[Bug c/12543] New: ISO C requires whitespace after the mac

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12543

           Summary: ISO C requires whitespace after the mac
           Product: gcc
           Version: 3.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: sfm_9 at yahoo dot com
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: ISO C requires whitespace after the mac
  GCC host triplet: ISO C requires whitespace after the mac
GCC target triplet: ISO C requires whitespace after the mac

I have this code,
OS: red hat linux 8. kernel version:2.4.18-14
gcc version: 3.2

#include <stdio.h>
#define CONST=10
#define max (a,b) (((a) > (b)) ? (a): (b))

main()
{
   int i;

   i = max (20, CONST);

   printf("El mayor de %d y %d es %d\n", 20, CONST, i);
}

I compiled with:
gcc prep1.c -E -o prep1.i
prep1.c:2:14: warning: ISO C requires whitespace after the macro name

an afer with:
gcc prep1.c -o prep1
prep1.c:2:14: warning: ISO C requires whitespace after the macro name
prep1.c: In function `main':
prep1.c:9: `a' undeclared (first use in this function)
prep1.c:9: (Each undeclared identifier is reported only once
prep1.c:9: for each function it appears in.)
prep1.c:9: `b' undeclared (first use in this function)
prep1.c:9: parse error before '=' token
prep1.c:11: parse error before '=' token

i dont know why gave that errors..