Merge pull request swiftlang#1922 from plemarquand/expose-build-record-args-hash

Author: plemarquand

Sources/SwiftDriver/IncrementalCompilation/BuildRecordInfo.swift

@@ -97,7 +97,7 @@ import class Dispatch.DispatchQueue
  else {
  return nil
  }
- let currentArgsHash = Self.computeArgsHash(parsedOptions)
+ let currentArgsHash = BuildRecordArguments.computeHash(parsedOptions)
  let compilationInputModificationDates =
  recordedInputModificationDates.filter { input, _ in
  input.type.isPartOfSwiftCompilation
@@ -113,16 +113,6 @@ import class Dispatch.DispatchQueue
  compilationInputModificationDates: compilationInputModificationDates)
  }
 
- private static func computeArgsHash(_ parsedOptionsArg: ParsedOptions
- ) -> String {
- var parsedOptions = parsedOptionsArg
- let hashInput = parsedOptions
- .filter { $0.option.affectsIncrementalBuild && $0.option.kind != .input}
- .map { $0.description } // The description includes the spelling of the option itself and, if present, its argument(s).
- .joined()
- return SHA256().hash(hashInput).hexadecimalRepresentation
- }
-
  /// Determine the input and output path for the build record
  private static func computeBuildRecordPath(
  outputFileMap: OutputFileMap?,
@@ -209,3 +199,15 @@ import class Dispatch.DispatchQueue
  buildRecordPath.parentDirectory
  }
 }
+
+public struct BuildRecordArguments {
+ /// Compute a hash of the parsed options that affect incremental builds.
+ public static func computeHash(_ parsedOptionsArg: ParsedOptions) -> String {
+ var parsedOptions = parsedOptionsArg
+ let hashInput = parsedOptions
+ .filter { $0.option.affectsIncrementalBuild && $0.option.kind != .input}
+ .map { $0.description } // The description includes the spelling of the option itself and, if present, its argument(s).
+ .joined()
+ return SHA256().hash(hashInput).hexadecimalRepresentation
+ }
+}