#13415: Prevent unneeded rebuilding when upgrading
---------------------------+------------------------------------------------
   Reporter:  jdemeyer     |             Owner:  GeorgSWeber
       Type:  enhancement  |            Status:  new        
   Priority:  major        |         Milestone:  sage-5.4   
  Component:  build        |          Keywords:             
Work issues:               |   Report Upstream:  N/A        
  Reviewers:               |           Authors:             
  Merged in:               |      Dependencies:  #13395     
   Stopgaps:               |  
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 Since (almost) every package depends on `patch` and `bzip2`, an update of
 either of these packages causes a rebuild of everything when upgrading.

 An update of `prereq` even causes everything to be built twice(!) when
 upgrading (the new prereq script is only seen after the new root repo is
 installed, so the second `sage-upgrade` run for double-checking when
 install the new prereq and therefore rebuild everything).

 We should simply remove dependencies of packages on `PREREQ`, `BZIP2` and
 `PATCH` and build those packages separately.

-- 
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13415>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, 
and MATLAB

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