Re: errno bug?

[E. Robert Tisdale]

Thomas Maeder wrote:

> E. Robert Tisdale writes:
>
>
> >         > cat main.cc
> >         #include <stdio.h>
> >         #include <errno.h>
> >
> >         extern int errno;
>
>
> This is indeed an errno bug, but in your code :-)
>
> There is no requirement that errno be declared as an int variable by the C++
> implementation. I'm not even sure if defining errno as an int variable is
> conforming. Usually, it's a macro.

This has nothing to do with standards.
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.