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Date: Wed, 4 Jan 2012 14:30:27 -0800
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From: Garrett Cooper <yanegomi@gmail.com>
To: Luigi Rizzo <rizzo@iet.unipi.it>
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Cc: current@freebsd.org
Subject: Re: add 'ldd' to cross-tools ?
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On Wed, Jan 4, 2012 at 2:29 PM, Luigi Rizzo <rizzo@iet.unipi.it> wrote:
> On Wed, Jan 04, 2012 at 02:10:36PM -0800, Garrett Cooper wrote:
>> On Wed, Jan 4, 2012 at 2:23 PM, Luigi Rizzo <rizzo@iet.unipi.it> wrote:
>> > Hi,
>> > in doing cross-builds of picobsd, i found i need a cross-version
>> > of "ldd" so i can run it on the host to detect which shared libraries
>> > are used by binaries on the target architecture
>> > (for amd64->i386 there is a partial workaround, but don't know
>> > if it works in other cases)
>> >
>> > Is there any concern in adding usr.bin/ldd to the list of cross-tools
>> > in Makefile.inc1 ? It is a small program and should not increase
>> > the build time in any significant way.
>> >
>> > Otherwise, does anyone know the magic to build a cross-arch
>> > version of a program in the FreeBSD source tree ?
>>
>> objdump IMO is a lot easier to parse and it's already built via cross-tools:
>>
>> $ objdump -x `which tar` | awk '$1 == "NEEDED" { print $2 }'
>> libarchive.so.5
>> libbz2.so.4
>> libz.so.6
>> liblzma.so.5
>> libbsdxml.so.4
>> libcrypto.so.6
>> libc.so.7
>
> wonderful, thanks!

    Np! The only gap with both of these tools is that you have to
watch out for dl_open'ed binaries as they won't show up in ldd/objdump
-x. If I could figure out how to detect these with a command line
tool, I would be set for life :).
Thanks,
-Garrett