1 files changed, 47 insertions, 0 deletions
diff --git a/gcc/testsuite/objc.dg/method-conflict-4.m b/gcc/testsuite/objc.dg/method-conflict-4.m
new file mode 100644
index 000000000..a0c278294
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+++ b/gcc/testsuite/objc.dg/method-conflict-4.m
@@ -0,0 +1,47 @@
+/* Contributed by Nicola Pero <nicola.pero@meta-innovation.com>, December 2010.  */
+/* { dg-do compile } */
+
+#include <objc/objc.h>
+
+/* Test that the compiler can correctly compare protocols in types of
+   method signatures.  In this test we look at protocols implementing
+   other protocols.  The fact that one protocol implements another one
+   doesn't mean that they are identical.  */
+
+@protocol A
+- (void) doSomething;
+@end
+
+@protocol B <A>
+- (void) doSomethingElse;
+@end
+
+@protocol C <A>
+- (void) doYetSomethingElse;
+@end
+
+@interface MyClass2
+- (void) aMethod: (id <A>)x;  /* { dg-message "previous declaration" } */
+- (void) aMethod: (id <B>)x;  /* { dg-error "duplicate declaration" } */
+
+- (void) bMethod: (id <B>)x;  /* { dg-message "previous declaration" } */
+- (void) bMethod: (id <A>)x;  /* { dg-error "duplicate declaration" } */
+
+- (void) cMethod: (id <A, B>)x;
+- (void) cMethod: (id <B>)x;  /* Ok - because if you implement B, then you also implement A, so <B> == <A, B> */
+
+- (void) dMethod: (id <A, B>)x;
+- (void) dMethod: (id <B, A>)x; /* Ok */
+
+- (void) eMethod: (id <A>)x;  /* { dg-message "previous declaration" } */
+- (void) eMethod: (id <B, C>)x;  /* { dg-error "duplicate declaration" } */
+
+- (void) fMethod: (id <B, C>)x;  /* { dg-message "previous declaration" } */
+- (void) fMethod: (id <A>)x;  /* { dg-error "duplicate declaration" } */
+
+- (void) gMethod: (id <A>)x;  /* { dg-message "previous declaration" } */
+- (void) gMethod: (id <A, B, C>)x;  /* { dg-error "duplicate declaration" } */
+
+- (void) hMethod: (id <A, B, C>)x;  /* { dg-message "previous declaration" } */
+- (void) hMethod: (id <A>)x;  /* { dg-error "duplicate declaration" } */
+@end