const _Atomic(T) is not an atomic type, so do not allow it as the type 'A' in

C11 7.17's atomic operations. GNU's __atomic_* builtins do allow const-qualified
atomics, though (!!) so don't restrict those.

llvm-svn: 163964

1 files changed, 5 insertions, 1 deletions

diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp
index 0e6b5ec9a39..6d8d7f2c044 100644
--- a/clang/lib/Sema/SemaChecking.cpp
+++ b/clang/lib/Sema/SemaChecking.cpp
@@ -742,6 +742,11 @@ ExprResult Sema::SemaAtomicOpsOverloaded(ExprResult TheCallResult,
         << Ptr->getType() << Ptr->getSourceRange();
       return ExprError();
     }
+    if (AtomTy.isConstQualified()) {
+      Diag(DRE->getLocStart(), diag::err_atomic_op_needs_non_const_atomic)
+        << Ptr->getType() << Ptr->getSourceRange();
+      return ExprError();
+    }
     ValType = AtomTy->getAs<AtomicType>()->getValueType();
   }
 
@@ -6124,4 +6129,3 @@ void Sema::CheckArgumentWithTypeTag(const ArgumentWithTypeTagAttr *Attr,
         << ArgumentExpr->getSourceRange()
         << TypeTagExpr->getSourceRange();
 }
-