Downgrade error about nonnull attribute bbeing applied to a function without point arguments to a warning

llvm-svn: 110939

clang/include/clang/Basic/DiagnosticSemaKinds.td

@@ -845,7 +845,7 @@ def err_attribute_argument_out_of_bounds : Error<
   "'%0' attribute parameter %1 is out of bounds">;
 def err_attribute_requires_objc_interface : Error<
   "attribute may only be applied to an Objective-C interface">;
-def err_nonnull_pointers_only : Error<
+def warn_nonnull_pointers_only : Warning<
   "nonnull attribute only applies to pointer arguments">;
 def err_ownership_type : Error<
   "%0 attribute only applies to %1 arguments">;

clang/lib/Sema/SemaDeclAttr.cpp

@@ -321,7 +321,7 @@ static void HandleNonNullAttr(Decl *d, const AttributeList &Attr, Sema &S) {
     QualType T = getFunctionOrMethodArgType(d, x);
     if (!T->isAnyPointerType() && !T->isBlockPointerType()) {
       // FIXME: Should also highlight argument in decl.
-      S.Diag(Attr.getLoc(), diag::err_nonnull_pointers_only)
+      S.Diag(Attr.getLoc(), diag::warn_nonnull_pointers_only)
         << "nonnull" << Ex->getSourceRange();
       continue;
     }

clang/test/SemaObjC/nonnull.m

@@ -43,3 +43,5 @@ foo (int i1, int i2, int i3, void (^cp1)(), void (^cp2)(), void (^cp3)())
   func6((NSObject*) 0); // no-warning
   func7((NSObject*) 0); // no-warning
 }
+
+void func5(int) __attribute__((nonnull)); // expected-warning{{'nonnull' attribute applied to function with no pointer arguments}}