Make -library-level a driver argument and pass it to the frontend

rdar://82458987

Author: xymus

Sources/SwiftDriver/Jobs/FrontendJobHelpers.swift

@@ -193,6 +193,7 @@ extension Driver {
     try commandLine.appendLast(.localizationPath, from: &parsedOptions)
     try commandLine.appendLast(.requireExplicitAvailability, from: &parsedOptions)
     try commandLine.appendLast(.requireExplicitAvailabilityTarget, from: &parsedOptions)
+    try commandLine.appendLast(.libraryLevel, from: &parsedOptions)
     try commandLine.appendLast(.lto, from: &parsedOptions)
     try commandLine.appendLast(.accessNotesPath, from: &parsedOptions)
     try commandLine.appendLast(.enableActorDataRaceChecks, .disableActorDataRaceChecks, from: &parsedOptions)

Sources/SwiftOptions/Options.swift

@@ -377,7 +377,7 @@ extension Option {
   public static let j: Option = Option("-j", .joinedOrSeparate, attributes: [.doesNotAffectIncrementalBuild], metaVar: "<n>", helpText: "Number of commands to execute in parallel")
   public static let LEQ: Option = Option("-L=", .joined, alias: Option.L, attributes: [.frontend, .doesNotAffectIncrementalBuild, .argumentIsPath], group: .linkerOption)
   public static let libc: Option = Option("-libc", .separate, helpText: "libc runtime library to use")
-  public static let libraryLevel: Option = Option("-library-level", .separate, attributes: [.helpHidden, .frontend, .noDriver], metaVar: "<level>", helpText: "Library distribution level 'api', 'spi' or 'other' (the default)")
+  public static let libraryLevel: Option = Option("-library-level", .separate, attributes: [.helpHidden, .frontend, .moduleInterface], metaVar: "<level>", helpText: "Library distribution level 'api', 'spi' or 'other' (the default)")
   public static let lineRange: Option = Option("-line-range", .separate, attributes: [.noInteractive, .noBatch, .indent], metaVar: "<n:n>", helpText: "<start line>:<end line>. Formats a range of lines (1-based). Can only be used with one input file.", group: .codeFormatting)
   public static let linkObjcRuntime: Option = Option("-link-objc-runtime", .flag, attributes: [.doesNotAffectIncrementalBuild])
   public static let lldbRepl: Option = Option("-lldb-repl", .flag, attributes: [.helpHidden, .noBatch], helpText: "LLDB-enhanced REPL mode", group: .modes)

Tests/SwiftDriverTests/SwiftDriverTests.swift

@@ -4853,6 +4853,15 @@ final class SwiftDriverTests: XCTestCase {
     }
   }
 
+  func testLibraryLevel() throws {
+    do {
+      var driver = try Driver(args: ["swiftc", "-library-level", "spi", "foo.swift"])
+      let plannedJobs = try driver.planBuild()
+      let job = plannedJobs[0]
+      XCTAssertTrue(job.commandLine.contains(subsequence: [.flag("-library-level"), .flag("spi")]))
+    }
+  }
+
   func testRelativeResourceDir() throws {
     do {
       var driver = try Driver(args: ["swiftc",