Merge pull request #948 from apple/revert-910-EmitSupportedFeaturesLib

Revert "Query compiler supported features from `libSwiftScan`, when one is present"

Author: edymtt

Sources/SwiftDriver/Jobs/EmitSupportedFeaturesJob.swift

@@ -59,18 +59,18 @@ extension Driver {
  fileSystem: FileSystem,
  executor: DriverExecutor, env: [String: String])
  throws -> Set<String> {
- // if libSwiftScan is present in the toolchain, query the compiler supported features
- // using the SwiftScan interface, instead of calling out to swift-frontend.
- let swiftScanLibPath = try Self.getScanLibPath(of: toolchain,
- hostTriple: hostTriple,
- env: env)
-
- if fileSystem.exists(swiftScanLibPath) {
- let libSwiftScanInstance = try SwiftScan(dylib: swiftScanLibPath)
- if libSwiftScanInstance.canQuerySupportedArguments() {
- return try libSwiftScanInstance.querySupportedArguments()
- }
- }
+ // TODO: Once we are sure libSwiftScan is deployed across supported platforms and architectures
+ // we should deploy it here.
+// let swiftScanLibPath = try Self.getScanLibPath(of: toolchain,
+// hostTriple: hostTriple,
+// env: env)
+//
+// if fileSystem.exists(swiftScanLibPath) {
+// let libSwiftScanInstance = try SwiftScan(dylib: swiftScanLibPath)
+// if libSwiftScanInstance.canQuerySupportedArguments() {
+// return try libSwiftScanInstance.querySupportedArguments()
+// }
+// }
 
  // Invoke `swift-frontend -emit-supported-features`
  let frontendOverride = try FrontendOverride(&parsedOptions, diagnosticsEngine)