[alsa-devel] usr/include/linux/soundcard.h warnings for 'make headers_check'

[Takashi Iwai]

At Wed, 04 Feb 2009 09:34:12 +0530,
Jaswinder Singh Rajput wrote:
> 
> On Tue, 2009-02-03 at 21:27 +0100, Arnd Bergmann wrote:
> > On Wednesday 21 January 2009, Sam Ravnborg wrote:
> > > 
> > > > No, these are declarations for OSS-lib.
> > > > It doesn't belong to kernel, but it's better to keep it for
> > > > compatibility in some way.
> > > 
> > > But not in the kernel for sure.
> > > I just checked and for example: OSS_init is not used anywhere in the kernel.
> > > The kernel headers are not a "dump all your stuff" ground anymore.
> > > 
> > > So I encourage you to find a better home for the user space library definitons.
> > > We can let the definiton stay for a while - but eventually they have to
> > > be dropped from the kernel.
> > 
> > The last free version of OSSlib that matches this header is from ~1997, and
> > no current distro appears to be shipping it. All new OSSlib versions (the
> > oldest I found was from ~2003) contain in their documentation:
> > 
> > "Older versions of some OSS include files are distributed
> >  with various operating systems. There is no danger in
> >  using them but applications written for more recent OSS
> >  versions will not compile with older header files.
> > 
> >  The latest versions of these include files (such as
> >  soundcard.h) are distributed in ../include/sys. Use
> >  the -I/usr/lib/oss/include switch when compiling
> >  programs. Alternatively copy these files to /usr/include/sys
> >  so that they replace the original ones."
> > 
> > I think it's safe enough to assume that everyone that builds against
> > OSSlib by now also has the correct version of the header installed.
> > Consequently, we should just drop the #ifndef __KERNEL__ section
> > of soundcard.h (all the macros in there depend on the extern
> > declarations), and maybe add an
> > 
> > #ifdef OSSLIB
> > #error need to use <sys/soundcard.h> from libOSSlib
> > #endif
> > 
> 
> sys/soundcard.h is also pointing to linux/soundcard.h, we need to move
> all this stuff to sys/soundcard.h.

All which stuff?
If you are referring to OSS-lib stuff in soundcard.h, then I'm for
it.

Also giving an error with an ifdef OSSLIB like Arnd suggested would be
nice, too.  But maybe we need one more ifdef such as

#ifdef OSSLIB
#ifndef _SYS_SOUNDCARD_H
#error ...
#endif
#endif


thanks,

Takashi