[SCons] Ensure paths use posix-style separators

[ischoegl]

Changes proposed in this pull request

Ensure that paths use posix-style separators on all platforms. The post-install message becomes

*************** Cantera 3.0.0a2 has been successfully installed ****************

File locations:

  library files               C:/Users/ischo/miniconda3/envs/cantera-dev/Library/lib
  C++ headers                 C:/Users/ischo/miniconda3/envs/cantera-dev/Library/include
  samples                     C:/Users/ischo/miniconda3/envs/cantera-dev/share/cantera/samples
  data files                  C:/Users/ischo/miniconda3/envs/cantera-dev/share/cantera/data
  input file converters       C:/Users/ischo/miniconda3/envs/cantera-dev/Scripts
  Python package              C:/Users/ischo/miniconda3/envs/cantera-dev/Lib/site-packages
  Python examples             C:/Users/ischo/miniconda3/envs/cantera-dev/share/cantera/samples/python
  Matlab toolbox              C:/Users/ischo/miniconda3/envs/cantera-dev/share/cantera/matlab/toolbox
  Matlab samples              C:/Users/ischo/miniconda3/envs/cantera-dev/share/cantera/samples/matlab

An m-file to set the correct matlab path for Cantera is at:

  C:/Users/ischo/miniconda3/envs/cantera-dev/share/cantera/matlab/toolbox/ctpath.m

********************************************************************************

If applicable, fill in the issue number this pull request is fixing

Closes #1374

Checklist

• The pull request includes a clear description of this code change
• Commit messages have short titles and reference relevant issues
• Build passes (scons build & scons test) and unit tests address code coverage
• Style & formatting of contributed code follows contributing guidelines
• The pull request is ready for review

[bryanwweber]

Thanks! The only concern I have is for the Python package, see https://stackoverflow.com/a/31736631/2449192. I don't think we use PYTHONUSERBASE any more though?

[ischoegl]

Thanks! The only concern I have is for the Python package, see https://stackoverflow.com/a/31736631/2449192.

My impression that all of this is handled by pip at this point, and it appears to be doing the right thing. You are probably a lot more knowledgeable on this than most.

I don't think we use PYTHONUSERBASE any more though?

I searched through the code, and there is no mention of PYTHONUSERBASE. Of course, it could be that SCons is picking up on that when set - but as we're not assigning it with forward slashes, it shouldn't be an issue?

[bryanwweber]

Thanks, LGTM!