[uml-devel] Re: [PATCH] uml: support a separate build tree; support USER_OBJS dependencies

["Vadim Abrossimov" <vadim_abrossimov@yahoo.com>]

Following up the dicussion started on the linux-kernel list.

On Sun, 13 Feb 2005 16:46:52 +0000, Al Viro  
<viro@parcelfarce.linux.theplanet.co.uk> wrote:
> Err...  FWIW, aforementioned patch lacks e.g. vmlinux.lds.S.  The latest
> I have on anonftp is ftp.linux.org.uk/pub/people/viro/UML-kbuild; there's
> more in my local tree, but that's a separate story.

Apparently my changes to support 'O=' are quite obsolete: I was not aware  
about
the pending patches on http://user-mode-linux.sourceforge.net/patches.html  
and about
this mailing list dedicated to the uml development to which I have just  
subscribed.
Now I'm aware :->

The second change proposed in my patch concerned USER_OBJS dependences:
I removed specific rules using the generic Kbuild rule just overwriting  
'c_flags':

-$(USER_OBJS) : %.o: %.c
-	$(CC) $(CFLAGS_$(notdir $@)) $(USER_CFLAGS) -c -o $@ $<
+$(USER_OBJS) : c_flags = -Wp,-MD,$(depfile) $(CFLAGS_$(notdir $@))  
$(USER_CFLAGS)
+

I agree that it's not very elegant and robust but it does the job and  
could be useful until
Kbuild will provide a clean way to do it.

If you think useful, I may create a patch with this change only.
Should I do it against 2.6.10 as an add-on to the  
http://user-mode-linux.sourceforge.net/patches.html
tarball?

That lead me to another question: why we don't use directly BitKeeper? We  
could have a repository for uml
development.

Dima




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