vendor/clang/clang-trunk-r338536

1 files changed, 17 insertions, 2 deletions

diff --git a/lib/CodeGen/CGOpenMPRuntime.cpp b/lib/CodeGen/CGOpenMPRuntime.cpp
index 3730b9af12fab..fa850155df4f9 100644
--- a/lib/CodeGen/CGOpenMPRuntime.cpp
+++ b/lib/CodeGen/CGOpenMPRuntime.cpp
@@ -3750,11 +3750,13 @@ CGOpenMPRuntime::createOffloadingBinaryDescriptorRegistration() {
     StringRef T = Device.getTriple();
     std::string BeginName = getName({"omp_offloading", "img_start", ""});
     auto *ImgBegin = new llvm::GlobalVariable(
-        M, CGM.Int8Ty, /*isConstant=*/true, llvm::GlobalValue::ExternalLinkage,
+        M, CGM.Int8Ty, /*isConstant=*/true,
+        llvm::GlobalValue::ExternalWeakLinkage,
         /*Initializer=*/nullptr, Twine(BeginName).concat(T));
     std::string EndName = getName({"omp_offloading", "img_end", ""});
     auto *ImgEnd = new llvm::GlobalVariable(
-        M, CGM.Int8Ty, /*isConstant=*/true, llvm::GlobalValue::ExternalLinkage,
+        M, CGM.Int8Ty, /*isConstant=*/true,
+        llvm::GlobalValue::ExternalWeakLinkage,
         /*Initializer=*/nullptr, Twine(EndName).concat(T));
 
     llvm::Constant *Data[] = {ImgBegin, ImgEnd, HostEntriesBegin,
@@ -8109,6 +8111,19 @@ void CGOpenMPRuntime::registerTargetGlobalVariable(const VarDecl *VD,
       VarName = CGM.getMangledName(VD);
       VarSize = CGM.getContext().getTypeSizeInChars(VD->getType());
       Linkage = CGM.getLLVMLinkageVarDefinition(VD, /*IsConstant=*/false);
+      // Temp solution to prevent optimizations of the internal variables.
+      if (CGM.getLangOpts().OpenMPIsDevice && !VD->isExternallyVisible()) {
+        std::string RefName = getName({VarName, "ref"});
+        if (!CGM.GetGlobalValue(RefName)) {
+          llvm::Constant *AddrRef =
+              getOrCreateInternalVariable(Addr->getType(), RefName);
+          auto *GVAddrRef = cast<llvm::GlobalVariable>(AddrRef);
+          GVAddrRef->setConstant(/*Val=*/true);
+          GVAddrRef->setLinkage(llvm::GlobalValue::InternalLinkage);
+          GVAddrRef->setInitializer(Addr);
+          CGM.addCompilerUsedGlobal(GVAddrRef);
+        }
+      }
       break;
     case OMPDeclareTargetDeclAttr::MT_Link:
       Flags = OffloadEntriesInfoManagerTy::OMPTargetGlobalVarEntryLink;