[MacPorts] #37732: cmake portgroup needs an option to disable use of CMAKE_OSX_ARCHITECTURES

[MacPorts]

#37732: cmake portgroup needs an option to disable use of  CMAKE_OSX_ARCHITECTURES
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  Reporter:  mojca@…  |      Owner:  macports-tickets@…
      Type:  defect   |     Status:  reopened
  Priority:  High     |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:           |
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Comment (by rjvbertin@…):

 Replying to [comment:14 mojca@…]:
 > The CMake developers have confirmed the bug but aren't likely to act on
 it any time soon. CMake simply applies the flag to any given compiler on
 Mac OS X when CMAKE_OSX_ARCHITECTURES is present:
 http://thread.gmane.org/gmane.comp.programming.tools.cmake.devel/5876.

 Is the location in the CMake source code (or the core .cmake files) where
 this happens identified? IIUC correcting the issue would require adding a
 list of compilers that don't understand the -arch flag, and take
 appropriate action for those?

 Alternatively, how about replacing `-arch i386` with `-m32` and `-arch
 x86_64` with `-m64` for GCC compilers, on OS X versions where clang is the
 default (10.7 and higher)?

 The original comment states
 > It seems that one can use -m32 with both to get 32-bit i386 binaries,
 but I cannot try it out without recompiling gcc with +universal and I
 don't know yet how to make universal binaries with that approach.

 is that because of (runtime) libraries that must be present in 32bit
 version?

-- 
Ticket URL: <https://trac.macports.org/ticket/37732#comment:23>
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