[Cython] Cython fails to build if pgen is available

[Dominic Sacré]

Hi,

I'm getting the following error trying to build Cython 0.23:

Cython/Parser/Grammar: No such file or directory
Traceback (most recent call last):
  File "setup.py", line 289, in <module>
    compile_cython_modules(cython_profile, cython_compile_more,
cython_with_refnanny)
  File "setup.py", line 135, in compile_cython_modules
    os.path.join(parser_dir, 'graminit.c'),
  File
"/data/master/build/tmp/sysroots/x86_64-linux/usr/lib/python2.7/subprocess.py",
line 540, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command
'['/data/master/build/tmp/sysroots/x86_64-linux/usr/bin/python-native/pgen',
'Cython/Parser/Grammar', 'Cython/Parser/graminit.h',
'Cython/Parser/graminit.c']' returned non-zero exit status 1

The toolchain is based on OpenEmbedded, and unlike most distribution
packages, its Python installation actually contains pgen.

Where would that Cython/Parser/Grammar file come from?
Alternatively, is there a clean way (without patching setup.py) to skip
compiling the grammar?


Cheers,

Dominic