Swig'ed DLL not found in Windows with CMake

Hello,

I am trying to build a Python module with help of Swig on Windows and CMake.
The example I am following is similar to the LAMMPS swig interface here:

https://github.com/ymishin-gmu/LAMMPS-USER-PINN/blob/8c56ef94570325fc660819e4f123376515e8fba3/tools/swig/CMakeLists.txt

swig_add_library(mymod
                TYPE MODULE
                LANGUAGE python
                SOURCES swig/mymod.i formats/import.cc
                )

Then I link the lib with:

swig_link_libraries(mymod Python3::Python  ${Boost_FILESYSTEM}
${Boost_SERIALIZATION_LIBRARY}  )


The build looks good but I am not sure if I should see a .dll which
can be loaded.


When I try to import the lib I get:


(base) C:\CLionProjects\mymod\cmake-build-debug\lib>python
Python 3.9.5 (default, May 18 2021, 14:42:02) [MSC v.1916 64 bit
(AMD64)] :: Anaconda, Inc. on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import mymod
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "...lib\mymod.py", line 15, in <module>
    import _mymod
ImportError: DLL load failed while importing _mymod: %1 is not a valid
Win32 application.


What can be done to debug this?

I see a .pyd file , is it enough, or should there be .dll ?

How to check the library has the the right format?

Maybe it is the Python interpreter (Anaconda) vs. the interpreter I
use to build the package (from vcpkg) ?

Thanks a lot for your help!

Patrick

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