[clang] Enable making the `CompilerInstance` module dependency collector thread-safe (#137227)

The same principle as #135473, #135737, #136178, #136601 & #137059.

1 files changed, 8 insertions, 4 deletions

diff --git a/clang/lib/Frontend/CompilerInstance.cpp b/clang/lib/Frontend/CompilerInstance.cpp
index 2d6ab87..cbc9c9d 100644
--- a/clang/lib/Frontend/CompilerInstance.cpp
+++ b/clang/lib/Frontend/CompilerInstance.cpp
@@ -1257,10 +1257,14 @@ std::unique_ptr<CompilerInstance> CompilerInstance::cloneForModuleCompileImpl(
     Instance.GetDependencyDirectives =
         GetDependencyDirectives->cloneFor(Instance.getFileManager());
 
-  // If we're collecting module dependencies, we need to share a collector
-  // between all of the module CompilerInstances. Other than that, we don't
-  // want to produce any dependency output from the module build.
-  Instance.setModuleDepCollector(getModuleDepCollector());
+  if (ThreadSafeConfig) {
+    Instance.setModuleDepCollector(ThreadSafeConfig->getModuleDepCollector());
+  } else {
+    // If we're collecting module dependencies, we need to share a collector
+    // between all of the module CompilerInstances. Other than that, we don't
+    // want to produce any dependency output from the module build.
+    Instance.setModuleDepCollector(getModuleDepCollector());
+  }
   Inv.getDependencyOutputOpts() = DependencyOutputOptions();
 
   return InstancePtr;