Patch to fix libobjc crash

[Richard Frith-Macdonald <richard at brainstorm dot co dot uk>]

If you compile the following test program using the command 'gcc test.m 
-lobjc'
Then run a.out, and you will get a segmentation violation.

This is because TestProtocol contains only a class method, but we tried 
to look
up an instance method ... the lookup should have returned a null 
pointer rather
than crashing.

Test program ...

#include        <objc/objc.h>
#include        <objc/Object.h>
#include        <objc/Protocol.h>

@protocol TestProtocol
+ testMethod;
@end

int
main()
{
  [@protocol(TestProtocol) descriptionForInstanceMethod: 
@selector(name)];
  return 0;
}




ChangeLog ...

2003-07-04	Richard Frith-Macdonald <richard@brainstorm.co.uk>

	* libobjc/Protocol.m: Avoid dereferencing null pointer in order to 
prevent
	crashes.  Fixes PR libobjc/11433

Attachment: Protocol.m.patch
Description: Binary data