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Date: Thu, 6 Aug 2009 14:59:25 +0200
From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: sysmacros.h
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On Aug  6 14:40, Csaba Raduly wrote:
> Corinna Vinschen wrote:
> > Same as on Linux.
> 
> Yes, but on Linux, sysmacros.h contains more than just minor, major and makedev.
> 
> 
> Also, on the Linuxes I checked (RHEL 4, Ubuntu 8.10, SLES 10.2, SUSE
> 10.0, SLES 9), it is guarded by a #ifdef:
> 
> #ifdef  __USE_BSD
> /* In BSD <sys/types.h> is expected to define BYTE_ORDER.  */
> # include <endian.h>
> 
> /* It also defines `fd_set' and the FD_* macros for `select'.  */
> # include <sys/select.h>
> 
> /* BSD defines these symbols, so we follow.  */
> # include <sys/sysmacros.h>
> #endif /* Use BSD.  */
> 
> 
> __USE_BSD is defined only if _BSD_SOURCE is defined. Perhaps Cygwin
> could follow suit here too.

__USE_BSD is defined by default when compiling applications on Linux.
Cygwin/newlib does not have the complex system of defines which differ
between BSD/SYSV/POSIX/GNU/C89/C99/etc and allow to include and exclude
symbols based on that.  The newlib system is much less elaborate.  We
simply lack the volunteering manpower Linux and glibc have.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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