xerces-c 2.8 : error while loading shared libraries
Question
I'm trying to compile a program running on an HP UX server on a Red Hat Linux.
It uses xerces-c library to parse xml files. Compilation is ok, but when i try to run it, I get the following message
./a.out: error while loading shared libraries: libxerces-c.so.28: cannot open shared object file: No such file or directory
I wrote a very simple program to try and understand whats going on:
#include <xercesc/util/PlatformUtils.hpp>
#include <xercesc/util/TransService.hpp>
#include <xercesc/parsers/SAXParser.hpp>
#include <xercesc/util/OutOfMemoryException.hpp>
int main(int argc, char* argv[])
{
return 0;
}
And compiled it like this:
g++ test.cpp -L./xml/xerces-c_2_8_0/lib -lxerces-c -I./xml/xerces-c_2_8_0/include
Surprisingly the file is actually there:
lib]$ ls
libxerces-c.a libxerces-c.so.28 libxerces-depdom.a libxerces-depdom.so.28
libxerces-c.so libxerces-c.so.28.0 libxerces-depdom.so libxerces-depdom.so.28.0
Any thoughts ? I feel i'm missing something, but don't know what.
Thanks in advance.
Solution
run ldd a.out
and see if the linker can resolve the right .so file
export LD_LIBRARY_PATH
to include the current folder (in the same manner as the PATH variable) and check ldd again
OTHER TIPS
the good way to do what you want is the following one:
g++ test.cpp -Xlinker -R ./xml/xerces-c_2_8_0/lib -lxerces-c -I./xml/xerces-c_2_8_0/include
or
g++ test.cpp -Wl,-rpath ./xml/xerces-c_2_8_0/lib -lxerces-c -I./xml/xerces-c_2_8_0/include
Xlinker or Wl options allow you to use specific linking options, you do not need to modifiy LD_LIBRARY_PATH
You need to tell the runtime c library where to find the various symbols that arent compiled statically in your code and arent in the usualy /lib and /usr/lib locations.
You do this by adding the path to your shared library to LD_LIBRARY_PATH. In this case, this will be what you have been putting for the -L argument to the compiler.