Cython raw string literal broken example

cythonize.py

from Cython.Compiler import Options
Options.annotate = True
Options.fast_fail = True

from Cython.Build import cythonize

cythonize(["main.pyx"], language='c++')

main.pyx

from mypxd cimport (
    myInt
)

print(myInt)

mypxd.pxd

# This one works.
# cdef extern from ".\\util.h":

# This one doesn't.
cdef extern from r".\util.h":
    const unsigned myInt

util.h

const unsigned myInt = 32768;

This fails for the command: python cythonize.py
[where python is python.exe from python36 install directory]

But works for the equivalent command: cython -a --cplus -3 --fast-fail main.pyx
[where cython is cython.exe from python36 scripts directory]

The two commands are actually not equivalent because you are not enabling Py3 mode in the first. Shouldn't make a difference here, though...

Nice catch. That was the problem.
Adding #cython: language_level=3 to the pxd file solved it.
Thanks!