GNU compiler bug?

[akarpov at my-deja dot com]

Hello VxWorkers!

I’m  extremely puzzled by a bug I've discovered in the GNU compiler. It
can be reproduced by this simple example of code:

/** begin of the example (gnu_bug.c) **/
#include <stdlib.h>
#include <string.h>
void myfunc(char*s, int *x)
{  char *loc;

   loc=malloc(246);
   strcpy(loc,"11111");
   free(s);		/*    pushl %ebx           */
			/*    call 0x11bf70 <free> */
    s= loc;		/**** NO CODE GENERATED ! ***/
   *x= 246;		/*    movl $0xf6, (%esi)   */

}
void main(void)
{
char *str; int y;
str=malloc(246);
strcpy(str,"sdfsd");
myfunc(str,&y);
}
/** end of the example  (gnu_bug.c) **/

The problem is that no code is generated for the source line “s=loc;”
in the myfunc() !
This is also what I saw in the disassembled code.
Here I brought the compilation options on my x86 BSP:

cc386 -O -fvolatile -nostdlib -fno-builtin -fno-defer-pop -m486 -Wall -
I/h   -I. -IC:\Tornado\target\config\all -IC:\Tornado\target/h -
IC:\Tornado\target/src/config -IC:\Tornado\target/src/drv -ansi -
nostdinc -DCPU=I80486   -Wp,-lang-c++ -o gnu_bug.o -g -Winline -c gnu_
bug.c

Any thoughts guys?

Thanks,
Alex

- VxWorks -


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