Update CMake settings to match recent package changes (#497)

A few fixes to the CMake and package build settings:

- Enable Swift 6 language mode, to match the package which now uses this
language mode due to the change which bumped `swift-tools-version` to
6.0.
- Add SourceLocation macro-related source files, which were missing.
- Add fake `visionOS 99.0` OS version to our `_distantFuture`
availability definition.
- Clean up experimental/upcoming features which are no longer needed.

### Checklist:

- [x] Code and documentation should follow the style of the [Style
Guide](https://github.com/apple/swift-testing/blob/main/Documentation/StyleGuide.md).
- [x] If public symbols are renamed or modified, DocC references should
be updated.

Author: stmontgomery

CMakeLists.txt

@@ -25,6 +25,7 @@ set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
 
 set(CMAKE_MSVC_RUNTIME_LIBRARY MultiThreadedDLL)
 set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_Swift_LANGUAGE_VERSION 6)
 set(CMAKE_Swift_MODULE_DIRECTORY ${CMAKE_BINARY_DIR}/swift)
 
 add_subdirectory(Sources)

Package.swift

@@ -119,7 +119,6 @@ extension Array where Element == PackageDescription.SwiftSetting {
   static var packageSettings: Self {
     availabilityMacroSettings + [
       .unsafeFlags(["-require-explicit-sendable"]),
-      .enableExperimentalFeature("StrictConcurrency"),
       .enableUpcomingFeature("ExistentialAny"),
 
       .enableExperimentalFeature("AccessLevelOnImport"),

Sources/Testing/CMakeLists.txt

@@ -55,6 +55,7 @@ add_library(Testing
   SourceAttribution/Expression+Macro.swift
   SourceAttribution/SourceContext.swift
   SourceAttribution/SourceLocation.swift
+  SourceAttribution/SourceLocation+Macro.swift
   Support/Additions/ArrayAdditions.swift
   Support/Additions/CollectionDifferenceAdditions.swift
   Support/Additions/CommandLineAdditions.swift

Sources/TestingMacros/CMakeLists.txt

@@ -37,6 +37,7 @@ include(AvailabilityDefinitions)
 include(CompilerSettings)
 add_executable(TestingMacros
   ConditionMacro.swift
+  SourceLocationMacro.swift
   SuiteDeclarationMacro.swift
   Support/Additions/DeclGroupSyntaxAdditions.swift
   Support/Additions/EditorPlaceholderExprSyntaxAdditions.swift

cmake/modules/shared/AvailabilityDefinitions.cmake

@@ -17,4 +17,4 @@ add_compile_options(
   "SHELL:$<$<COMPILE_LANGUAGE:Swift>:-Xfrontend -enable-experimental-feature -Xfrontend \"AvailabilityMacro=_clockAPI:macOS 13.0, iOS 16.0, watchOS 9.0, tvOS 16.0\">"
   "SHELL:$<$<COMPILE_LANGUAGE:Swift>:-Xfrontend -enable-experimental-feature -Xfrontend \"AvailabilityMacro=_regexAPI:macOS 13.0, iOS 16.0, tvOS 16.0, watchOS 9.0\">"
   "SHELL:$<$<COMPILE_LANGUAGE:Swift>:-Xfrontend -enable-experimental-feature -Xfrontend \"AvailabilityMacro=_swiftVersionAPI:macOS 13.0, iOS 16.0, tvOS 16.0, watchOS 9.0\">"
-  "SHELL:$<$<COMPILE_LANGUAGE:Swift>:-Xfrontend -enable-experimental-feature -Xfrontend \"AvailabilityMacro=_distantFuture:macOS 99.0, iOS 99.0, watchOS 99.0, tvOS 99.0\">")
+  "SHELL:$<$<COMPILE_LANGUAGE:Swift>:-Xfrontend -enable-experimental-feature -Xfrontend \"AvailabilityMacro=_distantFuture:macOS 99.0, iOS 99.0, watchOS 99.0, tvOS 99.0, visionOS 99.0\">")

cmake/modules/shared/CompilerSettings.cmake

@@ -11,11 +11,9 @@
 add_compile_options(
   "SHELL:$<$<COMPILE_LANGUAGE:Swift>:-Xfrontend -require-explicit-sendable>")
 add_compile_options(
-  "SHELL:$<$<COMPILE_LANGUAGE:Swift>:-Xfrontend -enable-experimental-feature -Xfrontend StrictConcurrency>"
   "SHELL:$<$<COMPILE_LANGUAGE:Swift>:-Xfrontend -enable-experimental-feature -Xfrontend AccessLevelOnImport>")
 add_compile_options(
   "SHELL:$<$<COMPILE_LANGUAGE:Swift>:-Xfrontend -enable-upcoming-feature -Xfrontend ExistentialAny>"
-  "SHELL:$<$<COMPILE_LANGUAGE:Swift>:-Xfrontend -enable-upcoming-feature -Xfrontend InferSendableFromCaptures>"
   "SHELL:$<$<COMPILE_LANGUAGE:Swift>:-Xfrontend -enable-upcoming-feature -Xfrontend InternalImportsByDefault>")
 
 # Platform specific defines.