I have a fresh install of macports (new computer).  
I see that:  perl5.12                       5.12.4_1 < 5.12.4_2 

I just tried to do an upgrade.  But it fails with these errors at the end of 
the log file:

:info:build /usr/bin/clang -L/opt/local/lib -arch x86_64 -arch i386 
-fstack-protector -force_flat_namespace -o miniperl \
:info:build           gv.o toke.o perly.o pad.o regcomp.o dump.o util.o mg.o 
reentr.o mro.o hv.o av.o run.o pp_hot.o sv.o pp.o scope.o pp_ctl.o pp_sys.o 
doop.o doio.o regexec.o utf8.o taint.o deb.o universal.o globals.o perlio.o 
perlapi.o numeric.o mathoms.o locale.o pp_pack.o pp_sort.o   \
:info:build         miniperlmain.o opmini.o perlmini.o -ldl -lm -lutil -lc 
:info:build ld: in '/opt/local/lib/libstdc++.6.dylib', file was built for 
unsupported file format ( 0xcf 0xfa 0xed 0xfe 0x 7 0x 0 0x 0 0x 1 0x 3 0x 0 0x 
0 0x 0 0x 6 0x 0 0x 0 0x 0 ) which is not the architecture being linked (i386): 
/opt/local/lib/libstdc++.6.dylib for architecture i386
:info:build clang: error: linker command failed with exit code 1 (use -v to see 
invocation)
:info:build make: *** [miniperl] Error 1
:info:build make: Leaving directory 
`/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_perl5.12/perl5.12/work/perl-5.12.4'
:info:build Command failed:  cd 
"/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_perl5.12/perl5.12/work/perl-5.12.4"
 && /usr/bin/make -j8 -w all 
:info:build Exit code: 2
:error:build org.macports.build for port perl5.12 returned: command execution 
failed


I believe that the reason for this error is that it seems that there is a 
mismatch between standard library not being universal and perl being universal:
$port installed perl5.12  libstdcxx
The following ports are currently installed:
  libstdcxx @4.8-20130411_0 (active)
  perl5.12 @5.12.4_1+universal (active)

What I am trying to understand is how that can happen, and why an upgrade would 
make this problem show up.  I don't believe that I have explicitly installed 
anything +universal.  But, I understand that certain things require universal, 
so some installs (wine-devel?), would have caused dependents to be reinstalled 
as universal.  So, I do have a bunch of things installed as universal.
So, I assume that I could get the upgrade of perl5.12 to work but manually 
installing libstdcxx as universal.  But, it seems that will cause many things 
to then be rebuilt, since many things depend on it.
My main question is why this would have developed if all I did was install 
ports and upgraded periodically.  

--Adam




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