How correct linking with libperl.so
I use Fedora Core 16 and try to compile program with embedding perl follows way:
gcc -W -Wall -g -D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE -I. -I/usr/include -I/usr/lib/include -I/usr/lib/perl5/CORE -c program.c
gcc -L/lib -L/usr/lib/perl5/CORE -lperl -o program.run program.o
After trying to run program I getting following message:
error while loading shared libraries: libperl.so: cannot open shared object file: No such file or directory
if execute following command 'ldd program.run' then it output to console
ldd ./program.run
linux-gate.so.1 => (0xb7751000)
libperl.so => not found
libc.so.6 => /lib/libc.so.6 (0x4eea5000)
/lib/ld-linux.so.2 (0x4ee80000)
Yes i can set LD_LIBRARY_PATH environment variable and program will be work, but if i execute same command for '/usr/bin/perl' library will be found without setting specific environment variable e.g
ldd `which perl`
linux-gate.so.1 => (0xb77f4000)
libperl.so => /usr/lib/perl5/CORE/libperl.so (0xb767b000)
libresolv.so.2 => /lib/libresolv.so.2 (0x4f22f000)
libnsl.so.1 => /lib/libnsl.so.1 (0x42eaf000)
libdl.so.2 => /lib/libdl.so.2 (0x4f055000)
libm.so.6 => /lib/libm.so.6 (0x4f085000)
libcrypt.so.1 => /lib/libcrypt.so.1 (0x41ee6000)
libutil.so.1 => /lib/libutil.so.1 (0x42ecc000)
libpthread.so.0 => /lib/libpthread.so.0 (0x4f05c000)
libc.so.6 => /lib/libc.so.6 (0x4eea5000)
/lib/ld-linux.so.2 (0x4ee80000)
libfreebl3.so => /lib/libfreebl3.so (0x42492000)
How correct link program with libperl.so
Adding -Wl,-rpath -Wl,/usr/lib/perl5/CORE (when linking) should help.
You need to set LD_LIBRARY_PATH at runtime for the dynamic linker to find libperl:
LD_LIBRARY_PATH=/usr/lib/perl5/CORE ./program
Related
I have a C shared library named libtest.so which in turn use another shared library lihelp.so.
The code for libtest.so use dlopen() to load the libhelp.so
I have integrated libtest.so with my GO script gotest.go
When I run gotest.go after building and installing, I am seeing libtest.so is getting loaded successfully and function in libtest is executed successfully.
But the dlopen() call in libtest.so to load libhelp.so is failining with error "undefined symbol: dlopen"
But if I write a C application which use libtest.so all execution are fine withour any error.
Here is the code snippet of my Go file
/*
#cgo CFLAGS: -I./include
#cgo LDFLAGS: -L. -ltest -ldl
*/
Here is the Makefile entry for building libtest.so
CC = gcc # C compiler
CFLAGS = -c -fPIC -I./include # C flags
LDFLAGS = -shared -L/lib -ldl # linking flags
Can any one suggest what can be the problem?
Output of ldd of my go binary
ldd app
linux-gate.so.1 => (0xb77c3000)
libtest.so => ./libtest.so (0xb77bc000)
libgo.so.5 => /usr/lib/i386-linux-gnu/libgo.so.5 (0xb6ed0000)
libgcc_s.so.1 => /lib/i386-linux-gnu/libgcc_s.so.1 (0xb6eb2000)
libc.so.6 => /lib/i386-linux-gnu/libc.so.6 (0xb6d03000)
/lib/ld-linux.so.2 (0xb77c4000)
libpthread.so.0 => /lib/i386-linux-gnu/libpthread.so.0 (0xb6ce7000)
libm.so.6 => /lib/i386-linux-gnu/libm.so.6 (0xb6ca1000)
I've compiled source file on host-machine:
g++ -I./source/utils -m32 ./source/services/library_version_info.cpp -o version_info $DAALROOT/lib/ia32_lin/libdaal_core.so $DAALROOT/lib/ia32_lin/libdaal_thread.so -ltbb -liomp5 -lpthread -ldl
# echo $DAALROOT
# /opt/intel/compilers_and_libraries_2016.3.210/linux/daal/
When I'm trying to invoke this on target-machine I get such error:
./version_info: error while loading shared libraries: /opt/intel/compilers_and_libraries_2016.3.210/linux/daal/lib/ia32_lin/libdaal_core.so: cannot open shared object file: No such file or directory
# echo $DAALROOT
# /media/sdcard/daalroot/daal
$LD_LIBRARY_PATH on target-machine contains path to libdaal_core.so, but program does not see that. How can I fix this error?
upd. host g++: 5.4.0, target: 4.9.1
upd2.
ldd version_info
linux-gate.so.1 (0xb77db000)
/opt/intel/compilers_and_libraries_2016.3.210/linux/daal/lib/ia32_lin/libdaal_core.so => not found
/opt/intel/compilers_and_libraries_2016.3.210/linux/daal/lib/ia32_lin/libdaal_thread.so => not found
libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x4332e000)
libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x43221000)
libc.so.6 => /lib/libc.so.6 (0x42e7d000)
libm.so.6 => /lib/libm.so.6 (0x43003000)
/lib/ld-linux.so.2 (0x42e50000)
env LD_DEBUG=all ./version_info
408:
408: file=/opt/intel/compilers_and_libraries_2016.3.210/linux/daal/lib/ia32_lin/libdaal_core.so [0]; needed by ./version_info [0]
./version_info: error while loading shared libraries: /opt/intel/compilers_and_libraries_2016.3.210/linux/daal/lib/ia32_lin/libdaal_core.so: cannot open shared object file: No such file or directory
echo $LD_LIBRARY_PATH
/media/sdcard/daalroot/daal/lib/ia32_lin:/media/sdcard/daalroot/daal/../tbb/lib/ia32_lin/gcc4.4
Solution:
g++ -I./source/utils -m32 ./source/services/library_version_info.cpp -o version_info -l daal_core -l daal_thread -ltbb -liomp5 -lpthread -ldl
A program is linked properly with clang, but not with gcc:
% CC=clang make
clang -I/usr/include/lua5.1 -llua5.1 -shared -fPIC -o mk_lua.so mk_lua.c
% ldd mk_lua.so
linux-vdso.so.1 => (0x00007fff4effe000)
liblua5.1.so.0 => /usr/lib/x86_64-linux-gnu/liblua5.1.so.0 (0x00007fa94b316000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fa94af51000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fa94ac4a000)
libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fa94aa46000)
/lib64/ld-linux-x86-64.so.2 (0x00007fa94b752000)
GCC gives different results (of course, leads to a broken shared library).
% CC=gcc make
gcc -I/usr/include/lua5.1 -llua5.1 -shared -fPIC -o mk_lua.so mk_lua.c
% ldd mk_lua.so
linux-vdso.so.1 => (0x00007fffcf3fe000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fe2e3e06000)
/lib64/ld-linux-x86-64.so.2 (0x00007fe2e43d9000)
gcc version 4.9.1 (Ubuntu 4.9.1-16ubuntu6)
Ubuntu clang version 3.5.0-4ubuntu2 (tags/RELEASE_350/final) (based on LLVM 3.5.0)
Linker options are identical. What is going on here?
Full source is here.
I compiled the original cwm tgz package (not the netbsd one) with
./configure
make
which works without error. After starting cwm with
./cwm
the error
Shared object "libX11.so.7" not found
appears. The ldd output is:
-lXft.2 => /usr/pkg/lib/libXft.so.2
-lfontconfig.1 => /usr/pkg/lib/libfontconfig.so.1
-lfreetype.7 => /usr/X11R7/lib/libfreetype.so.7
-lz.1 => /usr/lib/libz.so.1
-lgcc_s.1 => /usr/lib/libgcc_s.so.1
-lc.12 => /usr/lib/libc.so.12
-lbz2.1 => /usr/lib/libbz2.so.1
-lexpat.2 => /usr/lib/libexpat.so.2
-lXrender.2 => /usr/X11R7/lib/libXrender.so.2
-lXext.7 => /usr/X11R7/lib/libXext.so.7
-lX11.7 => /usr/X11R7/lib/libX11.so.7
-lxcb.1 => /usr/X11R7/lib/libxcb.so.1
-lXau.7 => /usr/X11R7/lib/libXau.so.7
-lXdmcp.7 => /usr/X11R7/lib/libXdmcp.so.7
-lX11.7 => not found
-lXext.7 => not found
where the "not founds" refer to the cwm binary directly. It has been linked with the command
gcc -Wall -Icompat -D_REENTRANT -I/usr/pkg/include\
-I/usr/X11R7/include/freetype2 -I/usr/X11R7/include\
-I/usr/X11R7/include/freetype2 -I/usr/X11R7/include -g -O2\
-I/usr/X11R7/include -o cwm calmwm.o draw.o screen.o xmalloc.o\
client.o grab.o search.o util.o xutil.o conf.o input.o xevents.o\
group.o geographic.o kbfunc.o cursor.o font.o -L/usr/pkg/lib\
-Wl,-R/usr/pkg/lib -lXft -L/usr/X11R7/lib -lX11 -lXext
so the linker should find libX11 and libXext.
Why does the loader complain?
The obvious portion is that ``-Wl,-R/usr/X11R7/lib'' was not included on the loader command line at link time.
NetBSD's runtime loader (/libexec/ld.elf_so) has only the runtime library search path of ``/lib:/usr/lib'' compiled in, so any executable needing additional elements on the search path needs to explicitly add them at compile time. (like the entry for /usr/pkg/lib.)
I installed glibc-2.18 into my home directory and want to link an application against it:
$ g++ -pthread -o tsx_test tsx_test.cpp -Wl,--rpath=/home/hl/lib/ \
-Wl,--dynamic-linker=/home/hl/lib/ld-linux-x86-64.so.2
Compiling and linking works fine using g++4.7.3, however, fails when executing it:
$ ./tsx_test
./tsx_test: error while loading shared libraries: libstdc++.so.6: cannot open shared object file: No such file or directory
/usr/lib/x86_64-linux-gnu/libstdc++.so.6 definitely exists, when I compile without "--rpath" the same libstdc++.so.6 is linked and everything works fine.
$ ldd tsx_test
linux-vdso.so.1 => (0x00007fff42bd4000)
libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f42aa3aa000)
libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f42aa194000)
libpthread.so.0 => /home/hl/lib/libpthread.so.0 (0x00007f42a9f75000)
libc.so.6 => /home/hl/lib/libc.so.6 (0x00007f42a9bc8000)
libm.so.6 => /home/hl/lib/libm.so.6 (0x00007f42a98c5000)
/home/hl/lib/ld-linux-x86-64.so.2 => /lib64/ld-linux-x86-64.so.2 (0x00007f42aa6c9000)
/usr/lib/x86_64-linux-gnu/libstdc++.so.6 definitely exists
... but your libc doesn't look there.
You can set your RPATH like so: -Wl,-rpath=/home/hl/lib:/usr/lib, or you can edit /home/hl/etc/ld.so.conf and tell your libc to look in /usr/lib (after /home/hl/lib).j
Is it a permission problem, can't I mix root owned and user owned libs?
No. You can definitely mix and match root-owned and user-owned libraries.