Index: compiler-rt/lib/profile/GCDAProfiling.c
===================================================================
diff --git a/compiler-rt/lib/profile/GCDAProfiling.c b/compiler-rt/lib/profile/GCDAProfiling.c
--- a/compiler-rt/lib/profile/GCDAProfiling.c
+++ b/compiler-rt/lib/profile/GCDAProfiling.c
@@ -619,7 +619,7 @@
   fn_list_insert(&flush_fn_list, fn);
 }
 
-void __gcov_flush() {
+void __custom_llvm_gcov_flush() {
   struct fn_node* curr = flush_fn_list.head;
 
   while (curr) {
diff --git a/llvm/lib/Transforms/Instrumentation/GCOVProfiling.cpp b/llvm/lib/Transforms/Instrumentation/GCOVProfiling.cpp
index 9af64ed332c..bcebe303ff4 100644
--- a/llvm/lib/Transforms/Instrumentation/GCOVProfiling.cpp
+++ b/llvm/lib/Transforms/Instrumentation/GCOVProfiling.cpp
@@ -647,7 +647,7 @@
   for (auto I : ForkAndExecs) {
     IRBuilder<> Builder(I);
     FunctionType *FTy = FunctionType::get(Builder.getVoidTy(), {}, false);
-    FunctionCallee GCOVFlush = M->getOrInsertFunction("__gcov_flush", FTy);
+    FunctionCallee GCOVFlush = M->getOrInsertFunction("__custom_llvm_gcov_flush", FTy);
     Builder.CreateCall(GCOVFlush);
     I->getParent()->splitBasicBlock(I);
   }
diff --git a/clang/lib/Driver/ToolChains/Darwin.cpp b/clang/lib/Driver/ToolChains/Darwin.cpp
index e113f9a679..b3a07b18c0 100644
--- a/clang/lib/Driver/ToolChains/Darwin.cpp
+++ b/clang/lib/Driver/ToolChains/Darwin.cpp
@@ -1122,7 +1122,7 @@
   // runtime's functionality.
   if (hasExportSymbolDirective(Args)) {
     if (needsGCovInstrumentation(Args)) {
-      addExportedSymbol(CmdArgs, "___gcov_flush");
+      addExportedSymbol(CmdArgs, "___custom_llvm_gcov_flush");
       addExportedSymbol(CmdArgs, "_flush_fn_list");
       addExportedSymbol(CmdArgs, "_writeout_fn_list");
     } else {