Dave Abrahams <d...@boostpro.com> added the comment:

@r.david.murray: did you try running my test?  I think it shows that we are 
pretty darned close to fully portable.  I believe we could fix Popen to make it 
fully portable pretty easily.  In fact, there may be a pure-python fix.  
Documenting the differences would also not be hard.  I would discourage you 
from relying *solely* on a description such as "uses execvpe on POSIX" to 
describe the semantics.  Aside from being a nonportable description, it doesn't 
help anyone who isn't familiar with the POSIX system calls.

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<http://bugs.python.org/issue8557>
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