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List Swift compiler upcoming and experimental feature flags. (Note: the second script below, swift-list-features.sh, is probably the more useful one of the two. Unfortunately, I can't reorder them.)
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| #!/bin/zsh | |
| # Test if the Swift compiler knows about a particular language feature. | |
| # | |
| # Usage: | |
| # | |
| # swift-has-feature [--swift SWIFT_PATH] FEATURE | |
| # | |
| # The exit code signals success (= the compiler knows this feature) or failure. | |
| # | |
| # Example: | |
| # | |
| # swift-has-feature FullTypedThrows | |
| # swift-has-feature --swift /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-01-04-a.xctoolchain/usr/bin/swift FullTypedThrows | |
| # | |
| # The feature be an upcoming or experimental language feature, | |
| # such as `"StrictConcurrency"` or `"FullTypedThrows"`. | |
| # | |
| # Unfortunately, the script can’t tell you whether the feature in question | |
| # is upcoming or experimental or neither. Use swift-list-features.sh for that. | |
| usage="swift-has-feature [--swift <path_to_swift>] [--silent] <feature>" | |
| zmodload zsh/zutil | |
| zparseopts -D -F -- -swift:=arg_swift_path -silent=flag_silent || exit 1 | |
| if test -z "$1"; then | |
| echo "Usage: $usage" | |
| exit | |
| fi | |
| swift_path=${arg_swift_path[-1]} | |
| if test -z "$swift_path"; then | |
| swift_path="swift" | |
| fi | |
| # Print compiler version | |
| if test -z "$flag_silent"; then | |
| "$swift_path" --version | |
| fi | |
| "$swift_path" \ | |
| -enable-upcoming-feature "$1" \ | |
| -enable-experimental-feature "$1" \ | |
| - << END_OF_SWIFT_SCRIPT | |
| import Foundation | |
| #if hasFeature($1) | |
| exit(EXIT_SUCCESS) | |
| #else | |
| exit(EXIT_FAILURE) | |
| #endif | |
| END_OF_SWIFT_SCRIPT | |
| if test $? -eq 0; then | |
| if test -z "$flag_silent"; then | |
| echo "Supported: Swift compiler knows feature '$1'" | |
| fi | |
| else | |
| if test -z "$flag_silent"; then | |
| echo "Not supported: Swift compiler doesn’t know feature '$1'" | |
| fi | |
| exit 1 | |
| fi |
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| #!/bin/bash | |
| # List Swift language features the compiler knows about. | |
| # | |
| # Usage: | |
| # | |
| # swift-list-features [version] # default: main branch | |
| # | |
| # Examples: | |
| # | |
| # swift-list-features # Queries main branch | |
| # swift-list-features 5.9 # Queries release/5.9 branch | |
| # | |
| # This script uses curl to download the file in which the language features | |
| # are defined from the Swift repo and uses Clang to parse it. | |
| # | |
| # Original author: Gor Gyolchanyan | |
| # <https://forums.swift.org/t/how-to-test-if-swiftc-supports-an-upcoming-experimental-feature/69095/10> | |
| # | |
| # Enhanced/modified by: Ole Begemann | |
| swift_version=$1 | |
| if test -z "$swift_version" || test "$swift_version" = "main"; then | |
| branch="main" | |
| else | |
| branch="release/${swift_version}" | |
| fi | |
| GITHUB_URL="https://raw.githubusercontent.com/apple/swift/${branch}/include/swift/Basic/Features.def" | |
| FEATURES_DEF_FILE="$(curl --fail-with-body --silent "${GITHUB_URL}")" | |
| curlStatus=$? | |
| if test $curlStatus -ne 0; then | |
| echo "$FEATURES_DEF_FILE" | |
| echo "Error: failed to download '$GITHUB_URL'. Invalid URL?" | |
| exit $curlStatus | |
| fi | |
| echo "Swift language features in $branch" | |
| echo "======================================" | |
| clang --preprocess --no-line-commands -nostdinc -x c - <<EOF | sort | |
| #define LANGUAGE_FEATURE(FeatureName, SENumber, Description, ...) FeatureName | |
| #define UPCOMING_FEATURE(FeatureName, SENumber, Version) [Upcoming] FeatureName (Swift Version) | |
| #define EXPERIMENTAL_FEATURE(FeatureName, AvailableInProd) [Experimental] FeatureName | |
| ${FEATURES_DEF_FILE} | |
| EOF |
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Example output of
swift-list-featuresfor Swift 5.10:$ swift-list-features.sh 5.10 Swift language features in release/5.10 ====================================== Actors AsyncAwait AttachedMacros BuiltinAssumeAlignment BuiltinBuildComplexEqualityExecutor BuiltinBuildExecutor BuiltinBuildMainExecutor BuiltinContinuation BuiltinCopy BuiltinCreateAsyncTaskInGroup BuiltinCreateTaskGroupWithFlags BuiltinExecutor BuiltinHopToActor BuiltinIntLiteralAccessors BuiltinJob BuiltinStackAlloc BuiltinTaskGroupWithArgument BuiltinTaskRunInline BuiltinUnprotectedAddressOf BuiltinUnprotectedStackAlloc ConcurrentFunctions EffectfulProp ExtensionMacroAttr ExtensionMacros FreestandingExpressionMacros FreestandingMacros GlobalActors ImplicitSelfCapture InheritActorContext LexicalLifetimes Macros MarkerProtocol MoveOnly MoveOnlyResilientTypes NewCxxMethodSafetyHeuristics NoAsyncAvailability ParameterPacks PrimaryAssociatedTypes2 RethrowsProtocol Sendable SpecializeAttributeWithAvailability UnavailableFromAsync UnsafeInheritExecutor [Experimental] ASTGenTypes [Experimental] AccessLevelOnImport [Experimental] AdditiveArithmeticDerivedConformances [Experimental] BuiltinMacros [Experimental] BuiltinModule [Experimental] CodeItemMacros [Experimental] DifferentiableProgramming [Experimental] Embedded [Experimental] FlowSensitiveConcurrencyCaptures [Experimental] ForwardModeDifferentiation [Experimental] GenerateBindingsForThrowingFunctionsInCXX [Experimental] ImplicitSome [Experimental] ImportSymbolicCXXDecls [Experimental] LayoutPrespecialization [Experimental] LayoutStringValueWitnesses [Experimental] LayoutStringValueWitnessesInstantiation [Experimental] LazyImmediate [Experimental] ModuleInterfaceExportAs [Experimental] MoveOnlyClasses [Experimental] MoveOnlyEnumDeinits [Experimental] MoveOnlyPartialConsumption [Experimental] MoveOnlyTuples [Experimental] NamedOpaqueTypes [Experimental] NoImplicitCopy [Experimental] OldOwnershipOperatorSpellings [Experimental] OneWayClosureParameters [Experimental] OpaqueTypeErasure [Experimental] ParserASTGen [Experimental] ParserDiagnostics [Experimental] ParserRoundTrip [Experimental] ParserValidation [Experimental] PlaygroundExtendedCallbacks [Experimental] RawLayout [Experimental] ReferenceBindings [Experimental] SendNonSendable [Experimental] SendableCompletionHandlers [Experimental] StaticAssert [Experimental] StrictConcurrency [Experimental] SymbolLinkageMarkers [Experimental] ThenStatements [Experimental] TupleConformances [Experimental] TypeWitnessSystemInference [Upcoming] BareSlashRegexLiterals (Swift 6) [Upcoming] ConciseMagicFile (Swift 6) [Upcoming] DeprecateApplicationMain (Swift 6) [Upcoming] DisableOutwardActorInference (Swift 6) [Upcoming] ExistentialAny (Swift 7) [Upcoming] ForwardTrailingClosures (Swift 6) [Upcoming] GlobalConcurrency (Swift 6) [Upcoming] ImportObjcForwardDeclarations (Swift 6) [Upcoming] IsolatedDefaultValues (Swift 6)