R. David Murray added the comment:

make touch avoids rebuilding "pgen and stuff", and just uses what was checked 
out or provided in the tarball.  The release tarballs are supposed to have the 
time stamps in the correct order so that the compiletime/boostrapping utilities 
don't get built/rebuilt.

So for cross compilation, you should be able to use the existing files to build 
the target python.  If you then also want pgen *on the target*, you will need 
to build it for the target.  Like I said, I don't have much experience with 
this stuff, but if I understand correctly, you only really the utilities if you 
want to be able to do development *of python* on the target.

So, if running make in cross-compile "mode" (whatever that looks like, I have 
no clue) tries to rebuild pgen in your scenario, then *that* is what needs to 
be fixed, I think.

Of course, I could be completely wrong, which is why I've been pretty tentative 
about handing out advice :)

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue19142>
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