Re: [Xenomai-help] unresolved symbol - check the xenomai installation

[Philippe Gerum <rpm@xenomai.org>]

On 01/08/2012 09:38 PM, Jakub Nowacki wrote:
> On 06/01/12 09:40, Gilles Chanteperdrix wrote:
>  > This is not the same issue as Gregory. Gregory missing symbols were from
>  > libnative, and we know that examples makefiles include -lnative, so,
>  > libnative is probably not installed in the place where the linker looks
>  > for it: that is an installation issue.
>  > On the other hands, the symbols from the errors you show us are defined
>  > in libxenomai.so. So, the RTXI build system is likely using hardcoded
>  > flags instead of the flags returned by xeno-config: that is a makefile
>  > issue.
>  >
>
> OK, maybe my problem is not similar but I still get unresolved
> reference. Below I show the full listing when compilation fails
>
> /bin/bash ../libtool --tag=CXX --mode=link g++ -pipe -Wall
> -I/usr/share/qt3/include -DQT_THREAD_SUPPORT -O2 -L/usr/share/qt3/lib
> -lqt-mt -lSM -lICE -lX11 -lXext -lXmu -lXt -lXi -lgsl -lgslcblas -lm
> -L/usr/xenomai/lib -lxenomai -lpthread -lrt -lnative -o rtxi cmdline.o
> daq.o default_gui_model.o event.o fifo.o io.o main.o main_window.o
> mutex.o plugin.o rt.o rtfile.o rwlock.o sem.o settings.o workspace.o
> rt_os-xenomai.o moc_default_gui_model.o moc_main_window.o moc_plugin.o
> -rdynamic
> libtool: link: g++ -pipe -Wall -I/usr/share/qt3/include
> -DQT_THREAD_SUPPORT -O2 -o rtxi cmdline.o daq.o default_gui_model.o
> event.o fifo.o io.o main.o main_window.o mutex.o plugin.o rt.o rtfile.o
> rwlock.o sem.o settings.o workspace.o rt_os-xenomai.o
> moc_default_gui_model.o moc_main_window.o moc_plugin.o -rdynamic
> -L/usr/share/qt3/lib /usr/lib/libqt-mt.so -lSM -lICE -lX11 -lXext -lXmu
> -lXt -lXi -lgsl -lgslcblas -lm -L/usr/xenomai/lib
> /usr/xenomai/lib/libxenomai.so -lpthread -lrt
> /usr/xenomai/lib/libnative.so -Wl,-rpath -Wl,/usr/xenomai/lib -Wl,-rpath
> -Wl,/usr/xenomai/lib

References should precede definitions. Try swapping libxenomai.so and 
libnative.so in your link order. As Gilles already suggested, using the 
xeno-config script in your Makefile to get the proper link flags would 
have prevented this issue.

> /usr/xenomai/lib/libnative.so: undefined reference to `xeno_current'
> /usr/xenomai/lib/libnative.so: undefined reference to `xeno_sem_heap'
> /usr/xenomai/lib/libnative.so: undefined reference to
> `xeno_sigshadow_install_once'
> /usr/xenomai/lib/libnative.so: undefined reference to `xeno_set_current'
> /usr/xenomai/lib/libnative.so: undefined reference to `xeno_map_heap'
> /usr/xenomai/lib/libnative.so: undefined reference to `xnarch_tsc_to_ns'
> /usr/xenomai/lib/libnative.so: undefined reference to
> `xeno_handle_mlock_alert'
> /usr/xenomai/lib/libnative.so: undefined reference to `xeno_fault_stack'
> /usr/xenomai/lib/libnative.so: undefined reference to
> `xeno_set_current_mode'
> /usr/xenomai/lib/libnative.so: undefined reference to `xeno_bind_skin_opt'
> /usr/xenomai/lib/libnative.so: undefined reference to `xeno_current_mode'
> /usr/xenomai/lib/libnative.so: undefined reference to `xnarch_ns_to_tsc'
> collect2: ld returned 1 exit status
> make[1]: *** [rtxi] Error 1
> make[1]: Leaving directory `/usr/src/rtxi-1.31/rtxi'
> make: *** [all-recursive] Error 1
>
> I use xeno-config to get flags, as you can see in the above libtool
> command. I'm not the expert on autotools, but everything seems to look
> OK. I even tried to add xenomai LD_LIBRARY_PATH, but the result is still
> the same. I think I give it a go with 2.5.6 and see if the error is
> there; I installed xenomai 2.5.6 for RTXI a couple of times on different
> machines and I don't recall this problem. Just to be absolutely clear,
> I'm suing Ubuntu 11.04 with GCC 4.6 (I checked 4.5 and I get the same
> thing).
>
> Best wishes,
>
> Jakub
>
>
>
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-- 
Philippe.