[ET Trac] [Einstein Toolkit] #1817: Update LORENE library

[Einstein Toolkit]

#1817: Update LORENE library
------------------------------------+---------------------------------------
  Reporter:  knarf                  |       Owner:                     
      Type:  enhancement            |      Status:  review             
  Priority:  minor                  |   Milestone:  ET_2017_05         
 Component:  EinsteinToolkit thorn  |     Version:  development version
Resolution:                         |    Keywords:                     
------------------------------------+---------------------------------------

Comment (by knarf):

 > Does the LORENE C++ API also change?

 Yes. The updated version, e.g., uses namespaces for at least part of the
 code. The old didn't. But it quite likely also does not use them for
 everything, so you do not want both versions compiled into the same
 binary.

 > Ideally it should be able to compile both LORENE and LORENE2 into the
 same executable.

 I agree. Unfortunately, this seems to be a bad choice in this case.

 > If not possible then one could at least try that one at least receives
 an error before the final link stage

 Both providing the same implementation (but different versions) would do
 exactly that. Cactus does not allow two identical implementations. This
 would be caught already at CST stage.

 It is already sub-optimal to provide two different versions of otherwise
 the same library. I don't want to introduce a new implementation name for
 every potentially new version of Lorene. I would strongly prefer the same
 implementation name, and use versions to make sure that thorns using
 Lorene within Cactus get the versions they actually work with.

-- 
Ticket URL: <https://trac.einsteintoolkit.org/ticket/1817#comment:12>
Einstein Toolkit <http://einsteintoolkit.org>
The Einstein Toolkit