linux-kernel - Re: [PATCH] KBUILD: Create the source symlink earlier in the objdir

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Message-ID: <20090215103659.GC31088@uranus.ravnborg.org>
Date:	Sun, 15 Feb 2009 11:36:59 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KBUILD: Create the source symlink earlier in the objdir

On Sat, Jan 10, 2009 at 04:56:13AM +0100, Andi Kleen wrote:
> KBUILD: Create the source symlink earlier in the objdir
> 
> It's useful to already have the source symlink in a 
> objdir when one just runs make *config. Then one
> can do 
> 
> mkdir obj-allyes
> cd obj-allyes
> make -C ../sourcedir O=$(pwd) allyesconfig
> ./source/scripts/config --disable debug_info
> make CC=icecc -j18
> 
> without having to interrupt the make first just to
> get the source symlink.
> 
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> 
> ---
>  Makefile |    1 +
>  1 file changed, 1 insertion(+)
> 
> 
> Index: linux-2.6.28-kbuild/Makefile
> ===================================================================
> --- linux-2.6.28-kbuild.orig/Makefile	2009-01-07 22:16:49.000000000 +0100
> +++ linux-2.6.28-kbuild/Makefile	2009-01-10 04:50:53.000000000 +0100
> @@ -383,6 +383,7 @@
>  # output directory.
>  outputmakefile:
>  ifneq ($(KBUILD_SRC),)
> +	@ln -fsn $(srctree) $(objtree)/source
>  	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
>  	    $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
>  endif

But we do not want to create this symlink in two places.
So the following is better:

	Sam

diff --git a/Makefile b/Makefile
index 22d7584..76ee131 100644
--- a/Makefile
+++ b/Makefile
@@ -388,6 +388,7 @@ PHONY += outputmakefile
 # separate output directory. This allows convenient use of make in the
 # output directory.
 outputmakefile:
+	$(Q)ln -fsn $(srctree) source
 ifneq ($(KBUILD_SRC),)
 	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 	    $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
@@ -946,7 +947,6 @@ ifneq ($(KBUILD_SRC),)
 	    mkdir -p include2;                                          \
 	    ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm;     \
 	fi
-	ln -fsn $(srctree) source
 endif
 
 # prepare2 creates a makefile if using a separate output directory
--
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