Hi,
Why don't you link the shared lib at compilation ?
Regards,
S.Ancelot
Le 29/05/2017 à 23:19, Fyleo a écrit :
Hello all,
I'm trying to port machinekit (machinekit.io) to xenomai 3.0.4 which
support only xenomai 2.6.4 for the moment.
This software is design this way :
A : main executable
B : shared library abstracting thread API, with one library for posix,
for xenomai, ...
The xenomai B library is linked against alchemy, copperplate, ...
(xeno-config --ldflags --auto-init-solib --skin=alchemy)
The program works in a way that, at start time, it load with dlopen
the configured API (B).
My problem is that dlopen(with RTLD_GLOBAL|RTLD_NOW) fail with the
error : "/usr/lib/libcopperplate.so.0: undefined symbol: main"
Here is the simplified test case to reproduce the problem :
main.c:
#include <stdio.h>
#include <stdlib.h>
#include <dlfcn.h>
int main(int argc, char *const argv[])
{
void *handle;
handle = dlopen("./ulapi-xenomai.so", RTLD_GLOBAL|RTLD_NOW);
if (!handle) {
fprintf(stderr, "%s\n", dlerror());
exit(EXIT_FAILURE);
}
dlclose(handle);
exit(EXIT_SUCCESS);
}
gcc main.c -o testcase -ldl
gcc -Wl,-soname,ulapi-xenomai.so -shared -o ulapi-xenomai.so
`xeno-config --ldflags --auto-init-solib --skin=alchemy`
run testcase
I am missing something or is there a solution that doesn't imply to
use RTLD_LAZY ?
my xeno-config --info
Xenomai version: Xenomai/cobalt v3.0.4
Linux beaglebone 4.4.62-ti-xenomai-r105 #1 SMP Wed May 24 00:09:09 UTC
2017 armv7l GNU/Linux
Kernel parameters: console=ttyO0,115200n8
capemgr.disable_partno=BB-BONELT-HDMI
bone_capemgr.uboot_capemgr_enabled=1 root=/dev/mmcblk0p1 ro
rootfstype=ext4 rootwait coherent_pool=1M net.ifnames=0 quiet
I-pipe release #7 detected
Cobalt core 3.0.4 detected
Compiler: gcc version 4.9.2 (Debian 4.9.2-10)
Build args: --prefix=/usr --includedir=/usr/include/xenomai
--mandir=/usr/share/man --with-testdir=/usr/lib/xenomai/testsuite
--enable-dlopen-libs --enable-smp --build arm-linux-gnueabihf
build_alias=arm-linux-gnueabihf
Regards,
Fyleo
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