Question

I want to use one program as a shared library for an other program.

I started as follows:
I have a application which I have compiled using:

/usr/bin/g++ -I/usr/include/libxml2  -Xlinker -zmuldefs -fPIC -c a.cpp
/usr/bin/g++ -I/usr/include/libxml2  -Xlinker -zmuldefs -fPIC -c b.cpp
/usr/bin/g++ -I/usr/include/libxml2  -Xlinker -zmuldefs -fPIC -c c.cpp

Then I have created a shared object library from the objects I get from this file using this command:

g++ -fPIC -Xlinker -zmuldefs -shared -o libabc.so a.o b.o c.o

After this I get the libabc.so file which I copy to the

sudo cp libabc.so /usr/local/lib/libabc.so

Now when I compile my orignal application which will use this newly created library libabc.so using this command:

/usr/local/lib/libabd.so: undefined reference to `xmlXPathNewContext'

I get errors for all the functions I used from the included library libxml2 in the first application and the function which has this undefined reference is actually the library I include in the first program I mean I have tested it.
So kindly anyone guide me where I need corrections.

Answer 1

You may have to pass the path also using -I/path/to/library, or alternatively export it to LD_LIBRARY_PATH.