[6.0.0] [CMake] [Darwin] Don't build the SDK overlays by default on Apple platforms

CMakeLists.txt

@@ -247,9 +247,16 @@ option(SWIFT_BUILD_CLANG_OVERLAYS
   "Build Swift overlays for the clang builtin modules"
   TRUE)
 
+# The SDK overlay is provided by the SDK itself on Darwin platforms.
+if(SWIFT_HOST_VARIANT_SDK IN_LIST SWIFT_DARWIN_PLATFORMS)
+  set(SWIFT_BUILD_DYNAMIC_SDK_OVERLAY_default FALSE)
+else()
+  set(SWIFT_BUILD_DYNAMIC_SDK_OVERLAY_default TRUE)
+endif()
+
 option(SWIFT_BUILD_DYNAMIC_SDK_OVERLAY
     "Build dynamic variants of the Swift SDK overlay"
-    TRUE)
+    "${SWIFT_BUILD_DYNAMIC_SDK_OVERLAY_default}")
 
 option(SWIFT_BUILD_STATIC_SDK_OVERLAY
     "Build static variants of the Swift SDK overlay"

benchmark/cmake/modules/AddSwiftBenchmarkSuite.cmake

@@ -714,7 +714,7 @@ function(swift_benchmark_compile)
 
   if(NOT SWIFT_BENCHMARK_BUILT_STANDALONE)
     set(stdlib_dependencies "swift-frontend" "swiftCore-${SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_LIB_SUBDIR}")
-    if(SWIFT_HOST_VARIANT_SDK IN_LIST SWIFT_DARWIN_PLATFORMS)
+    if((SWIFT_HOST_VARIANT_SDK IN_LIST SWIFT_DARWIN_PLATFORMS) AND SWIFT_BUILD_SDK_OVERLAY)
       list(APPEND stdlib_dependencies "swiftDarwin-${SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_LIB_SUBDIR}")
     endif()
     foreach(stdlib_dependency ${UNIVERSAL_LIBRARY_NAMES_${SWIFT_BENCHMARK_COMPILE_PLATFORM}})

cmake/modules/DarwinSDKs.cmake

@@ -48,7 +48,11 @@ if(swift_build_freestanding AND (SWIFT_FREESTANDING_FLAVOR STREQUAL "apple"))
   configure_target_variant(FREESTANDING-R  "FREESTANDING Release"         FREESTANDING R  "Release")
   configure_target_variant(FREESTANDING-S  "FREESTANDING MinSizeRelease"  FREESTANDING S  "MinSizeRelease")
 
-  set(SWIFT_FREESTANDING_TEST_DEPENDENCIES "Darwin")
+  if(SWIFT_BUILD_SDK_OVERLAY)
+    set(SWIFT_FREESTANDING_TEST_DEPENDENCIES "Darwin")
+  else()
+    set(SWIFT_FREESTANDING_TEST_DEPENDENCIES "")
+  endif()
 endif()
 
 # Compatible cross-compile SDKS for Darwin OSes: IOS, IOS_SIMULATOR, TVOS,

stdlib/private/CMakeLists.txt

@@ -1,12 +1,16 @@
-if(SWIFT_BUILD_SDK_OVERLAY)
+if(SWIFT_BUILD_SDK_OVERLAY
+   OR (SWIFT_BUILD_TEST_SUPPORT_MODULES
+       AND NOT SWIFT_BUILD_DYNAMIC_SDK_OVERLAY_default
+       AND (SWIFT_ENABLE_REFLECTION
+            OR NOT SWIFT_HOST_VARIANT_SDK IN_LIST SWIFT_DARWIN_PLATFORMS)))
   # SwiftPrivateThreadExtras makes use of Darwin/Glibc, which is part of the
-  # SDK overlay. It can't be built separately from the SDK overlay.
+  # SDK overlay. If the SDK overlay doesn't build by default, then it should
+  # be available in the SDK and DifferentiationUnittest can still be built.
+  # However, the overlay in the Apple SDKs requires the standard library to
+  # have reflection enabled.
   if(SWIFT_ENABLE_EXPERIMENTAL_DIFFERENTIABLE_PROGRAMMING)
     add_subdirectory(DifferentiationUnittest)
   endif()
-endif()
-
-if(SWIFT_BUILD_SDK_OVERLAY OR SWIFT_BUILD_TEST_SUPPORT_MODULES)
   add_subdirectory(SwiftPrivate)
   add_subdirectory(RuntimeUnittest)
   add_subdirectory(StdlibUnicodeUnittest)
@@ -18,9 +22,7 @@ if(SWIFT_BUILD_SDK_OVERLAY OR SWIFT_BUILD_TEST_SUPPORT_MODULES)
   # SwiftPrivateThreadExtras to ensure that the dependency targets are setup in
   # the correct order for Windows.
   add_subdirectory(StdlibUnittest)
-endif()
 
-if(SWIFT_BUILD_SDK_OVERLAY)
   add_subdirectory(OSLog)
 
   if(CMAKE_SYSTEM_NAME STREQUAL "Darwin")

stdlib/public/CMakeLists.txt

@@ -242,7 +242,7 @@ if(SWIFT_BUILD_STDLIB)
   add_subdirectory(core)
   add_subdirectory(SwiftOnoneSupport)
 
-  if(SWIFT_BUILD_CLANG_OVERLAYS)
+  if(SWIFT_BUILD_CLANG_OVERLAYS OR SWIFT_BUILD_TEST_SUPPORT_MODULES)
     add_subdirectory(ClangOverlays)
   endif()
 endif()
@@ -287,13 +287,12 @@ if(SWIFT_BUILD_REMOTE_MIRROR)
   add_subdirectory(SwiftRemoteMirror)
 endif()
 
-if(SWIFT_BUILD_SDK_OVERLAY OR SWIFT_BUILD_TEST_SUPPORT_MODULES)
+if(SWIFT_BUILD_SDK_OVERLAY OR (SWIFT_BUILD_TEST_SUPPORT_MODULES AND SWIFT_BUILD_DYNAMIC_SDK_OVERLAY_default))
   add_subdirectory(Platform)
 endif()
 
 if(SWIFT_BUILD_SDK_OVERLAY)
-  # On Apple platforms, we aren't building any overlays (other than Darwin in
-  # Platform above). Instead, we're picking them up from the SDK.
+  # On Apple platforms, we aren't building any overlays. Instead, we're picking them up from the SDK.
 
   if(WINDOWS IN_LIST SWIFT_SDKS)
     add_subdirectory(Windows)

test/Driver/loaded_module_trace_foundation.swift

@@ -9,12 +9,12 @@
 // CHECK: "arch":"{{[^"]*}}"
 // CHECK: "swiftmodules":[
 
-// Darwin, Swift and SwiftOnoneSupport is expected to be locally built;
+// Swift and SwiftOnoneSupport is expected to be locally built;
 // everything else comes from the SDK, built from swiftinterface.
 
 // CHECK-DAG: "{{[^"]*}}/ObjectiveC.swiftmodule{{(\\/[^"]+[.]swift(module|interface))?}}"
 // CHECK-DAG: "{{[^"]*}}/Dispatch.swiftmodule{{(\\/[^"]+[.]swift(module|interface))?}}"
-// CHECK-DAG: "{{[^"]*}}/Darwin.swiftmodule{{(\\/[^"]+[.]swiftmodule)?}}"
+// CHECK-DAG: "{{[^"]*}}/Darwin.swiftmodule{{(\\/[^"]+[.]swift(module|interface))?}}"
 // CHECK-DAG: "{{[^"]*}}/Foundation.swiftmodule{{(\\/[^"]+[.]swift(module|interface))?}}"
 // CHECK-DAG: "{{[^"]*}}/Swift.swiftmodule{{(\\/[^"]+[.]swiftmodule)?}}"
 // CHECK-DAG: "{{[^"]*}}/SwiftOnoneSupport.swiftmodule{{(\\/[^"]+[.]swiftmodule)?}}"

test/Driver/loaded_module_trace_header.swift

@@ -11,7 +11,7 @@
 // CHECK: "swiftmodules":[
 // CHECK-DAG: "{{[^"]*}}/ObjectiveC.swiftmodule{{(\\/[^"]+[.]swift(module|interface))?}}"
 // CHECK-DAG: "{{[^"]*}}/Dispatch.swiftmodule{{(\\/[^"]+[.]swift(module|interface))?}}"
-// CHECK-DAG: "{{[^"]*}}/Darwin.swiftmodule{{(\\/[^"]+[.]swiftmodule)?}}"
+// CHECK-DAG: "{{[^"]*}}/Darwin.swiftmodule{{(\\/[^"]+[.]swift(module|interface))?}}"
 // CHECK-DAG: "{{[^"]*}}/Foundation.swiftmodule{{(\\/[^"]+[.]swift(module|interface))?}}"
 // CHECK-DAG: "{{[^"]*}}/Swift.swiftmodule{{(\\/[^"]+[.]swiftmodule)?}}"
 // CHECK-DAG: "{{[^"]*}}/SwiftOnoneSupport.swiftmodule{{(\\/[^"]+[.]swiftmodule)?}}"

test/embedded/concurrency-actors.swift

@@ -9,6 +9,10 @@
 // REQUIRES: optimized_stdlib
 // REQUIRES: OS=macosx
 
+// The Darwin SDK overlay module in the macOS SDK cannot be imported in
+// embedded Swift mode.
+// XFAIL: OS=macosx
+
 import _Concurrency
 
 actor Number {

test/embedded/concurrency-async-let.swift

@@ -9,6 +9,10 @@
 // REQUIRES: optimized_stdlib
 // REQUIRES: OS=macosx
 
+// The Darwin SDK overlay module in the macOS SDK cannot be imported in
+// embedded Swift mode.
+// XFAIL: OS=macosx
+
 import _Concurrency
 
 func fib(_ n: Int) -> Int {

test/embedded/concurrency-simple.swift

@@ -9,6 +9,10 @@
 // REQUIRES: optimized_stdlib
 // REQUIRES: OS=macosx
 
+// The Darwin SDK overlay module in the macOS SDK cannot be imported in
+// embedded Swift mode.
+// XFAIL: OS=macosx
+
 import _Concurrency
 
 public func test() async -> Int {

test/embedded/darwin-bridging-header.swift

@@ -11,6 +11,10 @@
 // REQUIRES: VENDOR=apple
 // REQUIRES: OS=macosx
 
+// The Darwin SDK overlay module in the macOS SDK cannot be imported in
+// embedded Swift mode.
+// XFAIL: OS=macosx
+
 // BEGIN BridgingHeader.h
 
 #include <unistd.h>

test/embedded/darwin.swift

@@ -9,6 +9,10 @@
 // REQUIRES: VENDOR=apple
 // REQUIRES: OS=macosx
 
+// The Darwin SDK overlay module in the macOS SDK cannot be imported in
+// embedded Swift mode.
+// XFAIL: OS=macosx
+
 import Darwin
 
 @main

test/lit.cfg

@@ -1498,8 +1498,8 @@ if run_vendor == 'apple':
         '%s -modulewrap -target %s' %
         (config.swiftc, config.variant_triple))
     config.target_swift_emit_pcm = (
-        '%s -emit-pcm -target %s' %
-        (config.swiftc, config.variant_triple))
+        '%s -emit-pcm -target %s -sdk %r' %
+        (config.swiftc, config.variant_triple, config.variant_sdk))
     subst_target_swift_frontend_mock_sdk_after = \
         target_options_for_mock_sdk_after
     config.target_sil_opt = (

utils/build_swift/build_swift/driver_arguments.py

@@ -8,6 +8,7 @@
 
 import multiprocessing
 import os
+import platform
 
 import android.adb.commands
 
@@ -1145,7 +1146,7 @@ def create_argument_parser():
            help='build static variants of the Swift standard library')
 
     option('--build-swift-dynamic-sdk-overlay', toggle_true,
-           default=True,
+           default=platform.system() != "Darwin",
            help='build dynamic variants of the Swift SDK overlay')
 
     option('--build-swift-static-sdk-overlay', toggle_true,

utils/build_swift/tests/expected_options.py

@@ -8,6 +8,7 @@
 
 
 import multiprocessing
+import platform
 
 from build_swift import argparse
 from build_swift import defaults
@@ -80,7 +81,7 @@
     'build_runtime_with_host_compiler': False,
     'build_stdlib_deployment_targets': ['all'],
     'build_subdir': None,
-    'build_swift_dynamic_sdk_overlay': True,
+    'build_swift_dynamic_sdk_overlay': platform.system() != "Darwin",
     'build_swift_dynamic_stdlib': True,
     'build_swift_inspect': False,
     'build_swift_external_generic_metadata_builder': True,