWIFT_PATH_TO_LIBDISPATCH_BUILD}"
+                        CMAKE_ARGS
+                          -DCMAKE_C_COMPILER=${PATH_TO_CLANG_BUILD}/bin/clang
+                          -DCMAKE_CXX_COMPILER=${PATH_TO_CLANG_BUILD}/bin/clang++
+                          -DCMAKE_MAKE_PROGRAM=${CMAKE_MAKE_PROGRAM}
+                          -DCMAKE_SWIFT_COMPILER=$<TARGET_FILE:swift>c
+                          -DCMAKE_INSTALL_PREFIX=<INSTALL_DIR>
+                          -DENABLE_SWIFT=YES
+                        BUILD_BYPRODUCTS
+                          ${SWIFT_PATH_TO_LIBDISPATCH_BUILD}/src/${CMAKE_SHARED_LIBRARY_PREFIX}dispatch${CMAKE_SHARED_LIBRARY_SUFFIX}
+                          ${SWIFT_PATH_TO_LIBDISPATCH_BUILD}/${CMAKE_STATIC_LIBRARY_PREFIX}BlocksRuntime${CMAKE_STATIC_LIBRARY_SUFFIX}
+                        STEP_TARGETS
+                          configure
+                        BUILD_ALWAYS
+                          1)
+
+    # CMake does not like the addition of INTERFACE_INCLUDE_DIRECTORIES without
+    # the directory existing.  Just create the location which will be populated
+    # during the installation.
+    ExternalProject_Get_Property(libdispatch install_dir)
+    file(MAKE_DIRECTORY ${install_dir}/include)
+
+    # TODO(compnerd) this should be taken care of by the
+    # INTERFACE_INCLUDE_DIRECTORIES below
+    include_directories(AFTER
+                          ${SWIFT_PATH_TO_LIBDISPATCH_SOURCE}/src/BlocksRuntime
+                          ${SWIFT_PATH_TO_LIBDISPATCH_SOURCE})
+    add_dependencies(libdispatch
+                       swift
+                       copy_shim_headers
+                       swiftCore-${SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_LIB_SUBDIR}-${SWIFT_HOST_VARIANT_ARCH}
+                       swiftSwiftOnoneSupport-${SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_LIB_SUBDIR}-${SWIFT_HOST_VARIANT_ARCH}
+                       swiftCore-swiftmodule-${SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_LIB_SUBDIR}-${SWIFT_HOST_VARIANT_ARCH}
+                       swiftSwiftOnoneSupport-swiftmodule-${SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_LIB_SUBDIR}-${SWIFT_HOST_VARIANT_ARCH})
+  endif()
+
+  ExternalProject_Get_Property(libdispatch install_dir)
+  add_library(dispatch SHARED IMPORTED)
+  set_target_properties(dispatch
+                        PROPERTIES
+                          IMPORTED_LOCATION
+                            ${SWIFT_PATH_TO_LIBDISPATCH_BUILD}/src/${CMAKE_SHARED_LIBRARY_PREFIX}dispatch${CMAKE_SHARED_LIBRARY_SUFFIX}
+                          INTERFACE_INCLUDE_DIRECTORIES
+                            ${install_dir}/include
+                          IMPORTED_LINK_INTERFACE_LIBRARIES
+                            swiftCore-${SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_LIB_SUBDIR}-${SWIFT_HOST_VARIANT_ARCH})
+
+  add_library(BlocksRuntime STATIC IMPORTED)
+  set_target_properties(BlocksRuntime
+                        PROPERTIES
+                          IMPORTED_LOCATION
+                            ${SWIFT_PATH_TO_LIBDISPATCH_BUILD}/${CMAKE_STATIC_LIBRARY_PREFIX}BlocksRuntime${CMAKE_STATIC_LIBRARY_SUFFIX}
+                          INTERFACE_INCLUDE_DIRECTORIES
+                            ${SWIFT_PATH_TO_LIBDISPATCH_SOURCE}/src/BlocksRuntime)
+
   set(SOURCEKIT_NEED_EXPLICIT_LIBDISPATCH TRUE)
 endif()