[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
----------------------+----------------------
  Reporter:  kencu    |      Owner:  jeremyhu
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  cctools  |
----------------------+----------------------

Comment (by kencu):

 Replying to [comment:14 jmroot]:
 > Replying to [comment:7 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`.
 >
 > I don't think that's correct; clang seems to be the default in Xcode
 7.0.

 My apologies if my notation was not more clear.

 Every Xcode version < 7.0 defaulted to `gas` as assembler.

 This bug apparently showed up building gcc in 32bit mode with Xcode 7, and
 was fixed in xcode 7.3.1.

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Ticket URL: <https://trac.macports.org/ticket/58493#comment:18>
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