[Diagnostics] Support for all the flags of the warning treating group

This commit adds support for the warning treating option group, including the following options: -warnings-as-errors, -no-warnings-as-errors, -Werror, and -Wwarning.
Options in this group are now preserved as-is. It is forbidden to reorder or drop any of them.
These changes reflect the modifications made to the frontend in swiftlang/swift#74466.

Author: DmT021

Sources/SwiftDriver/Driver/Driver.swift

@@ -2929,10 +2929,19 @@ extension Diagnostic.Message {
 extension Driver {
   static func validateWarningControlArgs(_ parsedOptions: inout ParsedOptions,
                                          diagnosticEngine: DiagnosticsEngine) {
-    if parsedOptions.hasArgument(.suppressWarnings) &&
-        parsedOptions.hasFlag(positive: .warningsAsErrors, negative: .noWarningsAsErrors, default: false) {
-      diagnosticEngine.emit(.error(Error.conflictingOptions(.warningsAsErrors, .suppressWarnings)),
-                            location: nil)
+    if parsedOptions.hasArgument(.suppressWarnings) {
+      if parsedOptions.hasFlag(positive: .warningsAsErrors, negative: .noWarningsAsErrors, default: false) {
+        diagnosticEngine.emit(.error(Error.conflictingOptions(.warningsAsErrors, .suppressWarnings)),
+                              location: nil)
+      }
+      if parsedOptions.hasArgument(.Wwarning) {
+        diagnosticEngine.emit(.error(Error.conflictingOptions(.Wwarning, .suppressWarnings)),
+                              location: nil)
+      }
+      if parsedOptions.hasArgument(.Werror) {
+        diagnosticEngine.emit(.error(Error.conflictingOptions(.Werror, .suppressWarnings)),
+                              location: nil)
+      }
     }
   }
 

Sources/SwiftDriver/Jobs/FrontendJobHelpers.swift

@@ -228,7 +228,11 @@ extension Driver {
     try commandLine.appendLast(.profileGenerate, from: &parsedOptions)
     try commandLine.appendLast(.profileUse, from: &parsedOptions)
     try commandLine.appendLast(.profileCoverageMapping, from: &parsedOptions)
-    try commandLine.appendLast(.warningsAsErrors, .noWarningsAsErrors, from: &parsedOptions)
+    try commandLine.appendAllExcept(
+      includeList: [.warningTreating], 
+      excludeList: [], 
+      from: &parsedOptions
+    )
     try commandLine.appendLast(.sanitizeEQ, from: &parsedOptions)
     try commandLine.appendLast(.sanitizeRecoverEQ, from: &parsedOptions)
     try commandLine.appendLast(.sanitizeAddressUseOdrIndicator, from: &parsedOptions)

Sources/SwiftOptions/Options.swift

@@ -640,7 +640,7 @@ extension Option {
   public static let noStrictImplicitModuleContext: Option = Option("-no-strict-implicit-module-context", .flag, attributes: [.helpHidden, .frontend], helpText: "Disable the strict forwarding of compilation context to downstream implicit module dependencies")
   public static let noToolchainStdlibRpath: Option = Option("-no-toolchain-stdlib-rpath", .flag, attributes: [.helpHidden, .doesNotAffectIncrementalBuild], helpText: "Do not add an rpath entry for the toolchain's standard library (default)")
   public static let noVerifyEmittedModuleInterface: Option = Option("-no-verify-emitted-module-interface", .flag, attributes: [.frontend, .noInteractive, .doesNotAffectIncrementalBuild], helpText: "Don't check that module interfaces emitted during compilation typecheck")
-  public static let noWarningsAsErrors: Option = Option("-no-warnings-as-errors", .flag, attributes: [.frontend], helpText: "Don't treat warnings as errors")
+  public static let noWarningsAsErrors: Option = Option("-no-warnings-as-errors", .flag, attributes: [.frontend], helpText: "Treat warnings as warnings", group: .warningTreating)
   public static let noWholeModuleOptimization: Option = Option("-no-whole-module-optimization", .flag, attributes: [.frontend, .noInteractive], helpText: "Disable optimizing input files together instead of individually")
   public static let driverScanDependenciesNonLib: Option = Option("-nonlib-dependency-scanner", .flag, attributes: [.helpHidden], helpText: "Use calls to `swift-frontend -scan-dependencies` instead of dedicated dependency scanning library")
   public static let nostartfiles: Option = Option("-nostartfiles", .flag, attributes: [.helpHidden, .frontend, .noInteractive, .doesNotAffectIncrementalBuild], helpText: "Do not link in the Swift language startup routines")
@@ -872,14 +872,16 @@ extension Option {
   public static let warnSwift3ObjcInferenceComplete: Option = Option("-warn-swift3-objc-inference-complete", .flag, attributes: [.helpHidden, .frontend, .doesNotAffectIncrementalBuild], helpText: "Deprecated, has no effect")
   public static let warnSwift3ObjcInferenceMinimal: Option = Option("-warn-swift3-objc-inference-minimal", .flag, attributes: [.helpHidden, .frontend, .doesNotAffectIncrementalBuild], helpText: "Deprecated, has no effect")
   public static let warnSwift3ObjcInference: Option = Option("-warn-swift3-objc-inference", .flag, alias: Option.warnSwift3ObjcInferenceComplete, attributes: [.helpHidden, .frontend, .doesNotAffectIncrementalBuild])
-  public static let warningsAsErrors: Option = Option("-warnings-as-errors", .flag, attributes: [.frontend], helpText: "Treat warnings as errors")
+  public static let warningsAsErrors: Option = Option("-warnings-as-errors", .flag, attributes: [.frontend], helpText: "Treat warnings as errors", group: .warningTreating)
   public static let weakLinkAtTarget: Option = Option("-weak-link-at-target", .flag, attributes: [.helpHidden, .frontend, .noDriver], helpText: "Weakly link symbols for declarations that were introduced at the deployment target. Symbols introduced before the deployment target are still strongly linked.")
+  public static let Werror: Option = Option("-Werror", .separate, attributes: [.helpHidden, .frontend], metaVar: "<diagnostic_group>", helpText: "Treat this warning group as error", group: .warningTreating)
   public static let wholeModuleOptimization: Option = Option("-whole-module-optimization", .flag, attributes: [.frontend, .noInteractive], helpText: "Optimize input files together instead of individually")
   public static let windowsSdkRoot: Option = Option("-windows-sdk-root", .separate, attributes: [.frontend, .argumentIsPath], metaVar: "<root>", helpText: "Windows SDK Root")
   public static let windowsSdkVersion: Option = Option("-windows-sdk-version", .separate, attributes: [.frontend], metaVar: "<version>", helpText: "Windows SDK Version")
   public static let wmo: Option = Option("-wmo", .flag, alias: Option.wholeModuleOptimization, attributes: [.helpHidden, .frontend, .noInteractive])
   public static let workingDirectoryEQ: Option = Option("-working-directory=", .joined, alias: Option.workingDirectory)
   public static let workingDirectory: Option = Option("-working-directory", .separate, metaVar: "<path>", helpText: "Resolve file paths relative to the specified directory")
+  public static let Wwarning: Option = Option("-Wwarning", .separate, attributes: [.helpHidden, .frontend], metaVar: "<diagnostic_group>", helpText: "Treat this warning group as warning", group: .warningTreating)
   public static let Xcc: Option = Option("-Xcc", .separate, attributes: [.frontend], metaVar: "<arg>", helpText: "Pass <arg> to the C/C++/Objective-C compiler")
   public static let XclangLinker: Option = Option("-Xclang-linker", .separate, attributes: [.helpHidden], metaVar: "<arg>", helpText: "Pass <arg> to Clang when it is use for linking.")
   public static let Xfrontend: Option = Option("-Xfrontend", .separate, attributes: [.helpHidden], metaVar: "<arg>", helpText: "Pass <arg> to the Swift frontend")
@@ -1747,12 +1749,14 @@ extension Option {
       Option.warnSwift3ObjcInference,
       Option.warningsAsErrors,
       Option.weakLinkAtTarget,
+      Option.Werror,
       Option.wholeModuleOptimization,
       Option.windowsSdkRoot,
       Option.windowsSdkVersion,
       Option.wmo,
       Option.workingDirectoryEQ,
       Option.workingDirectory,
+      Option.Wwarning,
       Option.Xcc,
       Option.XclangLinker,
       Option.Xfrontend,
@@ -1774,6 +1778,7 @@ extension Option {
     case linkerOption
     case modes
     case pluginSearch
+    case warningTreating
   }
 }
 
@@ -1798,6 +1803,8 @@ extension Option.Group {
         return "<mode options>"
       case .pluginSearch:
         return "<plugin search options>"
+      case .warningTreating:
+        return "<options to control warning treating>"
     }
   }
 }
@@ -1823,6 +1830,8 @@ extension Option.Group {
         return "MODES"
       case .pluginSearch:
         return nil
+      case .warningTreating:
+        return nil
     }
   }
 }

Tests/SwiftDriverTests/SwiftDriverTests.swift

@@ -5662,32 +5662,78 @@ final class SwiftDriverTests: XCTestCase {
       let plannedJobs = try driver.planBuild()
       XCTAssertEqual(plannedJobs.count, 1)
       let job = plannedJobs[0]
-      XCTAssertTrue(job.commandLine.contains(.flag("-warnings-as-errors")))
+      XCTAssertTrue(job.commandLine.contains(
+        subsequence: [.flag("-no-warnings-as-errors"), .flag("-warnings-as-errors")]
+      ))
     }
 
     do {
       var driver = try Driver(args: ["swift", "-warnings-as-errors", "-no-warnings-as-errors", "foo.swift"])
       let plannedJobs = try driver.planBuild()
       XCTAssertEqual(plannedJobs.count, 1)
       let job = plannedJobs[0]
-      XCTAssertTrue(job.commandLine.contains(.flag("-no-warnings-as-errors")))
+      XCTAssertTrue(job.commandLine.contains(
+        subsequence: [.flag("-warnings-as-errors"), .flag("-no-warnings-as-errors")]
+      ))
     }
 
     do {
       var driver = try Driver(args: ["swift", "-warnings-as-errors", "-no-warnings-as-errors", "-suppress-warnings", "foo.swift"])
       let plannedJobs = try driver.planBuild()
       XCTAssertEqual(plannedJobs.count, 1)
       let job = plannedJobs[0]
-      XCTAssertTrue(job.commandLine.contains(.flag("-no-warnings-as-errors")))
+      XCTAssertTrue(job.commandLine.contains(
+        subsequence: [.flag("-warnings-as-errors"), .flag("-no-warnings-as-errors")]
+      ))
       XCTAssertTrue(job.commandLine.contains(.flag("-suppress-warnings")))
     }
 
+    do {
+      var driver = try Driver(args: [
+        "swift",
+        "-warnings-as-errors",
+        "-no-warnings-as-errors",
+        "-Werror", "A",
+        "-Wwarning", "B",
+        "-Werror", "C",
+        "-Wwarning", "C",
+        "foo.swift",
+      ])
+      let plannedJobs = try driver.planBuild()
+      XCTAssertEqual(plannedJobs.count, 1)
+      let job = plannedJobs[0]
+      XCTAssertTrue(job.commandLine.contains(subsequence: [
+        .flag("-warnings-as-errors"),
+        .flag("-no-warnings-as-errors"),
+        .flag("-Werror"),
+        .flag("A"),
+        .flag("-Wwarning"),
+        .flag("B"),
+        .flag("-Werror"),
+        .flag("C"),
+        .flag("-Wwarning"),
+        .flag("C"),
+      ]))
+    }
+
     do {
       try assertDriverDiagnostics(args: ["swift", "-no-warnings-as-errors", "-warnings-as-errors", "-suppress-warnings", "foo.swift"]) {
         $1.expect(.error(Driver.Error.conflictingOptions(.warningsAsErrors, .suppressWarnings)))
       }
     }
 
+    do {
+      try assertDriverDiagnostics(args: ["swift", "-Wwarning", "test", "-suppress-warnings", "foo.swift"]) {
+        $1.expect(.error(Driver.Error.conflictingOptions(.Wwarning, .suppressWarnings)))
+      }
+    }
+
+    do {
+      try assertDriverDiagnostics(args: ["swift", "-Werror", "test", "-suppress-warnings", "foo.swift"]) {
+        $1.expect(.error(Driver.Error.conflictingOptions(.Werror, .suppressWarnings)))
+      }
+    }
+
     do {
       var driver = try Driver(args: ["swift", "-print-educational-notes", "foo.swift"])
       let plannedJobs = try driver.planBuild()