1 files changed, 9 insertions, 1 deletions
diff --git a/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp b/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
index 9bd9180eff7..cf8348f2dec 100644
--- a/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
+++ b/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
@@ -112,6 +112,10 @@ static cl::opt<bool> EnableLoopLoadElim(
     "enable-loop-load-elim", cl::init(true), cl::Hidden,
     cl::desc("Enable the LoopLoadElimination Pass"));
 
+static cl::opt<bool>
+    EnablePrepareForThinLTO("prepare-for-thinlto", cl::init(false), cl::Hidden,
+                            cl::desc("Enable preparation for ThinLTO."));
+
 static cl::opt<bool> RunPGOInstrGen(
     "profile-generate", cl::init(false), cl::Hidden,
     cl::desc("Enable PGO instrumentation."));
@@ -163,7 +167,7 @@ PassManagerBuilder::PassManagerBuilder() {
     EnablePGOInstrGen = RunPGOInstrGen;
     PGOInstrGen = PGOOutputFile;
     PGOInstrUse = RunPGOInstrUse;
-    PrepareForThinLTO = false;
+    PrepareForThinLTO = EnablePrepareForThinLTO;
     PerformThinLTO = false;
 }
 
@@ -395,6 +399,10 @@ void PassManagerBuilder::populateModulePassManager(
     else if (!GlobalExtensions->empty() || !Extensions.empty())
       MPM.add(createBarrierNoopPass());
 
+    if (PrepareForThinLTO)
+      // Rename anon globals to be able to export them in the summary.
+      MPM.add(createNameAnonGlobalPass());
+
     addExtensionsToPM(EP_EnabledOnOptLevel0, MPM);
     return;
   }