Revert r320464 as it breaks gold plugin tests

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@320467 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Transforms/IPO/FunctionImport.cpp b/lib/Transforms/IPO/FunctionImport.cpp
index 043a046..3a1d6de 100644 (file)
--- a/lib/Transforms/IPO/FunctionImport.cpp
+++ b/lib/Transforms/IPO/FunctionImport.cpp
@@ -642,9 +642,23 @@ void llvm::thinLTOResolveWeakForLinkerModule(
 /// Run internalization on \p TheModule based on symmary analysis.
 void llvm::thinLTOInternalizeModule(Module &TheModule,
                                     const GVSummaryMapTy &DefinedGlobals) {
+  // Parse inline ASM and collect the list of symbols that are not defined in
+  // the current module.
+  StringSet<> AsmUndefinedRefs;
+  ModuleSymbolTable::CollectAsmSymbols(
+      TheModule,
+      [&AsmUndefinedRefs](StringRef Name, object::BasicSymbolRef::Flags Flags) {
+        if (Flags & object::BasicSymbolRef::SF_Undefined)
+          AsmUndefinedRefs.insert(Name);
+      });
+
   // Declare a callback for the internalize pass that will ask for every
   // candidate GlobalValue if it can be internalized or not.
   auto MustPreserveGV = [&](const GlobalValue &GV) -> bool {
+    // Can't be internalized if referenced in inline asm.
+    if (AsmUndefinedRefs.count(GV.getName()))
+      return true;
+
     // Lookup the linkage recorded in the summaries during global analysis.
     auto GS = DefinedGlobals.find(GV.getGUID());
     if (GS == DefinedGlobals.end()) {