[MacPorts] #35982: qt4-mac & Qt4 portgroup: clang spec for qmake

[MacPorts]

#35982: qt4-mac & Qt4 portgroup: clang spec for qmake
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 Reporter:  mojca.miklavec.lists@…          |       Owner:  macports-tickets@…                   
     Type:  defect                          |      Status:  new                                  
 Priority:  Normal                          |   Milestone:                                       
Component:  ports                           |     Version:                                       
 Keywords:                                  |        Port:  qt4-mac                              
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 This issue came up during inclusion of Goldendict port which currently
 uses:
 {{{
 configure.cmd       ${qt_qmake_cmd}
 configure.pre_args
 configure.universal_args-delete --disable-dependency-tracking

 variant universal {}

 build.args          CC="${configure.cc} [get_canonical_archflags cc]" \
                     CXX="${configure.cxx} [get_canonical_archflags cxx]" \
                     LINK="${configure.cxx} [get_canonical_archflags cxx]"
 \
                     XXXOBJC="${configure.cc} [get_canonical_archflags cc]"
 }}}

 The problem is that {{{${qt_qmake_cmd}}}} from Qt4 portgroup doesn't take
 sufficient care of choosing the desired compiler. qmake can take a spec
 file as an argument (something like {{{qmake -spec macx-llvm}}}) and the
 spec file takes care of setting the compiler and its flags.

 This is the list of currently installed spec files:
 {{{
 /opt/local/share/qt4/mkspecs/macx-g++/qmake.conf
 /opt/local/share/qt4/mkspecs/macx-g++40/qmake.conf
 /opt/local/share/qt4/mkspecs/macx-g++42/qmake.conf
 /opt/local/share/qt4/mkspecs/macx-icc/qmake.conf
 /opt/local/share/qt4/mkspecs/macx-llvm/qmake.conf
 /opt/local/share/qt4/mkspecs/macx-pbuilder/qmake.conf
 /opt/local/share/qt4/mkspecs/macx-xcode/qmake.conf
 /opt/local/share/qt4/mkspecs/macx-xlc/qmake.conf
 }}}
 I actually miss {{{macx-clang}}} spec being present upstream, but even
 then I'm not absolutely sure if this would cover all the cases. Most
 probably there is some further tweaking needed to convince qmake to work
 as desired (choose the right compiler and flags, possibly handling
 universal builds as well).

-- 
Ticket URL: <https://trac.macports.org/ticket/35982>
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