1.7: gcc 3.4.4 optimization bug ?

Sat Dec 26 17:46:00 GMT 2009

Hi,
I just recently ugraded to cygwin 1.7
I was modifying iftop to work on cygwin, when I ran into this little bug.
I'm generally not so quick to blame the compiler, but I can't find any
other explanation.
char *tmp, options.interface;
The following works.
   if (options.interface[0]=='{')
     {
 tmp=xmalloc( 32+strlen(options.interface) );
    tmp="\\Device\\NPF_";
    strcat(tmp, options.interface);
    xfree(options.interface);
    options.interface=tmp;
     }
   fprintf(stderr, "opening interface:%s\n", options.interface);
This does not.
   if (options.interface[0]=='{')
     {
 tmp=xmalloc( 32+strlen(options.interface) );
    tmp="\\Device\\NPF_";
    strcat(tmp, options.interface);
    xfree(options.interface);
    options.interface=tmp;
     }
   fprintf(stderr, "opening interface:%s\n", tmp);
command line is gcc -g -O2 -L/usr/lib -o iftop.exe ....
Certainly looks like an optimization problem.
Also, is gcc 3.4.4 supported on cygwin 1.7 at all ?
Cheers,
Kiran
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