Patch to issue error when target of MacOS and iOS

does not support large load/store of atomic objects.
// rdar://13973577

llvm-svn: 182781

1 files changed, 11 insertions, 3 deletions

diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp
index cdc546c4761..da24667804b 100644
--- a/clang/lib/Sema/SemaChecking.cpp
+++ b/clang/lib/Sema/SemaChecking.cpp
@@ -908,10 +908,18 @@ ExprResult Sema::SemaAtomicOpsOverloaded(ExprResult TheCallResult,
     SubExprs.push_back(TheCall->getArg(3)); // Weak
     break;
   }
+  
+  AtomicExpr *AE = new (Context) AtomicExpr(TheCall->getCallee()->getLocStart(),
+                                            SubExprs, ResultType, Op,
+                                            TheCall->getRParenLoc());
+  
+  if ((Op == AtomicExpr::AO__c11_atomic_load ||
+       (Op == AtomicExpr::AO__c11_atomic_store)) &&
+      Context.AtomicUsesUnsupportedLibcall(AE))
+    Diag(AE->getLocStart(), diag::err_atomic_load_store_uses_lib) <<
+    ((Op == AtomicExpr::AO__c11_atomic_load) ? 0 : 1);
 
-  return Owned(new (Context) AtomicExpr(TheCall->getCallee()->getLocStart(),
-                                        SubExprs, ResultType, Op,
-                                        TheCall->getRParenLoc()));
+  return Owned(AE);
 }