You're right. I goofed.
> One way to fix it is to remove
>
> extern char a;
>
> and put
>
> extern int a;
>
> in a header file which is included by everyone.
>
Yup. Problem is, we have about 1500 instances in the kernel :(
(Wouldn't it be nice if `int a;' generated a compiler error
if a declaration `extern int a;' was not in scope?)
Oh well. Seems that disabling -fno-common and enabling
--warn-common is the only way to autodetect bugs such as this.
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