[ET Trac] [Einstein Toolkit] #136: Don't rebuild external libraries so often

[Einstein Toolkit]

#136: Don't rebuild external libraries so often
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  Reporter:  eschnett     |       Owner:        
      Type:  enhancement  |      Status:  review
  Priority:  minor        |   Milestone:        
 Component:  Cactus       |     Version:        
Resolution:               |    Keywords:        
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Comment (by eschnett):

 The advantage of a configuration option over an environment variable is
 that one can have two different install dirs e.g. on Kraken, e.g. if one
 wants to experiment with using the Intel vs. the PGI compiler. The
 respective libraries would be incompatible.

 The idea behind declaring these options in a .ccl file is that, at one
 point, we may/should/could clean up the configuration mechanism to ensure
 that only intended variables are passed to the configuration scripts. For
 example, I found a system that had the R package installed, and had an
 environment variable RPATH set; RPATH is also a configuration option for
 (HDF?), which then breaks many things.

 Again: what do others think?

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/136#comment:13>
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