Embedding Python in C, linking fails with undefined reference to `Py_Initialize'

Question

I am trying to compile the example from the docs https://docs.python.org/2.7/extending/embedding.html and my code looks exactly like the one under 5.1:

#include          


        

Answer 1

Got the same error on WSL, Ubuntu 18.04, Python3.8, g++ 7.5. Thanks to Ciro Santilli comment, adding --embed option to python3.8-config solved unresolved symbols problem, but after that I got the following error:

g++ `python3.8-config --cflags --embed` -o cpython.out cpython.cpp `python3.8-config --ldflags --embed`
lto1: fatal error: bytecode stream in file ‘/home/rpovelik/installed/miniconda3/envs/cython/lib/python3.8/config-3.8-x86_64-linux-gnu/libpython3.8.a’ generated with LTO version 6.0 instead of the expected 6.2
compilation terminated.
lto-wrapper: fatal error: g++ returned 1 exit status
compilation terminated.
/usr/bin/ld: error: lto-wrapper failed
collect2: error: ld returned 1 exit status

I suppose some people are going to face the same issue so I inspected the similar symptoms here where conda people said something like "don't use default compilers - g++ - because it could cause compatibility issues - use conda specific compilers".

By the way, adding -fno-lto solved my problem with system-wide g++ 7.5. Possibly you can try to change version of the compiler.