externs and thread local storage

[Gary Funck]

Pinski wrote: 
> What about the following two sources:
> char t;
> ---
> extern int t;
> What should happen? According to the C standard this is invalid code but
> the compiler does not need to diagnose the problem.

Yup.  Certainly a great way to re-use space across separately compiled
"C" source files (ala Fortran's blank common). <g>

I can see where the compiler is within its rights to issue
a warning above, or even a pedantic error.