Re: Compiling daemontools

> Yes. That is a obsolete method to link in errno.  Multithreaded systems
> need errno to be thread-specific, and so the interface to errno was
> changed some time ago. There isn't an extern int errno anymore. The
> anachronism 'extern errno' shouldn't link on any system, and doesn't on
> most systems.  But its a common thing found in older code.

 http://cr.yp.to/docs/unixport.html#errno

 Single Unix v3 states that #include <errno.h> is the right way to
declare errno, so future software should indeed conform to that, but
still, maintaining "extern int errno" compatibility for single-threaded
programs wasn't hard and breaking it forcefully is a debatable design
decision from the glibc maintainers.

 (If only that was their only debatable design decision. :))

-- 
 Laurent