Re: [Xenomai-help] Using xeno-config in cross compiling

[Philippe Gerum <rpm@xenomai.org>]

On Mon, 2009-04-20 at 15:17 -0400, jeff angielski wrote:
> On Sun, 2009-04-19 at 00:42 +0200, Philippe Gerum wrote:
> > On Sat, 2009-04-18 at 16:57 -0400, jeff angielski wrote:
> > > 
> > > What is the proper way to cross compiler a POSIX skin application in a
> > > cross compiler development setup?
> > > 
> > 
> > The way you did it is probably ok; but you may want to tell xeno-config
> > where to find the staging directory via the DESTDIR variable, so it can
> > locate all the host files it needs locally (e.g. posix.wrappers).
> > 
> > i.e.
> > 
> > DESTDIR=/srv/nfs/srp-xen /srv/nfs/srp-xen/usr/xenomai/bin/xeno-config
> > --posix-cflags ...
> 
> This compiles but won't run as-is on the target because it complains
> it's missing the pthread_rt library.
> 
> # ./readirq-posix
> ./readirq-posix: error while loading shared libraries:
> libpthread_rt.so.1: cannot open shared object file: No such file or
> directory
> 
> # ldd ./readirq-posix
>         linux-vdso32.so.1 =>  (0x00100000)
>         libpthread_rt.so.1 => not found
>         libpthread.so.0 => /lib/libpthread.so.0 (0x0ff98000)
>         librt.so.1 => /lib/librt.so.1 (0x0ff40000)
>         libc.so.6 => /lib/libc.so.6 (0x0fda1000)
>         /lib/ld.so.1 (0x48000000)
> 
> 
> I used LD_LIBRARY_PATH to get it to work but it seems like I must be
> missing a step somewhere in the process.
> 
> # LD_LIBRARY_PATH=/usr/xenomai/lib ./readirq-posix
> 
> 
> Do other people cross compiling for POSIX skins have to do this?
> 

You need to set up your dynamic linker config properly on the target;
see ldconfig related files, and particularly ld.so.conf (or ld.so.conf.d
with newer ld.so versions).

> TIA,
> Jeff
> 
-- 
Philippe.