#13540: Automatically detect and test optional dependencies.
-----------------------------------+----------------------------------------
       Reporter:  robertwb         |         Owner:  mvngu   
           Type:  enhancement      |        Status:  new     
       Priority:  major            |     Milestone:  sage-5.4
      Component:  doctest          |    Resolution:          
       Keywords:                   |   Work issues:          
Report Upstream:  N/A              |     Reviewers:          
        Authors:  Robert Bradshaw  |     Merged in:          
   Dependencies:                   |      Stopgaps:          
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Comment (by jdemeyer):

 Command lines for `gcc`, `g++`, `gfortran` compiling a shared library from
 `/dev/null`:
 {{{
 gcc -shared -fpic -x c /dev/null -o /dev/null
 g++ -shared -fpic -x c++ /dev/null -o /dev/null
 gfortran -cpp -ffree-form -shared -fpic -x f95 /dev/null -o /dev/null
 }}}

 I have no idea how to do any of this with other compilers such as `clang`.

-- 
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13540#comment:5>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, 
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