swig Cmake linker problem

Hello,

I am trying to compile and linke a simple Python wrapper with Swig and CMake.

The example repo is this:

https://gitlab.com/bitdiver/geometrics/-/tree/swig

However, when I try to link the geomod module I get:

geometrics/build> ninja all

[0/1] Re-running CMake...

-- Configuring done

-- Generating done

-- Build files have been written to: /home/pmu/projects/graphics/geometrics/build

[2/2] Linking CXX shared module src/_geomod.so

FAILED: src/_geomod.so

: && /usr/bin/c++ -fPIC -shared -o src/_geomod.so src/CMakeFiles/geomod.dir/CMakeFiles/geomod.dir/geometryPYTHON_wrap.cxx.o /usr/lib64/libpython3.6m.so /usr/local/lib/libPNGwriter.a src/libgeometry.a /usr/local/lib/libPNGwriter.a /usr/lib64/libpng.so /usr/lib64/libz.so -lm /usr/lib64/libfreetype.so && :

/usr/lib64/gcc/x86_64-suse-linux/7/../../../../x86_64-suse-linux/bin/ld: src/libgeometry.a(geometry.cc.o): relocation R_X86_64_PC32 against symbol `_ZN9pngwriter4lineEiiiiiii' can not be used when making a shared object; recompile with -fPIC

/usr/lib64/gcc/x86_64-suse-linux/7/../../../../x86_64-suse-linux/bin/ld: /usr/local/lib/libPNGwriter.a(pngwriter.cc.o): relocation R_X86_64_32 against `.rodata.str1.8' can not be used when making a shared object; recompile with -fPIC

/usr/lib64/gcc/x86_64-suse-linux/7/../../../../x86_64-suse-linux/bin/ld: final link failed: nonrepresentable section on output

collect2: error: ld returned 1 exit status

ninja: build stopped: subcommand failed.

Do you see if I miss a compiler flag?

Or is something wrong with my Swig module file:

%module geomod

%include "stdint.i"

%include "std_string.i"

// Add necessary symbols to generated header

%{

#include <geometry.hh>

int draw_line(std::string fname, int x0, int y0, int x1, int y1);

%}

int draw_line(std::string fname, int x0, int y0, int x1, int y1);

//%include "../geometry.hh"

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