Requirements File Providing global-option to Incorrect Requirements

[jayfo]

• Pip version: 8.1.2
• Python version: 3.5.0
• Operating System: Travis

Description:

A requirements file containing a --global-option passes that option to requirements other than that on which it was specified. This file will therefore fail:

pyyaml==3.11 --global-option='--without-libyaml'
requests==2.10.0

With the error:

Running setup.py install for requests ... error
    Complete output from command /home/travis/virtualenv/python3.5.0/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-aqgoiffd/requests/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" --without-libyaml install --record /tmp/pip-o_9poof_-record/install-record.txt --single-version-externally-managed --compile --install-headers /home/travis/virtualenv/python3.5.0/include/site/python3.5/requests:
    usage: -c [global_opts] cmd1 [cmd1_opts] [cmd2 [cmd2_opts] ...]
       or: -c --help [cmd1 cmd2 ...]
       or: -c --help-commands
       or: -c cmd --help

    error: option --without-libyaml not recognized

What I've Run:

I have created a small repository to reproduce the error:

https://github.com/jayfo/pip-requirements-bug

The current state of the repository is trivial. I have submitted two pull requests.

The pull which lists the global-option requirement first, as above, fails:

https://github.com/jayfo/pip-requirements-bug/pull/2

Swapping the order is enough in this case, as this passes:

https://github.com/jayfo/pip-requirements-bug/pull/1

[xavfernandez]

Related to #3763