egcs problem

["Lewis, James M. " <Jim.Lewis@alcoa.com>]

from gcc -v
gcc version egcs-2.91.66 Debian GNU/Linux (egcs-1.1.2 release)

toupper and tolower throw warnings (or not) depending on optimization.
Compiling the following test program with:
	cc -Wall -ansi -pedantic -c junk.c
will not give any errors.  However, adding -O causes ansi warnings:
	cc -O -Wall -ansi -pedantic -c junk.c

I expect to find these things in my code but not the system.  It's not
terribly important but it is irritating.  I can turn off -ansi and
-pedantic and it goes away but I loose the close checks.  Is this a
known problem?

jim


test prog...
/*
 * test toupper and tolower with -ansi, et.al.
 */

#define _POSIX_SOURCE 1
#include <ctype.h>


int  main (void)
{
   char c[] = "abc";

   *c = toupper (*c);
   *c = tolower (*c);
      
   return 0;
}