linux-kernel - Re: [PATCH, v2] kbuild: Improve version string logic

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Date:	Tue, 13 Oct 2009 09:07:13 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Frans Pop <elendil@...net.nl>,
	Dirk Hohndel <hohndel@...radead.org>,
	Len Brown <lenb@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH, v2] kbuild: Improve version string logic


* David Rientjes <rientjes@...gle.com> wrote:

> On Mon, 12 Oct 2009, Ingo Molnar wrote:
> 
> > diff --git a/Makefile b/Makefile
> > index 927d7a3..5dab509 100644
> > --- a/Makefile
> > +++ b/Makefile
> > @@ -963,8 +963,6 @@ localver = $(subst $(space),, $(string) \
> >  # .scmversion is used when generating rpm packages so we do not loose
> >  # the version information from the SCM when we do the build of the kernel
> >  # from the copied source
> > -ifdef CONFIG_LOCALVERSION_AUTO
> > -
> >  ifeq ($(wildcard .scmversion),)
> >          _localver-auto = $(shell $(CONFIG_SHELL) \
> >                           $(srctree)/scripts/setlocalversion $(srctree))
> > @@ -972,7 +970,14 @@ else
> >          _localver-auto = $(shell cat .scmversion 2> /dev/null)
> >  endif
> >  
> > +ifdef CONFIG_LOCALVERSION_AUTO
> >  	localver-auto  = $(LOCALVERSION)$(_localver-auto)
> > +else
> > +	ifeq ($_localver-auto,)
> > +		localver-auto = $(LOCALVERSION)
> > +	else
> > +		localver-auto = $(LOCALVERSION)+
> > +	endif
> >  endif
> >  
> >  localver-full = $(localver)$(localver-auto)
> 
> I don't see where the `+' is dropped between -rc tags; 
> scripts/setlocalversion should return -00000-rc5 for v2.6.32-rc5, for 
> example, so _localver-auto will always be non-NULL and the `+' is 
> appended.
> 
> I think scripts/setlocalversion should also be modified as I earlier 
> suggested to suppress output when git-describe shows no additional 
> commits beyond the tag.  Then, CONFIG_LOCALVERSION_AUTO would not be 
> v2.6.32-rc4-00000-rc4, for example, when 2.6.32-rc4 is released.
> 
> Your patch also adds the make LOCALVERSION= string to the version 
> without requiring CONFIG_LOCALVERSION_AUTO.  That's a change from 
> prior behavior, but I think it's helpful for user-specified version 
> tags.

Good points - the patch is defective in its current form. Anyone 
interested in fixing it? I'll be busy with other things.

	Ingo
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