[MacPorts] #54149: gcc6 fails to compile because "configure: error: cannot compute sizeof (long long)"

[MacPorts]

#54149: gcc6 fails to compile because "configure: error: cannot compute sizeof
(long long)"
--------------------+------------------
 Reporter:  RJVB    |      Owner:
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  gcc6
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 Back in february I successfully built port:gcc6 with a tiny patch that
 makes G++ use libc++ and thus become a proper citizen on OS X 10.9 and
 later.

 Today I wanted to build a slightly improved version and find my builds
 fail no matter what I try because the bootstrapped gcc compiler (xgcc)
 chokes on the configure test to determine the sizeof(long long).

 Googling the error suggests that this has to do with the presence (or not)
 of the GNU binutils - which I don't have and didn't have either back in
 February.

 The only seemingly relevant port I updated since then is ld64_latest, but
 re-activating the version I had back then makes no difference. My patch
 cannot be the culprit either because it affects only the C++ compiler,
 which isn't used during the GCC build.

 Any ideas?

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Ticket URL: <https://trac.macports.org/ticket/54149>
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