[MacPorts] #46305: p5-pdl: plplot fails to configure, disabled by default

[MacPorts]

#46305: p5-pdl: plplot fails to configure, disabled by default
----------------------+-----------------------
 Reporter:  devans@…  |      Owner:  mgrimes@…
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:            |       Port:  p5-pdl
----------------------+-----------------------
 In spite of the dependency on plplot, p5-pdl fails to configure plplot
 graphics support.  Investigation shows that this option is explicitly
 disabled by default in ${worksrcpath}/perldl.conf

 Default setting in perldl.conf (in spite of the comment, 0 -> disable, 1
 -> enable, undef -> auto):
 {{{
 # default settings (let PDL build decide whether to build PLPLOT)
 #
         WITH_PLPLOT          => 0,     # Leave it up to PDL to decide
         WHERE_PLPLOT_LIBS    => undef, # let PDL search for plplot
 installation
         WHERE_PLPLOT_INCLUDE => undef, # let PDL search for plplot
 installation
 }}}

 Result during configuration

 {{{
 :info:configure User requested no PLplot interface!
 :info:configure       Not building PDL::Graphics::PLplot

 :info:configure Checking PDL::Graphics::PLplot...
 :info:configure found_plplot is 0
 :info:configure writing dummy Makefile

 }}}

 If perldl.conf is edited to allow auto configuration
 {{{
 # default settings (let PDL build decide whether to build PLPLOT)
 #
         WITH_PLPLOT          => undef, # Leave it up to PDL to decide
         WHERE_PLPLOT_LIBS    => undef, # let PDL search for plplot
 installation
         WHERE_PLPLOT_INCLUDE => undef, # let PDL search for plplot
 installation
 }}}

 configuration succeeds as follows
 {{{
 :info:configure Checking PDL::Graphics::PLplot...
 :info:configure found_plplot is 1
 :info:configure         Succeeded linking PLplot with -L/opt/local/lib
 -lplplotd -lX11
 :info:configure         plsmem function found, in-memory plotting
 available!
 :info:configure         plsvect function found, vector plotting available!
 :info:configure         c_plgcoloa function found, alpha transparency
 available!
 :info:configure         c_plseed function found, random numbers available!
 :info:configure         c_plsfont function found, set font available!
 :info:configure         c_plimagefr function found, 2d matrix available!
 :info:configure         c_pllegend function found, Plot legends available!
 :info:configure Generating a Unix-style Makefile
 :info:configure Writing Makefile for PDL::Graphics::PLplot
 }}}

 Comments in ${worksrcpath}/Changes indicate that, at least on Windows,
 plplot integrated support does not build correctly. Workaround is to
 install PDL first and then install PDL::Graphics::PLplot which, indeed, is
 packaged as a [http://search.cpan.org/~dhunt/PDL-Graphics-PLplot-0.67/
 separate module] as well.  This isn't well documented so I'm not sure
 which approach is preferred.

 Possible solutions:
   * leave perldl.conf as is (plplot disabled), remove the dependency on
 plplot and reply on a separate p5-pdl-graphics-plplot port (not yet
 ported) to acheive this support
   * patch perldl.conf to enable plplot and keep plplot dependency
   * create a variant +plplot that enables plplot when selected

-- 
Ticket URL: <https://trac.macports.org/ticket/46305>
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