CODEWITHSUNDEEP
pythoncmakeswig
Fred
Fred

Reputation: 5

Why does cmake on windows specify duplicate SWIG python language indications?

I'm successfully building a SWIG interface between python and my C++ library on Linux using cmake. (well, except on linux an extra _ is added at the beginning of the module name).

However, on windows, the build fails with "Only one target language can be supported at a time (both -python and -python were specified)." My SWIG_ADD_LIBRARY call is straight forward:

SWIG_ADD_LIBRARY(pyIntegration TYPE SHARED LANGUAGE PYTHON SOURCES example.i example.h, etc )

My .i file is not very exciting, just a module specification as : %module pyIntegration

and some typedefs (e.g. unsigned int uint32_t, etc).

Any thoughts? Seems like a cmake bug most likely, but how best to work around? Thanks so much for any assistance!

Upvotes: 0

Views: 26

Answers (2)

Fred
Fred

Reputation: 5

ok, egg on my face - I found the problem. When I converted the CMakeLists.txt file, I modified a set property that had previously set the tcl version to tcl8 to instead specify -python - which then was duplicated by cmake. Sorry for the distraction!

Upvotes: 1

Mizux
Mizux

Reputation: 9309

Please provide:

  • the CMake version use since the UseSWIG builtin module has got some rework in 3.19 IIRC
  • The swig(win) you've installed on your system (FYI 4.3.0 is the last release)

Did you set some property on the example.i file ?

It should be:

set_property(SOURCE example.i PROPERTY CPLUSPLUS ON)
swig_add_library(pyIntegration LANGUAGE python SOURCES example.i)

ref: https://cmake.org/cmake/help/latest/module/UseSWIG.html

ps: you can find a working sample here: https://github.com/Mizux/python-native
pps: Swigwin manual install: https://github.com/Mizux/python-native/blob/0f3f49a0db49553ad6ffbb0fb59451e28a9f811c/.github/workflows/amd64_windows.yml#L29-L33
or from CMakeList.txt https://github.com/google/or-tools/blob/98129bd1fa6ab0d40be6bb08a74bbbc21af5ba25/cmake/dependencies/CMakeLists.txt#L17-L47

Upvotes: 0

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