Merge pull request #704 from artemcm/55TBDToLinker

[5.5] Pass `.tbd` inputs down to the linker invocation.

Author: tkremenek

Sources/SwiftDriver/Jobs/DarwinToolchain+LinkerSupport.swift

@@ -268,6 +268,8 @@ extension DarwinToolchain {
           inputModules.append(input.file)
         } else if input.type == .object {
           inputPaths.append(input.file)
+        } else if input.type == .tbd {
+          inputPaths.append(input.file)
         } else if input.type == .llvmBitcode {
           inputPaths.append(input.file)
         }
@@ -291,6 +293,8 @@ extension DarwinToolchain {
           return [.flag("-add_ast_path"), .path(path.file)]
         } else if path.type == .object {
           return [.path(path.file)]
+        } else if path.type == .tbd {
+          return [.path(path.file)]
         } else if path.type == .llvmBitcode {
           return [.path(path.file)]
         } else {

Sources/SwiftDriver/Jobs/Planning.swift

@@ -330,7 +330,7 @@ extension Driver {
                                       addCompileJobGroup: addCompileJobGroup,
                                       addJobOutputs: addJobOutputs)
 
-    case .object, .autolink, .llvmBitcode:
+    case .object, .autolink, .llvmBitcode, .tbd:
       if linkerOutputType != nil {
         addLinkerInput(input)
       } else {

Tests/SwiftDriverTests/SwiftDriverTests.swift

@@ -1018,6 +1018,17 @@ final class SwiftDriverTests: XCTestCase {
       XCTAssertFalse(cmd.contains(.flag("-shared")))
     }
 
+    do {
+      // .tbd inputs are passed down to the linker.
+      var driver = try Driver(args: commonArgs + ["foo.dylib", "foo.tbd", "-target", "x86_64-apple-macosx10.15"], env: env)
+      let plannedJobs = try driver.planBuild()
+      let linkJob = plannedJobs[2]
+      XCTAssertEqual(linkJob.kind, .link)
+      let cmd = linkJob.commandLine
+      XCTAssertTrue(cmd.contains(.path(try VirtualPath(path: "foo.tbd"))))
+      XCTAssertTrue(cmd.contains(.path(try VirtualPath(path: "foo.dylib"))))
+    }
+
     do {
       // iOS target
       var driver = try Driver(args: commonArgs + ["-emit-library", "-target", "arm64-apple-ios10.0"], env: env)