[gcov/Darwin] Ensure external symbols are exported when using an export list

Make sure that symbols needed to implement runtime support for gcov are
exported when using an export list on Darwin.

Without the clang driver exporting these symbols, the linker hides them,
resulting in tapi verification failures.

rdar://45944768

Differential Revision: https://reviews.llvm.org/D55151

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@348187 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 10 insertions, 4 deletions

diff --git a/lib/Driver/ToolChains/Darwin.cpp b/lib/Driver/ToolChains/Darwin.cpp
index 50c0db5b5a..452b6b89ca 100644
--- a/lib/Driver/ToolChains/Darwin.cpp
+++ b/lib/Driver/ToolChains/Darwin.cpp
@@ -1034,11 +1034,17 @@ void Darwin::addProfileRTLibs(const ArgList &Args,
   // runtime, automatically export symbols necessary to implement some of the
   // runtime's functionality.
   if (hasExportSymbolDirective(Args)) {
-    addExportedSymbol(CmdArgs, "___llvm_profile_filename");
-    addExportedSymbol(CmdArgs, "___llvm_profile_raw_version");
-    addExportedSymbol(CmdArgs, "_lprofCurFilename");
+    if (needsGCovInstrumentation(Args)) {
+      addExportedSymbol(CmdArgs, "___gcov_flush");
+      addExportedSymbol(CmdArgs, "_flush_fn_list");
+      addExportedSymbol(CmdArgs, "_writeout_fn_list");
+    } else {
+      addExportedSymbol(CmdArgs, "___llvm_profile_filename");
+      addExportedSymbol(CmdArgs, "___llvm_profile_raw_version");
+      addExportedSymbol(CmdArgs, "_lprofCurFilename");
+      addExportedSymbol(CmdArgs, "_lprofMergeValueProfData");
+    }
     addExportedSymbol(CmdArgs, "_lprofDirMode");
-    addExportedSymbol(CmdArgs, "_lprofMergeValueProfData");
   }
 }