[MacPorts] #66006: Boost universal variant broken for GCC

[MacPorts]

#66006: Boost universal variant broken for GCC
-------------------------------------+----------------------
 Reporter:  barracuda156             |      Owner:  mascguy
     Type:  defect                   |     Status:  assigned
 Priority:  Normal                   |  Milestone:
Component:  ports                    |    Version:
 Keywords:  powerpc, leopard, ppc64  |       Port:  boost
-------------------------------------+----------------------
 The current realization of universal variant of Boost is broken with GCC.
 Since it requires newer GCC than Apple, `muniversal` PG has to be used (at
 least for GCC builds). However even adding PG does not help, single
 configure done (for ppc), and double archs are passed on command line,
 which obviously cannot work. Like this:
 {{{
     "/opt/local/bin/g++-mp-11"   -fvisibility-inlines-hidden -Os
 -std=gnu++11 -D_GLIBCXX_USE_CXX11_ABI=0 -arch ppc -arch ppc64  -fPIC -O3
 -Wall -fvisibility=hidden -dynamic -gdwarf-2 -fexceptions -Wno-inline
 -ftemplate-depth-255 -fvisibility=hidden -fvisibility-inlines-hidden
 -DBOOST_ALL_NO_LIB=1 -DBOOST_SERIALIZATION_DYN_LINK=1 -DNDEBUG  -I"."  -c
 -o "bin.v2/libs/serialization/build/darwin-11.3.0/release/address-model-
 32_64/pch-off/threading-multi/visibility-hidden/basic_iarchive.o"
 "libs/serialization/src/basic_iarchive.cpp"

 g++-mp-11: warning: ppc64 conflicts with ppc (arch flags ignored)
 }}}

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Ticket URL: <https://trac.macports.org/ticket/66006>
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