macports 2.0.4 breaks the usage of clang on Xcode 4.3.2

[Jack Howarth]

On Sun, Apr 08, 2012 at 12:48:14PM -0400, Jeremy Lavergne wrote:
> > The fact that, on Lion, MacPorts 2.0.4 installs perl/python that defaults to llvm-gcc-4.2 made me
> > suspect that the binary packages installed on Lion were built with SL. If not, this brings up the
> > question of why the Lion build bots are on such an old Xcode that they don't default all of the
> > package builds to clang. Perhaps they should be updated to Xcode 4.3.2 and a bulk rebuild of the
> > MacPorts package set started.
> 
> Pretty sure we just started running the first builds on the Lion buildbot this weekend.
> 
> I don't know their configurations, but it's entirely possible that it has a non-current Xcode. wms is doing pretty much all the work on setting up the buildbots. Maybe we can get a wiki page setup with the configuration information for each buildbot.
> 

I am also having trouble getting the compiler variants in pymol to work under macports 2.0.4.
Using...

sudo port -d install pymol +gcc45

still builds pymol against clang locally. Also non-sensical values like...

sudo port -d install pymol +gcc49

don't produce an error. Is that expected behavior for the error to be
silently ignored by port?
           Jack
ps I am trying to test a pymol build against llvm-gcc-4.2 (with everything else built
with clang as expected). Changing...

--- Portfile.orig	2012-04-08 15:10:54.000000000 -0400
+++ Portfile	2012-04-08 15:28:08.000000000 -0400
@@ -6,6 +6,7 @@
 
 name                pymol
 version             1.5
+revision            1
 categories          science
 maintainers         bromo.med.uc.edu:howarth
 description         Molecular graphics system
@@ -20,7 +21,7 @@
 master_sites        sourceforge
 fetch.type          svn
 svn.url             https://pymol.svn.sourceforge.net/svnroot/pymol/trunk/pymol
-svn.revision        3983
+svn.revision        3996
 worksrcdir          pymol
 
 depends_lib         port:freetype port:libpng port:python26 port:py26-pmw port:py26-numpy port:py26-scipy port:mesa port:glew port:py26-tkinter port:freeglut
@@ -61,7 +62,9 @@
 }
 
 pre-build {
-    build.env CC="${configure.cc}" CXX="${configure.cxx}"
+#    build.env CC="${configure.cc}" CXX="${configure.cxx}"
+    python.add_archflags   no
+    build.env CC="llvm-gcc-4.2" CXX="llvm-g++-4.2"
 }
 
 build {

doesn't cause llvm-gcc-4.2 to be used nor does any of the gcc4x variants work.