Import Error: Undefined Symbol

[CyclingNinja]

Sorry for the spam, but this is all very new to me and I've had a few days of misdiagnosis of the issue.

when running my code, it compiles just fine using python setup.py etc.

However when importing the results into python I get that error and my variables names are 'Mangled' as I believe the technical term is and look like this:

0000000000007ab8 r _ZL12__pyx_k_main
0000000000007aaf r _ZL12__pyx_k_test
000000000020a160 b _ZL12__pyx_lineno
000000000020a000 b _ZL12__pyx_n_s_np
0000000000209fc0 b _ZL12__pyx_n_s_pd
0000000000209f28 b _ZL12__pyx_tuple_
000000000020a150 b _ZL13__pyx_clineno

instead of this

0000000000007ab8 r __pyx_k_main
0000000000007aaf r __pyx_k_test
000000000020a160 b __pyx_lineno
000000000020a000 b __pyx_n_s_np
0000000000209fc0 b __pyx_n_s_pd
0000000000209f28 b __pyx_tuple_
000000000020a150 b __pyx_clineno


At first I thought it was because the structure was pointing in a different place, however, changing that method did not help.
Having googled around, I've ruled out clashing names of files but that about it.

I can demangle them using nm -C as I found on the interwebs, but I do not know how to implement this into the code to fix it as it builds, my set up file currently looks like

ext_modules = cythonize("cyfile.pyx",
                        sources=['cfile.cpp'],
                        libraries=['stdc++'],
                        language="c++"
                        )

setup(
    name="cyModule",
    ext_modules=ext_modules,
    include_dirs=[numpy.get_include()]
)

And I'm wondering if I need to include the nm library, whatever that is...

Again, sorry for the spam, however you are my only hope at this stage, thank you

[Robert Bradshaw]

This looks like a C vs. C++ issue, but without aN example it's hard to
diagnose exactly what is off in your setup.

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[Samuel M Bennett]

Yes I apologise for that, I'm currently working at braking a better example to show exactly what exactly is happening.

It would make sense that its c vs cpp. I've only been fumbling around so far and I've been defining functions in .cpp but only creating a .h header, which could be the cause.

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[CyclingNinja]

So I was being an idiot, I was missing the

# distutils: language = c++
# distutils: sources = RoadDensityPyMod.cpp

in the .pyx, your suggestion was enough to guide me into the right place.

Thanks to all of you who helped, this has been a gratifyingly steep learning curve