[issue28114] parse_envlist(): os.execve(), os.spawnve(), etc. crash in Python 3.6.0 when env contains byte strings

[Steve Dower]

Steve Dower added the comment:

We already use HAVE_WEXECV and HAVE_WSPAWNV elsewhere to choose the wide-char versions of these functions. You've got a few changes to make if you want to maintain consistency.

Personally I prefer feature flags to platform flags, then let pyconfig.h control them, especially when we're not directly using platform-specific APIs.

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<http://bugs.python.org/issue28114>
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