[uml-devel] pcap cross-linking

[Antoine Martin <antoine@nagafix.co.uk>]

Paolo,

pcap builds and runs fine on amd64 but there is a problem when building
with SUBARCH=i386: it uses the wrong version of libpcap.a:
ld -r -dp -o arch/um/drivers/pcap.o arch/um/drivers/pcap_kern.o
arch/um/drivers/pcap_user.o  -m elf_i386
-r /usr/lib/gcc/x86_64-pc-linux-gnu/3.4.4/../../../libpcap.a
Whereas the one it needs to link against is here:
/emul/linux/x86/usr/lib/libpcap.a

Fixing the Makefile is beyond me (probably not that hard), sorry - so I
link it manually. After that it works perfectly.

On the subject of pcap transport, I couldn't dig the email where you
suggested a way of figuring out which libraries should be placed in the
chroot, I tried to use the same libraries as I used on a 32-bit setup
but it fails to bring up the interface (when it works outside chroot).

I tried to guess and even added a few more, here is the chroot's /lib (I
made /lib64 a link to /lib in chroot):
ld-2.3.5.so           libcrack.so.2.8.0  libm.so.6
libnss_compat-2.3.5.so  libnss_hesiod-2.3.5.so   libpam.so
libpamc.so       libpcap.so.0.9      librt.so.1        security
ld-linux-x86-64.so.2  libcrypt-2.3.5.so  libncurses.so
libnss_compat.so.2      libnss_hesiod.so.2       libpam.so.0
libpamc.so.0     libpthread-0.10.so  libselinux.so.1   tls
libc-2.3.5.so         libcrypt.so.1      libncurses.so.5
libnss_dns-2.3.5.so     libnss_nis-2.3.5.so      libpam.so.0.78
libpamc.so.0.78  libpthread.so.0     libsemanage.so.1
libc.so.6             libdl-2.3.5.so     libncurses.so.5.4
libnss_dns.so.2         libnss_nis.so.2          libpam_misc.so
libpcap.a        libresolv-2.3.5.so  libsepol.so.1
libcrack.so           libdl.so.2         libnsl-2.3.5.so
libnss_files-2.3.5.so   libnss_nisplus-2.3.5.so  libpam_misc.so.0
libpcap.so       libresolv.so.2      libutil-2.3.5.so
libcrack.so.2         libm-2.3.5.so      libnsl.so.1
libnss_files.so.2       libnss_nisplus.so.2      libpam_misc.so.0.78
libpcap.so.0     librt-2.3.5.so      libutil.so.1
lib/tls:
libc-2.3.5.so  libc.so.6
(also lib/security so I can get into the chroot)
But that's not enough... and ldd didn't show me anything missing.
Any ideas?

Thanks
Antoine



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