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

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Message-ID: <20080611194914.GB12794@uranus.ravnborg.org>
Date:	Wed, 11 Jun 2008 21:49:14 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Jeff Dike <jdike@...toit.com>
Cc:	linux-kbuild <linux-kbuild@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: kbuild breaks um - fails to find util when linking

On Wed, Jun 11, 2008 at 11:48:16AM -0400, Jeff Dike wrote:
> This patch obviously isn't usable for anyone else, but UML needs a
> hook or something to add libgcc and libc to the ld commands:
> 
> Index: linux-2.6-git/scripts/link-vmlinux.sh
> ===================================================================
> --- linux-2.6-git.orig/scripts/link-vmlinux.sh	2008-06-11 11:26:07.000000000 -0400
> +++ linux-2.6-git/scripts/link-vmlinux.sh	2008-06-11 11:41:04.000000000 -0400
> @@ -122,7 +122,7 @@ fi
>  # First stage of fully linked vmlinux
>  tell LD ${VMLINUX}
>  ${LD} ${LDFLAGS} ${LDFLAGS_vmlinux} -o ${VMLINUX} \
> -      -T ${KBUILD_VMLINUX_LDS} vmlinux.o
> +      -T ${KBUILD_VMLINUX_LDS} vmlinux.o `gcc -print-libgcc-file-name` -lc
>  
>  if [ "${CONFIG_KALLSYMS}" = "y" ]; then
>  
> @@ -133,7 +133,8 @@ if [ "${CONFIG_KALLSYMS}" = "y" ]; then
>          # link in kalll symbols
>  	tell LD vmlinux
>          ${LD} ${LDFLAGS} ${LDFLAGS_vmlinux} -o vmlinux \
> -         -T ${KBUILD_VMLINUX_LDS} vmlinux.o .tmp_kallsyms.o
> +         -T ${KBUILD_VMLINUX_LDS} vmlinux.o .tmp_kallsyms.o \
> +	    `gcc -print-libgcc-file-name` -lc
>  fi
>  
>  tell SYSMAP System.map
> 
> This fixes the flood of undefined symbols, but I still get this on the
> link:
>     ld: warning: Cannot create .note.gnu.build-id section, --build-id ignored.
>     ld: warning: cannot find entry symbol _start; defaulting to 08056320
> 
> And when I run the result, I get this, which I don't understand at
> all:
> 
>     -bash: ./uml/linux: /usr/lib/libc.so.1: bad ELF interpreter: No
> such file or directory

Thanks Jeff.

I will take an additional look tomorrow.

	Sam
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