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Re: 1.7: gcc 3.4.4 optimization bug ?


Den 2009-12-26 18:45 skrev Kiran Prakash:
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_";

You need strcpy(tmp, "\\Device\\NPF_") instead of the assignment.


    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_";

Ditto.


    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.

Nope.


Also, is gcc 3.4.4 supported on cygwin 1.7 at all ?

Don't know.


Cheers,
Peter


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