From 67d37016a4334de7ecbdaa36ca9d043316385f4a Mon Sep 17 00:00:00 2001
From: Xi Ge <xi_ge@apple.com>
Date: Mon, 19 Apr 2021 22:47:33 -0700
Subject: [PATCH] PrebuiltModuleGen: add an option for skipping the job
 execution

---
 Sources/swift-build-sdk-interfaces/main.swift | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Sources/swift-build-sdk-interfaces/main.swift b/Sources/swift-build-sdk-interfaces/main.swift
index f17c083bc..8d61815f9 100644
--- a/Sources/swift-build-sdk-interfaces/main.swift
+++ b/Sources/swift-build-sdk-interfaces/main.swift
@@ -44,6 +44,9 @@ let coreMode = CommandLine.arguments.contains("-core")
 /// Verbose to print more info
 let verbose = CommandLine.arguments.contains("-v")
 
+/// Skip executing the jobs
+let skipExecution = CommandLine.arguments.contains("-n")
+
 do {
   let sdkPath = try VirtualPath(path: sdkPathRaw).absolutePath!
   if !localFileSystem.exists(sdkPath) {
@@ -117,6 +120,15 @@ do {
                             executor: executor,
                             compilerExecutableDir: swiftcPath.parentDirectory)
     let (jobs, danglingJobs) = try driver.generatePrebuitModuleGenerationJobs(with: inputMap, into: outputDir, exhaustive: !coreMode)
+    if verbose {
+      Driver.stdErrQueue.sync {
+        stderrStream <<< "job count: \(jobs.count + danglingJobs.count)\n"
+        stderrStream.flush()
+      }
+    }
+    if skipExecution {
+      exit(0)
+    }
     let delegate = PrebuitModuleGenerationDelegate(jobs, diagnosticsEngine, verbose)
     do {
       try executor.execute(workload: DriverExecutorWorkload.init(jobs, nil, continueBuildingAfterErrors: true),