#20231: Blacklist GCC 4.8.x
-------------------------------------------------+-------------------------
       Reporter:  jdemeyer                       |        Owner:
           Type:  enhancement                    |       Status:  closed
       Priority:  major                          |    Milestone:  sage-7.2
      Component:  build: configure               |   Resolution:  fixed
       Keywords:                                 |    Merged in:
        Authors:  Jeroen Demeyer                 |    Reviewers:  Frédéric
Report Upstream:  N/A                            |  Chapoton
         Branch:                                 |  Work issues:
  37defe3940307cd63a41d3d993715bba0c529c18       |       Commit:
   Dependencies:                                 |     Stopgaps:
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Changes (by embray):

 * commit:  37defe3940307cd63a41d3d993715bba0c529c18 =>


Comment:

 Was this announced in sage-devel?  After rebasing branch I was working in
 on the current develop sage suddenly wants to compile gcc because of this.
 gcc 4.8 is the default version on Ubuntu 14.04 which is the current LTS
 (not counting 16.04 which hasn't quite yet been released).

 It seems extreme to me to blacklist an entire compiler when there's a
 simple workaround (`-fno-tree-dominator-opts`) that can be applied only
 for that version.  As a compromise, perhaps issue a loud warning when the
 workaround is used as it may affect performance, for anyone who cares.  It
 would only need to be enabled for those modules that need it.

--
Ticket URL: <http://trac.sagemath.org/ticket/20231#comment:6>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, 
and MATLAB

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