Path: utzoo!attcan!uunet!wuarchive!usc!ucsd!ucbvax!BRL.MIL!moss
From: moss@BRL.MIL ("Gary S. Moss", VLD/VMB)
Newsgroups: comp.sys.sgi
Subject: Re:  comparing pointers to void functions
Message-ID: <9005301007.aa09801@VMB.BRL.MIL>
Date: 30 May 90 14:07:06 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 16

< 	if (thing->formstart == bgnpolygon)
< The compiler says "operands of == have incompatible types".

Chris,
	I ran into this exact problem yesterday.  It looks like a compiler
bug; I tried just about everything comparing a pointer to a function of
type void to the function name with the same result.  Casting each side
to a generic pointer type shuts up the compiler, but this is a non-portable
workaround since there is no guarantee in ANSI C that a function pointer
will fit in a generic *object* pointer type:

#ifdef mips
	if( (void *) thing->formstart == (void *) bgnpolygon )
#endif

	Anyone at SGI want to wedge  a fix in to the next release?