[Python-Dev] test_itertools fails for trunk on x86 OS X machine

[Jack Diederich]

On Thu, Sep 21, 2006 at 10:23:54PM -0700, Neal Norwitz wrote:
> On 9/21/06, Jack Diederich <jackdied at jackdied.com> wrote:
> >
> > I should leave the tounge-in-cheek bombast to Tim and Frederik, especially
> > when dealing with what might be an OS & machine specific bug.  The next
> > checkin and re-test will or won't highlight a failure and certainly someone
> > with a g4 will try it out before 2.5.1 goes out so we'll know if it was a
> > fluke soonish. The original error was mine, I typed "Size_t" instead of
> > "Ssize_t" and while my one-char patch might also be wrong (I hope not, I'm
> > red-faced enough as is) we should find out soon enough.
> 
> It looks like %zd of a negative number is treated as an unsigned
> number on OS X, even though the man page says it should be signed.
> 
> """
> The z modifier, when applied to a d or i conversion, indicates that
> the argument is of a signed type equivalent in size to a size_t.
> """
> 
> The program below returns -123 on Linux and 4294967173 on OS X.
> 
> n
> --
> #include <stdio.h>
> int main()
> {
>     char buffer[256];
>       if(sprintf(buffer, "%zd", (size_t)-123) < 0)
>         return 1;
>      printf("%s\n", buffer);
>      return 0;
> }

Consider me blushing even harder for denying the power of the buildbot
(and against all evidence).  Yikes, didn't any other tests trigger this?

sprat:~/src/python-head# find ./ -name '*.c' | xargs grep '%zd' | wc -l
65

-Jack