Pass -use-static-resource-dir to frontend when linking statically

Author: drexin

Sources/SwiftDriver/Jobs/FrontendJobHelpers.swift

@@ -186,6 +186,15 @@ extension Driver {
     commandLine.appendPath(
       try AbsolutePath(validating: frontendTargetInfo.paths.runtimeResourcePath))
 
+    if parsedOptions.hasFlag(positive: .staticExecutable,
+                             negative: .noStaticExecutable,
+                             default: false) ||
+       parsedOptions.hasFlag(positive: .staticStdlib,
+                             negative: .noStaticStdlib,
+                             default: false) {
+      commandLine.appendFlag("-use-static-resource-dir")
+    }
+
     // -g implies -enable-anonymous-context-mangled-names, because the extra
     // metadata aids debugging.
     if parsedOptions.getLast(in: .g) != nil {

Tests/SwiftDriverTests/SwiftDriverTests.swift

@@ -2495,6 +2495,43 @@ final class SwiftDriverTests: XCTestCase {
       XCTAssertEqual(compileJob.outputs[1].file, .temporary(RelativePath("foo.swiftdoc")))
     }
   }
+
+  func testUseStaticResourceDir() throws {
+    do {
+      var driver = try Driver(args: ["swiftc", "-target", "x86_64-unknown-linux", "foo.swift"])
+      let plannedJobs = try driver.planBuild()
+      let job = plannedJobs[0]
+      XCTAssertFalse(job.commandLine.contains(.flag("-use-static-resource-dir")))
+    }
+
+    do {
+      var driver = try Driver(args: ["swiftc", "-target", "x86_64-unknown-linux", "-no-static-executable", "foo.swift"])
+      let plannedJobs = try driver.planBuild()
+      let job = plannedJobs[0]
+      XCTAssertFalse(job.commandLine.contains(.flag("-use-static-resource-dir")))
+    }
+
+    do {
+      var driver = try Driver(args: ["swiftc", "-target", "x86_64-unknown-linux", "-no-static-stdlib", "foo.swift"])
+      let plannedJobs = try driver.planBuild()
+      let job = plannedJobs[0]
+      XCTAssertFalse(job.commandLine.contains(.flag("-use-static-resource-dir")))
+    }
+
+    do {
+      var driver = try Driver(args: ["swiftc", "-target", "x86_64-unknown-linux", "-static-executable", "foo.swift"])
+      let plannedJobs = try driver.planBuild()
+      let job = plannedJobs[0]
+      XCTAssertTrue(job.commandLine.contains(.flag("-use-static-resource-dir")))
+    }
+
+    do {
+      var driver = try Driver(args: ["swiftc", "-target", "x86_64-unknown-linux", "-static-stdlib", "foo.swift"])
+      let plannedJobs = try driver.planBuild()
+      let job = plannedJobs[0]
+      XCTAssertTrue(job.commandLine.contains(.flag("-use-static-resource-dir")))
+    }
+  }
 }
 
 func assertString(