macro with the same name in translation unit

From	"Mark" <mark_cruzNOTFORSPAM@hotmail.com>
Newsgroups	comp.lang.c
Subject	macro with the same name in translation unit
Date	2011-09-28 10:53 -0400
Organization	Aioe.org NNTP Server
Message-ID	<j5vce0$4sa$1@speranza.aioe.org> (permalink)

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Hi,

consider the snippet:

#include <stdio.h>

#define DUMMY 100
#define FOO 200
#define DUMMY 200

int main (void)
{
    printf("%d, %d\n",FOO, DUMMY);
    return 0;
}

The compiler I'm using (gcc-4.1.2) emits warning message about redefined 
macro, but picks up and prints the last defined, i.e. with value 200. Is 
this platform dependent behavior, or undefined behavior?

Thanks.

Mark

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macro with the same name in translation unit "Mark" <mark_cruzNOTFORSPAM@hotmail.com> - 2011-09-28 10:53 -0400
  Re: macro with the same name in translation unit James Kuyper <jameskuyper@verizon.net> - 2011-09-28 11:41 -0400
    Re: macro with the same name in translation unit Keith Thompson <kst-u@mib.org> - 2011-09-28 09:22 -0700
      Re: macro with the same name in translation unit James Kuyper <jameskuyper@verizon.net> - 2011-09-28 13:16 -0400
        Re: macro with the same name in translation unit Keith Thompson <kst-u@mib.org> - 2011-09-28 13:42 -0700
          Re: macro with the same name in translation unit James Kuyper <jameskuyper@verizon.net> - 2011-09-28 17:18 -0400

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