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From: Vin Shelton <acs AT xemacs DOT org>
Subject:  New gcc-4 compile error w/getc and isspace
Date:  Sun, 08 Nov 2009 23:43:41 -0500
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Consider this module:

#include <stdio.h>
#include <ctype.h>

void
tst(FILE *fp)
{
   int c;

   while ( isspace(c = getc(fp)) )
     ;

   return;
}

gcc-4 -c t2.c
t2.c: In function ‘tst’:
t2.c:9: error: lvalue required as left operand of assignment

I'm pretty sure this module used to compile successfully under gcc-4, 
but I recently rebuilt my machine, so something may have changed in the 
configuration.

gcc-3 compiles the module without complaint.

gcc-4 will compile this version:

#include <stdio.h>
#include <ctype.h>

void
tst(FILE *fp)
{
   int c;

   //while ( isspace(c = getc(fp)) )
   while ( c = getc(fp) && isspace(c) )
     ;

   return;
}

Did something recently change in the ctype.h or stdio.h header files to 
cause this?

Regards,
   Vin


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