Installing for non-default python

[markcmiller86]

On LLNL CZ/RZ systems, the default python is still pretty old.

To install for non-default python, here is what I do...

• module load python/x.y.z
  • x.y.z is for example 3.8.2
• It might be necessary to set compiler to whatever version was used to build the python you are using
  • To do this, just run python3 and it will print that information about...

  rztopaz578{miller86}612: python3
  Python 3.8.2 (default, Mar 18 2020, 12:19:58) 
  [GCC 4.9.3] on linux
  Type "help", "copyright", "credits" or "license" for more information.
  

• use env command to run Silo's configure script and set both PYTHON and PYTHON_CPPFLAGS
  • Although we have CMake mostly working for 4.11.1, we have yet to test this for python installs
• Here is command I used recently...

module load python/3.8.2
module load gcc/6.1.0
env PYTHON=python3 \
PYTHON_CPPFLAGS="-I/usr/tce/packages/python/python-3.8.2/include/python3.8" \
../configure --prefix=`pwd`/myinstall \
--enable-pythonmodule \
.
.
.

• To get the specific path you need for PYTHON_CPPFLAGS run python3, import sys and examine sys.path