[gcc r11-3793] testsuite, Objective-C : Fix call-super-2.m for newer NeXT headers.

[Iain D Sandoe]

https://gcc.gnu.org/g:b292746ff7cfe708d3311ea41242c44ccbbe2693

commit r11-3793-gb292746ff7cfe708d3311ea41242c44ccbbe2693
Author: Iain Sandoe <iain@sandoe.co.uk>
Date:   Thu Oct 8 08:00:08 2020 +0100

    testsuite, Objective-C : Fix call-super-2.m for newer NeXT headers.
    
    We were using a callout to runtime.h which, eventually brings in the system
    runtime.h.  One newer versions of the Darwin/NeXT headers this declares the
    objc_getClass() function as returning Class, rather than the internal
    representation of that.  This breaks a fragile assumption in objc-act that
    the use of these internal functions can be deduced by looking at the function
    type.  Ultimately, the fragility should be fixed - but this fixes up the test
    so that it only uses the compiler's forward declaration of the function.
    
    gcc/testsuite/ChangeLog:
    
            * objc.dg/call-super-2.m: Remove inclusion of runtime.h.
            Add a FIXME about the test portability.

Diff:
---
 gcc/testsuite/objc.dg/call-super-2.m | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/gcc/testsuite/objc.dg/call-super-2.m b/gcc/testsuite/objc.dg/call-super-2.m
index 0a3765f07fb..836cad92126 100644
--- a/gcc/testsuite/objc.dg/call-super-2.m
+++ b/gcc/testsuite/objc.dg/call-super-2.m
@@ -3,7 +3,8 @@
 /* { dg-do compile } */
 
 #include "../objc-obj-c++-shared/TestsuiteObject.h"
-#include "../objc-obj-c++-shared/runtime.h"
+/* NOTE: we are relying on the built-in type for objc_getClass being used
+   rather than the one that might come from including <objc/runtime.h>.  */
 #include <stddef.h>
 
 /* FIXME: This is temporary.  At the moment, the compiler, when
@@ -14,6 +15,9 @@
 # define objc_getClass(C) objc_get_class(C)
 #endif
 
+/* FIXME: casting of super is not permitted by clang, so that many of the
+   tests here are testing non-portable code.  */
+
 @protocol Func
 + (int) class_func0;
 - (int) instance_func0;