Allow Sharing C++ Classes Across Modules · Issue #4561 - GitHub

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I have these files to reproduce the problem, mod2.pxd:

cdef void myapi() cdef cppclass myclass: void mymethod()

mod2.pyx

cdef void myapi(): print("I am OK (from myapi)") cdef cppclass myclass: void mymethod(): # Using anything C is OK cdef int i = 0 i += 1 # Crash with Python var # Segmentation fault j = 0 j += 1 # Crash with Python function # Segmentation fault print("I am crashing!")

mod1.pxd

cdef void myfunc()

mod1.pyx

from mod2 cimport myapi, myclass cdef cppclass foo: void bar(): print("I am OK (from foo.bar)") cdef void myfunc(): print("I am OK") myapi() cdef foo f f.bar() # Stack var: Segmentation fault print("Calling myclass.mymethod...") cdef myclass t t.mymethod() # # Pointer: Segmentation fault # print("Calling myclass.mymethod...") # cdef myclass* t2 = new myclass() # t2.mymethod() cpdef test(): myfunc()

Main Python programme app.py

import mod1 mod1.test()

It's a segmentation fault which happens in a Cython struct myclass when using anything Python. Also in mod2, but the global function myapi is OK. From a struct method foo.bar but in the same file is also OK.

I'm using Python 3.8.2, and Cython 0.29.26

mod1 and mod2 are translated into C++ with cython -3 --cplus command, and compiled with gcc to .so files. It happened the same if using Python build tool. As suggested from https://stackoverflow.com/a/55669343/5581893 I tried to add -DCYTHON_PEP489_MULTI_PHASE_INIT=0 to all gcc commands but no help.

This situation seems strange, why are Python stuff not touch-able from mod2 (fails in struct only)?

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