[Chapel Merge] Fall back on pip3 if CHPL_PIP doesn't match major

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Branch: refs/heads/master
Revision: 6468acd
Author: mppf
Log Message:

Merge pull request #16616 from mppf/check-pip-python-major-version

Fall back on pip3 if CHPL_PIP doesn’t match major Python vers

We are having problems in certain testing configurations that set
CHPL_PIP to a Python 2 version of pip. We plan to adjust these testing
configurations to not do that but that is taking some time. In the
meantime, this PR adjusts the Makefile logic setting the PIP variable
from CHPL_PIP to run a Python script to check the provided value of
CHPL_PIP. If the provided CHPL_PIP is for a different major version
of Python, fall back on pip3.

  • [x] python3 third-party/chpl-venv/find-pip.py pip3 behaves as
    expected (returns pip3)
  • [x] python3 third-party/chpl-venv/find-pip.py pip2 behaves as
    expected (returns pip3)
  • [x] make docs works in a weird CHPL_PIP setup
  • [x] make docs works on a linux system

Reviewed by @lydia-duncan - thanks!

Modified Files:
A third-party/chpl-venv/find-pip.py
M third-party/chpl-venv/Makefile
M third-party/chpl-venv/Makefile.include

Compare: https://github.com/chapel-lang/chapel/compare/6dfa331f1e9e...6468acdcbcb8