Using gcc on clang-based systems

[Jason Bacon <bacon4000%gmail.com@localhost>]

I'd like to try the following setup on Darwin and FreeBSD:

1. Use native clang to build gcc48

2. Use gcc48 to build everything else

Much like the system we've been discussing for CentOS 6 and other 
systems with an outdated base GCC.

The approach is similar here, but the motive is different.  On 
clang-based Darwin and FreeBSD systems, there are problems building 
packages that rely on some libraries built with clang and and others 
built with gcc.  math/R is one high-profile example, but anything built 
with gfortran might be problematic.

So I'd like to try forsaking the native clang and building everything 
with the same pkgsrc gcc, which I suspect will cause minimal issues 
given that most pkgsrc packages are designed to work with any compiler.

I'm not seeing an obvious way to accomplish this at the moment. I've 
tried a few things with PKGSRC_COMPILER and USE_PKGSRC_GCC, but no luck 
yet.  Setting PKGSRC_COMPILER=gcc seems to put any build into a 
recursive infinite loop.  USE_PKGSRC_GCC=yes seems to have no effect 
without PKGSRC_COMPILER.

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