Patch to support transparent_union types on

objective-c methods. Fixes radar 7875968.

llvm-svn: 101935

clang/lib/Sema/SemaExprObjC.cpp

@@ -216,6 +216,11 @@ bool Sema::CheckMessageArgumentTypes(Expr **Args, unsigned NumArgs,
 
     AssignConvertType Result =
       CheckSingleAssignmentConstraints(lhsType, argExpr);
+    if (Result == Incompatible && !getLangOptions().CPlusPlus &&
+        CheckTransparentUnionArgumentConstraints(lhsType, argExpr)
+        == Sema::Compatible)
+      Result = Compatible;
+        
     if (Args[i] != argExpr) // The expression was converted.
       Args[i] = argExpr; // Make sure we store the converted expression.
 

clang/test/SemaObjC/transparent-union.m

@@ -0,0 +1,22 @@
+// RUN: %clang_cc1  -fsyntax-only -verify %s
+
+typedef union {
+ struct xx_object_s *_do;
+ struct xx_continuation_s *_dc;
+ struct xx_queue_s *_dq;
+ struct xx_queue_attr_s *_dqa;
+ struct xx_group_s *_dg;
+ struct xx_source_s *_ds;
+ struct xx_source_attr_s *_dsa;
+ struct xx_semaphore_s *_dsema;
+} xx_object_t __attribute__((transparent_union));
+
+@interface INTF
+- (void) doSomething : (xx_object_t) xxObject;
+- (void)testMeth;
+@end
+
+@implementation INTF
+- (void) doSomething : (xx_object_t) xxObject {}
+- (void)testMeth { struct xx_queue_s *sq; [self doSomething:sq ]; }
+@end