How to compile to avoid shared library errors? - mysql

Question

I need to develop a program using MySQL C API. I will develop it on my CentOS virtual machine and run it on RedHat servers. I compiled a some kind of Hello World program and transferred it to the server. But I get an error about shared libraries.
$ ./test1
./test1: error while loading shared libraries: libssl.so.10: cannot open shared object file: No such file or directory
I see that this library exists but with a slightly different name:
$ ls -l /usr/lib/libssl*
-rw-r--r-- 1 root root 458752 Aug 13 17:27 /usr/lib/libssl.a
lrwxrwxrwx 1 root root 26 Sep 14 01:26 /usr/lib/libssl.so -> ../../lib/libssl.so.0.9.8er
-rwxr-xr-x 1 root root 217560 Nov 9 12:22 /usr/lib/libssl3.so
Since I am not root on the server, I can't simply make a symbolic link. I will distribute my program to many people without root privilege and system administration skills. Is there a safe way of compiling my program to avoid such errors?
here is my simple program:
#include <my_global.h>
#include <mysql.h>
int main(int argc, char **argv)
{
printf("MySQL client version: %s\n", mysql_get_client_info());
}
and, this is how I compiled it:
gcc version.c -o version `mysql_config --cflags --libs`
output of ldd ./test1:
linux-gate.so.1 => (0x00685000)
libmysqlclient.so.16 => /usr/lib/mysql/libmysqlclient.so.16 (0x00a8c000)
libz.so.1 => /lib/libz.so.1 (0x00110000)
libcrypt.so.1 => /lib/libcrypt.so.1 (0x00240000)
libnsl.so.1 => /lib/libnsl.so.1 (0x002b7000)
libm.so.6 => /lib/libm.so.6 (0x00f5a000)
libssl.so.10 => /usr/lib/libssl.so.10 (0x00e0c000)
libcrypto.so.10 => /usr/lib/libcrypto.so.10 (0x002d1000)
libc.so.6 => /lib/libc.so.6 (0x004d3000)
libfreebl3.so => /lib/libfreebl3.so (0x00686000)
/lib/ld-linux.so.2 (0x00977000)
libgssapi_krb5.so.2 => /lib/libgssapi_krb5.so.2 (0x006ea000)
libkrb5.so.3 => /lib/libkrb5.so.3 (0x00123000)
libcom_err.so.2 => /lib/libcom_err.so.2 (0x00804000)
libk5crypto.so.3 => /lib/libk5crypto.so.3 (0x001f4000)
libresolv.so.2 => /lib/libresolv.so.2 (0x0021b000)
libdl.so.2 => /lib/libdl.so.2 (0x00dbf000)
libkrb5support.so.0 => /lib/libkrb5support.so.0 (0x00234000)
libkeyutils.so.1 => /lib/libkeyutils.so.1 (0x00f0b000)
libpthread.so.0 => /lib/libpthread.so.0 (0x00e72000)
libselinux.so.1 => /lib/libselinux.so.1 (0x00862000)
output of mysql_config --cflags --libs:
-I/usr/include/mysql -g -pipe -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m32 -fasynchronous-unwind-tables -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -fno-strict-aliasing -fwrapv -fPIC -DUNIV_LINUX
-rdynamic -L/usr/lib/mysql -lmysqlclient -lz -lcrypt -lnsl -lm -lssl -lcrypto

Answer 1

Your binary is compiled against openssl version 1.0.x and therefore requires openssl major version 1. The target machine has version 0.9.8, which is major version 0. Different major versions are considered incompatible, hence the error.

Answer 2

Read up on ld.so and its variables such as LD_LIBRARY_PATH and LD_PRELOAD-- you can install, say libssl.so in your own ~/lib/ and have the dynamic linker find that.
Needless to say, you are much better off doing this via the package management system.