Re: [uml-devel] Re: pcap cross-linking [PATCH]

[Blaisorblade <blaisorblade@yahoo.it>]

On Monday 19 December 2005 19:33, Antoine Martin wrote:
> > > 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

> > This is IMHO a Gentoo bug -

> I'll ask the gentoo devs, for the time being I can copy this library
> manually to /usr/lib32 (which is the standard location for 32-bit libs
> on amd64)

> But the problem remains, the linker should use:
> -r /usr/lib32/libpcap.a
> and not ../../../libpcap.a which ends up as /usr/lib (which points
> to /usr/lib64 on standard distros)
> But only when building with SUBARCH=i386.

> So I added this statement to the Makefile (patch attached) and now all
> is well:
> +ifeq ($(SUBARCH),i386)
> +LDFLAGS_pcap.o := -r /usr/lib32/libpcap.a
> +else

Yep, seen that - obviously this patch can't be merged as the thing is 
non-standard (not that I know, I just guess this). Just a first guess 
however.

Also, by gross testing on my system (guess Gentoo devs have screwed up 
something else on your system, too). Note the -m32 difference and lib32 vs. 
lib64:

$ gcc -print-file-name=libpcap.a
/usr/lib/gcc/x86_64-pc-linux-gnu/3.4.4/../../../../lib64/libpcap.a
$ gcc -m32 -print-file-name=libpcap.a
/usr/lib/gcc/x86_64-pc-linux-gnu/3.4.4/../../../../lib32/libpcap.a

> chroot without su is pointless (since you can use 'chroot-again' to
> escape)
Indeed.
-- 
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
Paolo Giarrusso, aka Blaisorblade (Skype ID "PaoloGiarrusso", ICQ 215621894)
http://www.user-mode-linux.org/~blaisorblade

	

	
		
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