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

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Date:	Mon, 12 Oct 2009 19:00:21 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Ingo Molnar <mingo@...e.hu>
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

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.
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