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

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Message-ID: <20080611154816.GA8167@c2.user-mode-linux.org>
Date:	Wed, 11 Jun 2008 11:48:16 -0400
From:	Jeff Dike <jdike@...toit.com>
To:	Sam Ravnborg <sam@...nborg.org>
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

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

			Jeff

-- 
Work email - jdike at linux dot intel dot com
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