Re: ld.so and "the FAQ"

[Matthew Palmer <mpalmer@debian.org>]

On Tue, Nov 11, 2003 at 06:12:14AM -0800, Jeff Bailey wrote:
> You probably want this FAQ entry:

Which, I've been informed, is in fact in README.Debian.gz.

> * errno: If a program uses the variable "errno", then it _must_
>   include <errno.h>.  The old libc often (erroneously) declared this
>   variable implicitly as a side-effect of including other libc header
>   files.  glibc is careful to avoid such namespace pollution, which,
>   in turn, means that you really need to include the header files that
>   you depend on.  This difference normally manifests itself in the
>   form of the compiler complaining about references to an undeclared
>   symbol "errno".
>  
> Applications that reference errno without including <errno.h> (usually
> by doing ``unsigned int errno'') now generate a runtime warning. 
> Shortly after Sarge releases, they will all break, and there will be a
> mass bug-filing.  For some reason it looks like either evo or cyrus are
> triggering this bug, and it's getting displayed to the imap reader.

Yeah, there was another bug against cyrus for this, with patch, but I didn't
make any sort of connection.  Good to know I've just whacked three bugs for
the price of one... <grin>

Thanks for digging that up.

- Matt