linux-kernel - Re: kbuild breaks um - fails to find util when linking

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Date:	Sat, 14 Jun 2008 01:08:44 +0200
From:	Gabriel C <nix.or.die@...glemail.com>
To:	Sam Ravnborg <sam@...nborg.org>
CC:	Jeff Dike <jdike@...toit.com>,
	linux-kbuild <linux-kbuild@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: kbuild breaks um - fails to find util when linking

Sam Ravnborg wrote:

Hi Sam , Jeff ,

> On Thu, Jun 12, 2008 at 04:13:15PM -0400, Jeff Dike wrote:
>> On Thu, Jun 12, 2008 at 08:08:59PM +0200, Sam Ravnborg wrote:
>>> Following patch will result in a building ARCH=um kernel.
>>> If it works I dunno.
>> You can just try running it.  Given its behavior with this patch so
>> far, it would be an excellent sign for it to figure out that it has no
>> root filesystem and panic.
>>
>> Anyway, I can't get it to give me a UML binary.  I see this in the
>> build output (and V=3 doesn't make it any more verbose):
>>
>>
>> 	  CHK     include/linux/compile.h
>> 	  LINK linux
>>
>> 	Compilation finished at Thu Jun 12 16:11:15
>>
>> but no linux or vmlinux in my output directory.
> 
> So appearantly kbuild thinks you have a vmlinux
> so no need to relink.
> And the line "LINK linux" implies this as well.
> 
> Please double check that you do not have a vmlinux,
> and try V=2" to see where LINK picks up the vmlinux.
> 
> My build finised:
> $ ./linux
>  ./linux: /usr/lib/libc.so.1: bad ELF interpreter: No such file or directory


I didn't tested this patch but I think LINK-$(CONFIG_LD_SCRIPT_DYN) should have -rpath / -rpath-link too since 
libc.so.* is usually in /lib and not /usr/lib.

Another thing I noticed is this hunk :

+$(shell $(CC) -print-file-name=ld-linux.so.2) \

On 64bit that should not work since it is ld-linux-x86-64.so.2 and not ld-linux.so.2

> 

> So I will take an additional look tomorrow.
> 
> 	Sam


Regards ,

Gabriel
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