Merge pull request swiftlang#34859 from drodriguez/test-blocks-runtime-stub-as-stdlib

[tests] Compile BlocksRuntimeStub with stdlib compiler settings

Author: drodriguez

stdlib/private/BlocksRuntimeStubs/BlocksRuntime.c

@@ -0,0 +1,6 @@
+void
+#if defined(_WIN32)
+__declspec(dllexport)
+#endif
+_Block_release(void) {  }
+

stdlib/private/BlocksRuntimeStubs/CMakeLists.txt

@@ -0,0 +1,31 @@
+list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/../../../test/cmake/modules")
+
+include(SwiftTestUtils)
+
+foreach(SDK ${SWIFT_SDKS})
+  foreach(ARCH ${SWIFT_SDK_${SDK}_ARCHITECTURES})
+    get_swift_test_build_flavors(build_flavors "${SDK}")
+
+    foreach(BUILD_FLAVOR build_flavors)
+      get_swift_test_variant_suffix(VARIANT_SUFFIX "${SDK}" "${ARCH}" "${BUILD_FLAVOR}")
+
+      set(test_bin_dir "${CMAKE_BINARY_DIR}/test${VARIANT_SUFFIX}")
+
+      _add_swift_target_library_single(
+        BlocksRuntimeStub${VARIANT_SUFFIX}
+        BlocksRuntimeStub
+        SHARED
+        ARCHITECTURE ${ARCH}
+        SDK ${SDK}
+        INSTALL_IN_COMPONENT dev
+        BlocksRuntime.c
+      )
+      set_target_properties(BlocksRuntimeStub${VARIANT_SUFFIX} PROPERTIES
+        ARCHIVE_OUTPUT_DIRECTORY ${test_bin_dir}
+        LIBRARY_OUTPUT_DIRECTORY ${test_bin_dir}
+        RUNTIME_OUTPUT_DIRECTORY ${test_bin_dir}
+        OUTPUT_NAME BlocksRuntime)
+    endforeach()
+  endforeach()
+endforeach()
+

stdlib/private/CMakeLists.txt

@@ -29,9 +29,18 @@ if(SWIFT_BUILD_SDK_OVERLAY)
   if(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
     add_subdirectory(StdlibUnittestFoundationExtras)
   endif()
-  # Currently SwiftReflectionTest cannot be built on Windows, due to 
-  # dependencies on POSIX symbols 
+  # Currently SwiftReflectionTest cannot be built on Windows, due to
+  # dependencies on POSIX symbols
   if (SWIFT_INCLUDE_TESTS AND (NOT CMAKE_SYSTEM_NAME STREQUAL "Windows"))
     add_subdirectory(SwiftReflectionTest)
   endif()
 endif()
+
+# Keep in sync with stdlib/tools/CMakeLists.txt: swift-reflection-test is
+# only used when testing dynamic stdlib.
+if(SWIFT_BUILD_DYNAMIC_STDLIB AND SWIFT_INCLUDE_TESTS)
+  # NOTE create a stub BlocksRuntime library that can be used for the
+  # reflection tests
+  add_subdirectory(BlocksRuntimeStubs)
+endif()
+