From 62fec3d23d2325869e6eba0263b0b9f834c2067f Mon Sep 17 00:00:00 2001
From: Chuanqi Xu <yedeng.yd@linux.alibaba.com>
Date: Fri, 6 Sep 2024 15:20:08 +0800
Subject: [PATCH] [NFCI] [ClangScanDeps] [P1689] Use PreprocessorOnly Action
 for P1689

It is fine enough to use PreprocessorOnly action for P1689 format. We
don't need to read any PCH or module files.
---
 .../Tooling/DependencyScanning/DependencyScanningWorker.cpp   | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp b/clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp
index 1a21a4f5e30ff80..09ad5ebc7954cf8 100644
--- a/clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp
+++ b/clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp
@@ -430,7 +430,9 @@ class DependencyScanningAction : public tooling::ToolAction {
 
     std::unique_ptr<FrontendAction> Action;
 
-    if (ModuleName)
+    if (Format == ScanningOutputFormat::P1689)
+      Action = std::make_unique<PreprocessOnlyAction>();
+    else if (ModuleName)
       Action = std::make_unique<GetDependenciesByModuleNameAction>(*ModuleName);
     else
       Action = std::make_unique<ReadPCHAndPreprocessAction>();