CodeGen: Use PLT relocations for relative references to unnamed_addr functions.

The relative vtable ABI (PR26723) needs PLT relocations to refer to virtual
functions defined in other DSOs. The unnamed_addr attribute means that the
function's address is not significant, so we're allowed to substitute it
with the address of a PLT entry.

Also includes a bonus feature: addends for COFF image-relative references.

Differential Revision: http://reviews.llvm.org/D17938

llvm-svn: 267211

1 files changed, 4 insertions, 4 deletions

diff --git a/llvm/lib/Target/ARM/ARMTargetObjectFile.h b/llvm/lib/Target/ARM/ARMTargetObjectFile.h
index 98e8763c470..b1db201cb30 100644
--- a/llvm/lib/Target/ARM/ARMTargetObjectFile.h
+++ b/llvm/lib/Target/ARM/ARMTargetObjectFile.h
@@ -21,10 +21,10 @@ class ARMElfTargetObjectFile : public TargetLoweringObjectFileELF {
 protected:
   const MCSection *AttributesSection;
 public:
-  ARMElfTargetObjectFile() :
-    TargetLoweringObjectFileELF(),
-    AttributesSection(nullptr)
-  {}
+  ARMElfTargetObjectFile()
+      : TargetLoweringObjectFileELF(), AttributesSection(nullptr) {
+    PLTRelativeVariantKind = MCSymbolRefExpr::VK_ARM_PREL31;
+  }
 
   void Initialize(MCContext &Ctx, const TargetMachine &TM) override;