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From: brad@ds3.bradley.edu (Bradley E. Smith)
Newsgroups: comp.sys.sun
Subject: Union Problem on Sparc
Keywords: Miscellaneous
Message-ID: <1990Nov4.031554.3208@rice.edu>
Date: 4 Nov 90 03:00:00 GMT
Sender: sun-spots-request@rice.edu
Organization: Sun-Spots
Lines: 36
Approved: Sun-Spots@rice.edu
Originator: spots@titan.rice.edu
X-Sun-Spots-Digest: Volume 9, Issue 358, message 19
X-Original-Date: Wed, 17 Oct 90 21:51:28 GMT

Hi, I realize that the program below is not quite right(or proper) but I
am trying to move our 'pic' source from a VAX to a SUN SPARC.  The below
program works ok on a VAX, AT&T 3B2, IBM RT but dumps core on a SUN.  I
always thought that unions were passed by value.  Anyways I need this
program to work, or I will have to rewrite a bunch of things.

Is it me or is the compiler bugging (FYI: 4.0.3 and 4.1 have the same
problem, and gcc does the same thing).

union u {
	int i;
	long l;
	char c;
	float f;
	char *cp;
};


main()
{
	union u x,z;

	x.i = 100;
	z.i = 99;
	printf("sizeof(u) = %d\n", sizeof(x));
	printf("sizeof(int) = %d\n", sizeof(int));
	(void) doit(x,z);
	(void) doit(0,0);
	exit(0);
}
doit(a,b)
union u a;
union u b;
{
	(void) printf("%d, %d\n", a.i, b.i);
}