[MacPorts] #58493: cctools: using clang < 5.0 as default assembler generates assembly errors in some cases

[MacPorts]

#58493: cctools: using clang < 5.0 as default assembler generates assembly errors
in some cases
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  Reporter:  kencu    |      Owner:  jeremyhu
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  cctools  |
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Comment (by kencu):

 Replying to [comment:6 jmroot]:
 > Is it really impossible to build gcc with every Xcode version prior to
 7.3.1? How did anyone manage when that was all that existed?

 Prior to that point in time, `/usr/bin/as` defaulted to using `gas`.

 The errors started showing up when they flipped to defaulting to `clang`
 as assembler, and then only in `i386` code generation.

 Here is what appears to be the bug report in the llvm tree, but
 unfortunately there is no reference to any single commit that fixed it
 <https://bugs.llvm.org/show_bug.cgi?id=7635>.

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Ticket URL: <https://trac.macports.org/ticket/58493#comment:7>
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