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Default to swift-frontend for querying supported frontend flags #503

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Merged
merged 1 commit into from
Feb 18, 2021
Merged

Default to swift-frontend for querying supported frontend flags #503

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25 changes: 13 additions & 12 deletions Sources/SwiftDriver/Jobs/EmitSupportedFeaturesJob.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -57,19 +57,20 @@ extension Driver {
fileSystem: FileSystem,
executor: DriverExecutor, env: [String: String])
throws -> Set<String> {
// If libSwiftScan library is present, use it to query
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()
// }
// }

// Fallback to invoking `swift-frontend -emit-supported-features`
// Invoke `swift-frontend -emit-supported-features`
let frontendOverride = try FrontendOverride(&parsedOptions, diagnosticsEngine)
frontendOverride.setUpForTargetInfo(toolchain)
defer { frontendOverride.setUpForCompilation(toolchain) }
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