Relax __attribute_((nonnull)) checking to allow the attribute on functions with no pointer arguments. GCC doesn't warn

in this case, and the attribute is trivially satisfied (and benign).  Fixes <rdar://problem/8364828>.

llvm-svn: 113464

3 files changed, 5 insertions, 8 deletions

diff --git a/clang/include/clang/Basic/DiagnosticSemaKinds.td b/clang/include/clang/Basic/DiagnosticSemaKinds.td
index 91b0b6aae25..849c5c477c9 100644
--- a/clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -1016,14 +1016,11 @@ def err_mode_wrong_type : Error<
   "type of machine mode does not match type of base type">;
 def err_attr_wrong_decl : Error<
   "'%0' attribute invalid on this declaration, requires typedef or value">;
-def warn_attribute_nonnull_no_pointers : Warning<
-  "'nonnull' attribute applied to function with no pointer arguments">;
 def warn_attribute_malloc_pointer_only : Warning<
   "'malloc' attribute only applies to functions returning a pointer type">;
 def warn_transparent_union_nonpointer : Warning<
   "'transparent_union' attribute support incomplete; only supported for "
   "pointer unions">;
-
 def warn_attribute_sentinel_named_arguments : Warning<
   "'sentinel' attribute requires named arguments">;
 def warn_attribute_sentinel_not_variadic : Warning<
diff --git a/clang/lib/Sema/SemaDeclAttr.cpp b/clang/lib/Sema/SemaDeclAttr.cpp
index 25af73ae13d..a47d84fa35c 100644
--- a/clang/lib/Sema/SemaDeclAttr.cpp
+++ b/clang/lib/Sema/SemaDeclAttr.cpp
@@ -373,10 +373,10 @@ static void HandleNonNullAttr(Decl *d, const AttributeList &Attr, Sema &S) {
         NonNullArgs.push_back(I);
     }
 
-    if (NonNullArgs.empty()) {
-      S.Diag(Attr.getLoc(), diag::warn_attribute_nonnull_no_pointers);
+    // No pointer arguments?  The attribute in this case is
+    // trivially satisfied.
+    if (NonNullArgs.empty())
       return;
-    }
   }
 
   unsigned* start = &NonNullArgs[0];
diff --git a/clang/test/SemaObjC/nonnull.m b/clang/test/SemaObjC/nonnull.m
index 15fee74a3b5..282fd21a140 100644
--- a/clang/test/SemaObjC/nonnull.m
+++ b/clang/test/SemaObjC/nonnull.m
@@ -2,7 +2,7 @@
 
 @class NSObject;
 
-int f1(int x) __attribute__((nonnull)); // expected-warning{{'nonnull' attribute applied to function with no pointer arguments}}
+int f1(int x) __attribute__((nonnull)); //no-warning
 int f2(int *x) __attribute__ ((nonnull (1)));
 int f3(int *x) __attribute__ ((nonnull (0))); // expected-error {{'nonnull' attribute parameter 1 is out of bounds}}
 int f4(int *x, int *y) __attribute__ ((nonnull (1,2)));
@@ -44,4 +44,4 @@ foo (int i1, int i2, int i3, void (^cp1)(), void (^cp2)(), void (^cp3)())
   func7((NSObject*) 0); // no-warning
 }
 
-void func5(int) __attribute__((nonnull)); // expected-warning{{'nonnull' attribute applied to function with no pointer arguments}}
+void func5(int) __attribute__((nonnull)); // no-warning