[MacPorts] #34231: ImageMagick: should not depend on pango + fix openMP

[MacPorts]

#34231: ImageMagick: should not depend on pango + fix openMP
---------------------------------------+------------------------------------
 Reporter:  frederic.devernay@…        |       Owner:  ryandesign@…           
     Type:  defect                     |      Status:  new                    
 Priority:  Normal                     |   Milestone:                         
Component:  ports                      |     Version:  2.0.4                  
 Keywords:  haspatch                   |        Port:  ImageMagick            
---------------------------------------+------------------------------------

Comment(by ryandesign@…):

 Thank you for the additional information. While I do of course want to "do
 the right thing" (or the best thing) by default, users have requested the
 ability to turn openmp support on when it was off by default (#15945) or
 off when it was on by default (#24944). These users apparently feel there
 is value to being able to select this, so I would like to accommodate
 their wishes, just as I would like to accommodate the wishes you've
 expressed in this ticket. Although you say "IM doesn't really benefit from
 using OpenMP", clearly the developers of ImageMagick must disagree with
 you or else they wouldn't have added OpenMP support to ImageMagick, so I
 am trying to come up with a solution that gives users the choice if
 possible.

 It's not really important that later versions of gcc would work with
 openmp, since there is no supported circumstance in which ImageMagick
 would ever be compiled with a later version of gcc in MacPorts. The only
 compilers ImageMagick might be compiled with today are the ones that come
 with Xcode; by default those are: gcc 4.0 on Tiger and Leopard, gcc 4.2 on
 Snow Leopard with Xcode 3, llvm-gcc-4.2 on Xcode 4.0 and 4.1, and clang on
 Xcode 4.2 and up.

 I was not suggesting that we should allow users to compile ImageMagick
 with gcc and with openmp on. Rather, I was suggesting that Xcode 3 and up
 includes versions of llvm-gcc-4.2 and clang. Although the default compiler
 for Xcode 3 is a version of gcc, we could set ImageMagick to compile with
 llvm-gcc-4.2 or clang instead, thereby allowing openmp to function
 properly. Assuming the old versions of llvm-gcc-4.2 or clang in Xcode 3
 work well enough to compile ImageMagick at all, we could either switch the
 compiler unconditionally, or conditionally only when openmp support is
 requested. If necessary we could even make ImageMagick install the
 clang-3.0 port and use that to compile ImageMagick, though since that's a
 rather heavy dependency it would be best to avoid that if possible.

-- 
Ticket URL: <https://trac.macports.org/ticket/34231#comment:5>
MacPorts <http://www.macports.org/>
Ports system for Mac OS