BUG: cannot easily override a cython Include

[mattip]

I am trying to vendor numpy.pxd (or numpy/__init__.pxd) into numpy. It seems the file in Includes/numpy/__init__.pxd is seen before mine when I try cimport numpy.

To reproduce: copy the __init__.pxd from Includes/numpy into site-packages/numpy, and add garbage in the original file so using it will crash cython (I used xxxx = xxxxxxxxx). Then build a project that calls cimport numpy such as pandas. If the copy is found, cythonize will succeed. If the original version is found, cythonize will crash.

I am willing to work on a PR, but need some direction as to where to look for the problem.

[mattip]

I think the problem is that Includes is appended to the search path here, then later on sys.path is optionally appended to the search path here. IMO if sys_path is True the precedence should be

• user provided include_directories
• sys.path
• Includes

instead of the current situation which gives precedence to Includes

[scoder]

I agree about the import path order. sys.path and Includes/ should be reversed.

[scoder]

PR welcome.