Barry Smith a714377123 python: PYTHONHOME may not be the same as the prefix of the python executable (#2173) ... On MacOS, brew installs /usr/local/bin/python but the Python prefix is not /usr/local/bin Use the python command sys.exec to get the correct directory, instead of the ad hoc self.prefix previously used This was a bear to debug; been driving me nuts since I started using spack. Since spack passes PYTHONHOME down to package builds in the environment it was passing PYTHONHOME of /usr/local/bin to the PETSc build that uses Python so the PETSc Python ./configure errored immediately with ImportError: No module named site since python could find no python modules. Todd Gamblin pointed out that my first try to fix this was wrong since it assumed the spack python was the same python used to run spack. Elizabeth Fischer suggested how to get it to work also with python3 Funded-by: IDEAS Project: IDEAS/xSDK Time: 7 hours Thanks-to: Todd Gamblin, Elizabeth Fischer		2016-10-30 17:13:16 -07:00
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spack	python: PYTHONHOME may not be the same as the prefix of the python executable (#2173)	2016-10-30 17:13:16 -07:00