[SOLVED] Shared object library not able to load in LabVIEW and Redhat 7.5 Linux

JHugh · 07-18-2018, 09:13 AM

I am running the following:
Redhat Linux 7.5 64 bit
LabVIEW 2017 32 bit

I programmed a shared object library using Eclipse (downloaded and possibility configured by National Instruments) that worked on a cRIO running NI Linux 32 bit OS. However, when trying to port the shared object library onto my Redhat Linux machine, it does not work.

When trying to simply load the library in LabVIEW, I get the following error:
"The library selected is not valid for the current platform. For example, you are running 32-bit LabVIEW and the library might be a 64-bit library."

How can I fix this error? I'm not too familiar with C compilers for linux i.e. I've only used Eclipse without changing too many compiler settings. I do have the C code for the shared object library, so maybe (I'm not sure how) I could recompile it for Redhat 7.5 Linux?

A little more info:
I put the .so file in /usr/lib

I receive the following error when trying to install the library through the terminal so maybe it's a compiler issue?

Code:

sudo ldconfig -n -v /usr/lib
[sudo] password for hughj: 
/usr/lib:
ldconfig: /usr/lib/libTCPIPv6.so is for unknown machine 40.

	libglibmm_generate_extra_defs-2.4.so.1 -> libglibmm_generate_extra_defs-2.4.so.1.3.0
	libdbus-glib-1.so.2 -> libdbus-glib-1.so.2.2.2
	libexpat.so.1 -> libexpat.so.1.6.0
	libpciaccess.so.0 -> libpciaccess.so.0.11.1
	libavahi-glib.so.1 -> libavahi-glib.so.1.0.2
	libavahi-common.so.3 -> libavahi-common.so.3.5.3
	libglapi.so.0 -> libglapi.so.0.0.0
	libavahi-client.so.3 -> libavahi-client.so.3.2.9
	libXxf86vm.so.1 -> libXxf86vm.so.1.0.0
	libdbus-1.so.3 -> libdbus-1.so.3.14.14
	libudev.so.1 -> libudev.so.1.6.2
	libsystemd.so.0 -> libsystemd.so.0.6.0
	libxshmfence.so.1 -> libxshmfence.so.1.0.0
	libsystemd-login.so.0 -> libsystemd-login.so.0.9.3
	libsystemd-journal.so.0 -> libsystemd-journal.so.0.11.5
	libXdamage.so.1 -> libXdamage.so.1.1.0
	libsystemd-id128.so.0 -> libsystemd-id128.so.0.0.28
	libXfixes.so.3 -> libXfixes.so.3.1.0
	libsystemd-daemon.so.0 -> libsystemd-daemon.so.0.0.12
	libglibmm-2.4.so.1 -> libglibmm-2.4.so.1.3.0
	libnss_mymachines.so.2 -> libnss_mymachines.so.2
	libnss_myhostname.so.2 -> libnss_myhostname.so.2
	libgiomm-2.4.so.1 -> libgiomm-2.4.so.1.3.0
	libpamc.so.0 -> libpamc.so.0.82.1
	libsigc-2.0.so.0 -> libsigc-2.0.so.0.0.0
	libpam_misc.so.0 -> libpam_misc.so.0.82.0
	libpam.so.0 -> libpam.so.0.83.1
	libdb-5.3.so -> libdb-5.3.so
	libGL.so.1 -> libGL.so.1.2.0
	libcrack.so.2 -> libcrack.so.2.9.0
	libkms.so.1 -> libkms.so.1.0.0
	libcap.so.2 -> libcap.so.2.22
	libattr.so.1 -> libattr.so.1.1.0
	libdrm_radeon.so.1 -> libdrm_radeon.so.1.0.1
	libauparse.so.0 -> libauparse.so.0.0.0
	libdrm_nouveau.so.2 -> libdrm_nouveau.so.2.0.0
	libaudit.so.1 -> libaudit.so.1.0.0
	libdrm_intel.so.1 -> libdrm_intel.so.1.0.0
	libcap-ng.so.0 -> libcap-ng.so.0.0.0
	libdrm_amdgpu.so.1 -> libdrm_amdgpu.so.1.0.0
	libdw.so.1 -> libdw-0.170.so
	libdrm.so.2 -> libdrm.so.2.4.0
	libgcrypt.so.11 -> libgcrypt.so.11.8.2
	liblzma.so.5 -> liblzma.so.5.2.2
	libsepol.so.1 -> libsepol.so.1
	libblkid.so.1 -> libblkid.so.1.1.0
	libasm.so.1 -> libasm-0.170.so
	libpcreposix.so.0 -> libpcreposix.so.0.0.1
	libpcrecpp.so.0 -> libpcrecpp.so.0.0.0
	libpcre32.so.0 -> libpcre32.so.0.0.0
	libpcre16.so.0 -> libpcre16.so.0.2.0
	libpcre.so.1 -> libpcre.so.1.2.0
	libuuid.so.1 -> libuuid.so.1.3.0
	libstdc++.so.6 -> libstdc++.so.6.0.19
	libzip.so.2 -> libzip.so.2.1.0
	libgpg-error.so.0 -> libgpg-error.so.0.10.0
	libz.so.1 -> libz.so.1.2.7
	libXinerama.so.1 -> libXinerama.so.1.0.0
	libX11-xcb.so.1 -> libX11-xcb.so.1.0.0
	libelf.so.1 -> libelf-0.170.so
	libxcb-xvmc.so.0 -> libxcb-xvmc.so.0.0.0
	libxcb-xv.so.0 -> libxcb-xv.so.0.0.0
	libgthread-2.0.so.0 -> libgthread-2.0.so.0.5400.2
	libxcb-xtest.so.0 -> libxcb-xtest.so.0.0.0
	libxcb-xselinux.so.0 -> libxcb-xselinux.so.0.0.0
	libgobject-2.0.so.0 -> libgobject-2.0.so.0.5400.2
	libxcb-xkb.so.1 -> libxcb-xkb.so.1.0.0
	libxcb-xinput.so.0 -> libxcb-xinput.so.0.1.0
	libgmodule-2.0.so.0 -> libgmodule-2.0.so.0.5400.2
	libxcb-xinerama.so.0 -> libxcb-xinerama.so.0.0.0
	libglib-2.0.so.0 -> libglib-2.0.so.0.5400.2
	libxcb-xfixes.so.0 -> libxcb-xfixes.so.0.0.0
	libxcb-xf86dri.so.0 -> libxcb-xf86dri.so.0.0.0
	libgio-2.0.so.0 -> libgio-2.0.so.0.5400.2
	libxcb-xevie.so.0 -> libxcb-xevie.so.0.0.0
	libbz2.so.1 -> libbz2.so.1.0.6
	liblz4.so.1 -> liblz4.so.1.7.5
	libffi.so.6 -> libffi.so.6.0.1
	libxcb-screensaver.so.0 -> libxcb-screensaver.so.0.0.0
	libselinux.so.1 -> libselinux.so.1
	libmount.so.1 -> libmount.so.1.1.0
	libxcb-sync.so.1 -> libxcb-sync.so.1.0.0
	libthread_db.so.1 -> libthread_db-1.0.so
	libxcb-randr.so.0 -> libxcb-randr.so.0.1.0
	librt.so.1 -> librt-2.17.so
	libresolv.so.2 -> libresolv-2.17.so
	libxcb-present.so.0 -> libxcb-present.so.0.0.0
	libpthread.so.0 -> libpthread-2.17.so
	libxcb-dri3.so.0 -> libxcb-dri3.so.0.0.0
	libnss_nisplus.so.2 -> libnss_nisplus-2.17.so
	libXext.so.6 -> libXext.so.6.4.0
	libnss_dns.so.2 -> libnss_dns-2.17.so
	libxcb-dri2.so.0 -> libxcb-dri2.so.0.0.0
	libnss_db.so.2 -> libnss_db-2.17.so
	libxcb-dpms.so.0 -> libxcb-dpms.so.0.0.0
	libnss_compat.so.2 -> libnss_compat-2.17.so
	libxcb-shm.so.0 -> libxcb-shm.so.0.0.0
	libnsl.so.1 -> libnsl-2.17.so
	libxcb-damage.so.0 -> libxcb-damage.so.0.0.0
	libxcb-shape.so.0 -> libxcb-shape.so.0.0.0
	libm.so.6 -> libm-2.17.so
	libxcb-glx.so.0 -> libxcb-glx.so.0.0.0
	libdl.so.2 -> libdl-2.17.so
	libxcb-composite.so.0 -> libxcb-composite.so.0.0.0
	libcrypt.so.1 -> libcrypt-2.17.so
	libcidn.so.1 -> libcidn-2.17.so
	libgcc_s.so.1 -> libgcc_s-4.8.5-20150702.so.1
	libxcb-res.so.0 -> libxcb-res.so.0.0.0
	libc.so.6 -> libc-2.17.so
	libXau.so.6 -> libXau.so.6.0.0
	libxcb-render.so.0 -> libxcb-render.so.0.0.0
	libanl.so.1 -> libanl-2.17.so
	libmemusage.so -> libmemusage.so
	libSegFault.so -> libSegFault.so
	libpcprofile.so -> libpcprofile.so
	libnss_files.so.2 -> libnss_files-2.17.so
	libBrokenLocale.so.1 -> libBrokenLocale-2.17.so
	libnss_hesiod.so.2 -> libnss_hesiod-2.17.so
	ld-linux.so.2 -> ld-2.17.so
	libxcb-record.so.0 -> libxcb-record.so.0.0.0
	libfreeblpriv3.so -> libfreeblpriv3.so
	libfreebl3.so -> libfreebl3.so
	libutil.so.1 -> libutil-2.17.so
	libX11.so.6 -> libX11.so.6.3.0
	libnss_nis.so.2 -> libnss_nis-2.17.so
	libxcb.so.1 -> libxcb.so.1.1.0
/usr/lib/sse2: (hwcap: 0x0000000004000000)
/usr/lib/i686: (hwcap: 0x0008000000000000)

Thanks!

pan64 · 07-19-2018, 02:02 AM

would be nice to execute:
file /usr/lib/libTCPIPv6.so
file /usr/lib/<some other so>, like ld-2.17.so

I think all of them 64bit libraries, therefore cannot be used with a 32bit app, like your LabVIEW.
You ought to compile that lib in 32bit mode or download/install it from the net.
Probably you only need to check eclipse there should be an option somewhere to configure the target platform.

JHugh · 07-19-2018, 07:16 AM

Quote:

Originally Posted by pan64

would be nice to execute:
file /usr/lib/libTCPIPv6.so
file /usr/lib/<some other so>, like ld-2.17.so

I think all of them 64bit libraries, therefore cannot be used with a 32bit app, like your LabVIEW.
You ought to compile that lib in 32bit mode or download/install it from the net.
Probably you only need to check eclipse there should be an option somewhere to configure the target platform.

That could be it, since I compiled for an NI cRIO 32bit Linux board.

I'm not very familiar with Eclipse. What settings should I use to compile for RedHat 7.5 64bit running LabVIEW 2017 32bit? When I searched on the web, it said I should use the -m32 flag, but my Eclipse will not compile if I use that.

I cannot download the lib from the web because it is a custom C code that I wrote for LabVIEW.

Any chance I can post the code (only two files a .c and a .h) and someone who understands compiling better compiles it for my system and sends me the shared object library? That or explain what settings I should use?

Thanks.

pan64 · 07-19-2018, 07:21 AM

so you have a single .c and .h file?
that you can use a simple makefile to build it.

Code:

CC=gcc
LD=gcc
OBJECTS=yourfile.o

.c.o:
    $(GCC) -W all -o $@ -c $< # begins with tab

libTCPIPv6.so: $(OBJECTS)
    $(LD) -shared -o $@ $(OBJECTS) # begins with tab

https://www.cprogramming.com/tutoria...linux-gcc.html
http://codechunks.org/blog/2012/10/2...hared-library/

or just simply execute:

Code:

gcc -o file.o -c file.c
gcc -shared -o libXXX.so file.o

also you may need to add -m32 to gcc.
These are not tested, so probably you need to check how it really works.

JHugh · 07-19-2018, 08:55 AM

Thanks! That worked!

I'm now running into a new issue, but it's more of a networking problem, so I'll post it in a different subforum.

JHugh · 07-19-2018, 09:24 AM

It's able to load, but I'm running into a Networking problem which I posted here: https://www.linuxquestions.org/quest...de-4175634450/

Though maybe it's a compiling problem since it worked fine between a Windows 10 PC and an NI cRIO running NI Linux.

Would building it through the terminal like that generate error messages if it cannot find the proper includes?

I'm including these:
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>

#include <arpa/inet.h>

#include <errno.h>
#include <fcntl.h>

pan64 · 07-20-2018, 12:35 AM

as it was told: post the relevant code, commands you tried and the response. Exactly.

JHugh · 07-20-2018, 08:01 AM

Quote:

Originally Posted by pan64

as it was told: post the relevant code, commands you tried and the response. Exactly.

Thanks!

Will do.

I'll post the code on my other post, so this one I can mark solved.

Thanks for you help!