Python Ctypes And Dynamic Linking

I'm writing some libraries in C which contain functions that I want to call from Python via ctypes. I've done this successfully another library, but that library had only very vani

Solution 1:

OK, thanks for your help.

to get this to work I had to include the dependencies when linking (duh). I had tried this before but got an error, so solve this I had to recompile fftw with '-fpic' as a CPP flag. all works now.

icpc -Wall -fPIC -c waveprop.cpp -o libwaveprop.o $std_link
icpc -shared -Wl,-soname,libwaveprop.so.1 -o libwaveprop.so.1.0 libwaveprop.o -lfftw3

cp waveprop.so.1.0 /usr/local/lib/
rm waveprop.so.1.0
ln -sf /usr/local/lib/waveprop.so.1.0 /usr/local/lib/waveprop.so
ln -sf /usr/local/lib/waveprop.so.1.0 /usr/local/lib/waveprop.so.1

thanks, -nick

Solution 2:

You need to link libwaveprop.so itself against the fftw3 library. Otherwise Python simply won't know where to go to get those missing symbols; mind-reading isn't implemented in any programming language.