configure 64bit -arch test

[Ryan Schmidt]

On Aug 8, 2013, at 12:34, jlm at justinfront.net wrote:

> I don't like -arch flag since it limits which gcc I use to apple versions, and the apple one on my leopard is very old, prefer you avoid using -arch flag, I am fairly sure you don't need to use it, then I can decide to use mp46 gcc or something.  Stuff like arch is one of the reasons I did not get rust to compile locally.

MacPorts uses -arch flags to compile all ports. That's not going to change.

My understanding is that gcc47 supports -arch flags now. So does clang. So you have several compiler choices available to you.