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From: ksb@mentor.cc.purdue.edu (Kevin Braunsdorf)
Newsgroups: alt.hackers
Subject: cc hack to check if we get a string on an int in a -Ddefine
Keywords: cc, hack, -D, run-time
Message-ID: <4537@mentor.cc.purdue.edu>
Date: 25 Jan 91 21:59:02 GMT
Reply-To: ksb@mentor.cc.purdue.edu (Kevin Braunsdorf)
Organization: <no credit to Purdue's good name here>
Lines: 31
Approved: news@cc.purdue.edu


I wanted to let a configure script give me a service name or a port
number, like:
	cc -DPORT=\"junk\" server.c

or
	cc -DPORT=2189 server.c

But I needed to be able to check in the C code to see which one I got:


/* $Compile(1): cc -DPORT=\"123\" %f
 * $Compile(1): cc -DPORT=123 %f
 */
main()
{
	static char a[] = { PORT };

	if (1 != sizeof(a) || sizeof(PORT) != sizeof(PORT+1)) {
		printf("string %s\n", a);
	} else {
		printf("int %d\n", PORT);
	}

	exit(0);
}


--
If you're not part of the solution, you're part of the problem.
kayessbee, Kevin Braunsdorf, ksb@cc.purdue.edu, pur-ee!ksb, purdue!ksb