Re: cvs commit: src/sys/sys errno.h

["Simon 'corecode' Schubert" <corecode@xxxxxxxxxxxx>]

Lately Jeroen Ruigrok/asmodai <asmodai@xxxxxxxxxxxxx> said:

> -On [20050702 20:14], Simon Schubert (corecode@xxxxxxxxxxxxxxxxxxxxxxx) wrote:
> >  Lots of third party programs declare
> >  extern int errno;
> >  
> >  This breaks when errno is declared as
> >  extern __thread int errno;
> This change is bogus and I ask you to reverse it.
> 
> Read up on:
> http://standards.ieee.org/reading/ieee/interp/1003-1-90_int/pasc-1003.1-54.html

then we were broken since ever, because

	__thread extern int errno
is different from
	extern int errno

could you please elaborate on the bogusness and the proper fix
regarding the fact that we need to support

a) threaded implementation
b) programs that
	#include <errno.h>
and erroneously do
	extern int errno;
as therere are more than a dozen *major* programs out there doing this
(perl, ruby, maybe python, just to mention some)
c) best ABI compatibility to -Devel

cheers
  simon

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