[MacPorts] #38769: atlas: incorrect compiler checking code

[MacPorts]

#38769: atlas: incorrect compiler checking code
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  Reporter:  ryandesign@…  |      Owner:  vince@…
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.1.3
Resolution:                |   Keywords:
      Port:  atlas         |
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Comment (by vince@…):

 Sorry, I was both away and kind of overburdened lately.
 Clang3.2 seems to be perfectly acceptable as a compiler as long as you
 don’t try to use AVX asm snippets. But it leads to inferior results w/r to
 gcc4.7. It may be acceptable for ppc. So I decided that rather to blindly
 blacklist it, it was best simply to warn the user they might run into
 trouble, and let them proceed.

 Thanks for point out the basic defects of the Portfile. I’m going to patch
 it right away.

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Ticket URL: <https://trac.macports.org/ticket/38769#comment:7>
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