cmake: enable SwiftCompilerSources on Windows

Author: eeckstein

CMakeLists.txt

@@ -730,6 +730,17 @@ option(SWIFT_ENABLE_BACKTRACING
 set(SWIFT_DARWIN_DEPLOYMENT_VERSION_MACCATALYST "14.5" CACHE STRING
   "Minimum deployment target version for macCatalyst")
 
+# A tempoarary hack: force enabling HOSTTOOLS mode on Windows.
+# Right now, SwiftCompilerSources cannot be enabled for lldb because the
+# Windows build script builds lldb before swift and that fails with a missing
+# dependency on swiftrt (which is built within swift).
+# Swift and lldb are configured with the same cmake invocation and therefore
+# enabling bootstrapping for swift and disabling it for lldb only works
+# by hardcoding the bootstrapping mode in the cmake file.
+if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
+  set(BOOTSTRAPPING_MODE "HOSTTOOLS")
+endif()
+
 #
 # End of user-configurable options.
 #
@@ -898,6 +909,10 @@ if("${SWIFT_NATIVE_SWIFT_TOOLS_PATH}" STREQUAL "")
   # This is the normal case. We are not cross-compiling.
   set(SWIFT_NATIVE_SWIFT_TOOLS_PATH "${SWIFT_RUNTIME_OUTPUT_INTDIR}")
   set(SWIFT_EXEC_FOR_SWIFT_MODULES "${CMAKE_Swift_COMPILER}")
+  if(NOT SWIFT_EXEC_FOR_SWIFT_MODULES)
+    message(WARNING "BOOSTRAPPING set to OFF because no Swift compiler is defined")
+    set(BOOTSTRAPPING_MODE "OFF")
+  endif()
 elseif(BOOTSTRAPPING_MODE MATCHES "BOOTSTRAPPING.*")
   # If cross-compiling, we don't have to bootstrap. We can just use the previously
   # built native swiftc to build the swift compiler modules.

SwiftCompilerSources/CMakeLists.txt

@@ -106,6 +106,7 @@ function(add_swift_compiler_modules_library name)
       "-Xcc" "-std=c++17"
       "-Xcc" "-DCOMPILED_WITH_SWIFT" "-Xcc" "-DSWIFT_TARGET"
       "-Xcc" "-UIBOutlet" "-Xcc" "-UIBAction" "-Xcc" "-UIBInspectable")
+
   # Prior to 5.9, we have to use the experimental flag for C++ interop.
   if (CMAKE_Swift_COMPILER_VERSION VERSION_LESS 5.9)
     list(APPEND swift_compile_options "-Xfrontend" "-enable-experimental-cxx-interop")
@@ -167,7 +168,20 @@ function(add_swift_compiler_modules_library name)
   # under `include/swift`. These are either located next to the compiler (in case of open source toolchains) or
   # in the SDK (in case a Swift compiler from Xcode)
   get_filename_component(swift_exec_bin_dir ${ALS_SWIFT_EXEC} DIRECTORY)
-  list(APPEND sdk_option "-I" "${swift_exec_bin_dir}/../lib" "-I" "${sdk_path}/usr/lib")
+
+  if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
+    list(APPEND swift_compile_options "-static")
+
+    # For some reason the compiler doesn't find the libraries in the SDK directory when
+    # running inside the build script. Therefore we need `-resource-dir`.
+    string(REGEX REPLACE
+        "(.*/)Toolchains/([^+]*).*"
+        "\\1/Platforms/\\2/Windows.platform/Developer/SDKs/Windows.sdk/usr/lib/swift"
+        resource_dir "${ALS_WIFT_EXEC}")
+    list(APPEND sdk_option "-resource-dir" "${resource_dir}")
+  else()
+    list(APPEND sdk_option "-I" "${swift_exec_bin_dir}/../lib" "-I" "${sdk_path}/usr/lib")
+  endif()
 
   set(all_obj_files)
   set(all_module_targets)

test/embedded/optionset2.swift

@@ -5,6 +5,9 @@
 // REQUIRES: optimized_stdlib
 // REQUIRES: CODEGENERATOR=ARM
 
+// https://github.com/apple/swift/issues/73249
+// UNSUPPORTED: OS=windows-msvc
+
 protocol MyOptionSet: Equatable {
   init(rawValue: Int)
   init()

test/embedded/ouroboros-bug.swift

@@ -10,6 +10,9 @@
 // REQUIRES: optimized_stdlib
 // REQUIRES: CODEGENERATOR=ARM
 
+// https://github.com/apple/swift/issues/73249
+// UNSUPPORTED: OS=windows-msvc
+
 public func test() {}
 test()
 

test/embedded/stdlib-array.swift

@@ -5,6 +5,9 @@
 // REQUIRES: optimized_stdlib
 // REQUIRES: CODEGENERATOR=ARM
 
+// https://github.com/apple/swift/issues/73249
+// UNSUPPORTED: OS=windows-msvc
+
 public func test() {
   var array: [Int] = [1, 2, 3]
   array.append(42)

test/embedded/stdlib-basic.swift

@@ -4,6 +4,9 @@
 // REQUIRES: swift_in_compiler
 // REQUIRES: CODEGENERATOR=ARM
 
+// https://github.com/apple/swift/issues/73249
+// UNSUPPORTED: OS=windows-msvc
+
 public func bool() -> Bool {
   return true
 }

test/embedded/stdlib-dictionary.swift

@@ -4,6 +4,9 @@
 // REQUIRES: swift_in_compiler
 // REQUIRES: optimized_stdlib
 
+// https://github.com/apple/swift/issues/73249
+// UNSUPPORTED: OS=windows-msvc
+
 public func test() {
   var d: [Int:Int] = [1: 2, 3: 4, 5: 6]
   d[8] = 9

test/embedded/stdlib-random.swift

@@ -4,6 +4,9 @@
 // REQUIRES: swift_in_compiler
 // REQUIRES: optimized_stdlib
 
+// https://github.com/apple/swift/issues/73249
+// UNSUPPORTED: OS=windows-msvc
+
 public func test() {
   Bool.random()
   Int.random(in: 0 ..< 100)

test/embedded/stdlib-set.swift

@@ -5,6 +5,9 @@
 // REQUIRES: optimized_stdlib
 // REQUIRES: CODEGENERATOR=ARM
 
+// https://github.com/apple/swift/issues/73249
+// UNSUPPORTED: OS=windows-msvc
+
 public func test() {
   var s: Set<Int> = [1, 2, 3]
   s.insert(42)

test/embedded/stdlib-types.swift

@@ -5,6 +5,9 @@
 // REQUIRES: optimized_stdlib
 // REQUIRES: CODEGENERATOR=ARM
 
+// https://github.com/apple/swift/issues/73249
+// UNSUPPORTED: OS=windows-msvc
+
 class MyClass {}
 
 public func test() {