Re: errno bug?

[E. Robert Tisdale]

Thomas Maeder wrote:

> "E. Robert Tisdale" <E.Robert.Tisdale@jpl.nasa.gov> writes:
>
>
> > The problem is that /usr/include/bits/errno.h declares:
> >
> > extern int *__errno_location (void) __THROW __attribute__ ((__const__));
> >
> > but defines the C preprocessor macro:
> >
> > #   define errno (*__errno_location ())
> >
> >
> > The declaration and the macro definition are inconsistent.
>
>
> I don't see it.
>
> __errno_location() evaluates to an int *, so (*__errno_location ())
> evaluates to an lvalue of type int. Makes sense to me.
>
> Is there a problem with the "__THROW __attribute__ ((__const__));" part
> (which I don't understand)?

Evidently, it resolves to 'throw()' when compiled with g++ but

        extern int errno;

is replaced with

        extern int (*__errno_location ());