XCore target: add section information.

Xcore target ABI requires const data that is externally visible
to be handled differently if it has C-language linkage rather than
C++ language linkage.

llvm-svn: 201142

clang/lib/CodeGen/CodeGenModule.cpp

@@ -1578,6 +1578,12 @@ CodeGenModule::GetOrCreateLLVMGlobal(StringRef MangledName,
   if (AddrSpace != Ty->getAddressSpace())
     return llvm::ConstantExpr::getAddrSpaceCast(GV, Ty);
 
+  if (getTarget().getTriple().getArch() == llvm::Triple::xcore &&
+      D->getLanguageLinkage() == CLanguageLinkage &&
+      D->getType().isConstant(Context) &&
+      isExternallyVisible(D->getLinkageAndVisibility().getLinkage()))
+    GV->setSection(".cp.rodata");
+
   return GV;
 }
 

clang/test/CodeGen/xcore-abi.c

@@ -10,8 +10,13 @@ _Static_assert(_Alignof(double) == 4, "alignof double is wrong");
 
 // CHECK: target triple = "xcore-unknown-unknown"
 
+// CHECK: @cgx = external constant i32, section ".cp.rodata"
+extern const int cgx;
+int fcgx() { return cgx;}
 // CHECK: @g1 = global i32 0, align 4
 int g1;
+// CHECK: @cg1 = constant i32 0, section ".cp.rodata", align 4
+const int cg1;
 
 #include <stdarg.h>
 struct x { int a[5]; };