Using CMake with setup.py

Question

For a project I build a C library and implict Python bindings (via GObject introspection) with CMake. I also want to distribute some Python helper modules using distutils. I am

Answer 1

Only files, not directories, can be reliably used as OUTPUT and DEPENDS. You could modify your custom command to also produce a timestamp file, something like this:

add_custom_command(
  OUTPUT ${OUTPUT}/timestamp
  COMMAND ${PYTHON} setup.py build
  COMMAND ${CMAKE_COMMAND} -E touch ${OUTPUT}/timestamp
  DEPENDS ${DEPS}
)

add_custom_target(target ALL DEPENDS ${OUTPUT}/timestamp)