clang 3.4 can't be configured (part of a selfupdate)

[Jeremy Huddleston Sequoia]

> On Jul 30, 2016, at 18:16, Ryan Schmidt <ryandesign at macports.org> wrote:
> 
> 
>> On Jul 30, 2016, at 7:58 AM, [ftp83plus] wrote:
>> 
>>> El 29 jul 2016, a las 16:45, Lawrence Velázquez escribió:
>>> 
>>>> On Jul 29, 2016, at 1:35 AM, Ken Cunningham wrote:
>>>> 
>>>>> /opt/local/bin/clang++-mp-3.3   -pipe -Os -stdlib=libc++   -arch i386 -mmacosx-version-min=10.6 -Wl,-search_paths_first -Wl,-headerpad_max_install_names  -L/opt/local/lib -Wl,-headerpad_max_install_names  CMakeFiles/cmTC_70577.dir/testCXXCompiler.cxx.o  -o cmTC_70577  
>>>>> ld: warning: ignoring file /usr/lib/libc++.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): /usr/lib/libc++.dylib
>>>> 
>>>> You're building for -arch i386, but your libc++.dylib does not have
>>>> that architecture (it's likely going to be x64_86) -- So somewhere
>>>> ( probably in your macports.conf file, I would think) your
>>>> architecture is not set correctly.
>>> 
>>> The libomp port is being installed +universal. Since it uses the muniversal-1.0 portgroup, MacPorts builds it for each architecture separately, then lipo(1)s everything together at the end.
>>> 
>>> The problem is that the i386 build is trying to link to libc++, which in your case appears to be provided by libcxx. But libomp does not declare a dependency on libcxx, so MacPorts did not attempt to rebuild libcxx +universal. You may have to do this yourself.
>>> 
>>> vq
>> 
>> So should I rebuild libcxx +universal variant first before performing Step 4 of the LibcxxOnOlderSystems?
> 
> Jeremy, shouldn't we modify the LibcxxOnOlderSystems instructions to include installing libcxx +universal?


Something like this should work:

sudo port -v -s upgrade --enforce-variants libcxx +universal universal_archs="x86_64 i386" configure.compiler=macports-clang-3.8

or:

sudo port -v -s upgrade --enforce-variants ld64 +ld64_127
sudo port -v -s upgrade --enforce-variants libcxx +universal universal_archs="x86_64 i386 ppc" configure.compiler=macports-clang-3.8

I've updated the wiki as well.
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