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

[Einstein Toolkit]

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

Comment (by eschnett):

 ExternalLibraries/GSL rebuilds a library whenever (a) the GSL thorn
 changes, or (b) the file configs/*/scratch/done/GSL is missing, e.g. after
 a make *-clean. The location of GSL_INSTALL_DIR does not factor into this
 decision at all! In particular:

 - If two Cactus configurations use the same install locations, then the
 library there will be built twice -- the first will silently be
 overwritten
 - If you clean a configuration or remove it, and then rebuild it, the GSL
 library will be built again, even if it already exists there
 - If you install GSL into the Cactus source tree, the same thing happens.

 You can easily see this in the build script. The test whether to build is
 done before GSL_INSTALL_DIR is checked.

-- 
Ticket URL: <https://trac.einsteintoolkit.org/ticket/136#comment:22>
Einstein Toolkit <http://einsteintoolkit.org>
The Einstein Toolkit