[MacPorts] #51245: libgcc-devel @6-20160421_0 build fails on OS X 10.10.5

[MacPorts]

#51245: libgcc-devel @6-20160421_0 build fails on OS X 10.10.5
-----------------------------------+----------------------
  Reporter:  mopihopi@…            |      Owner:  mww@…
      Type:  defect                |     Status:  new
  Priority:  Normal                |  Milestone:
 Component:  ports                 |    Version:  2.3.4
Resolution:                        |   Keywords:  haspatch
      Port:  libgcc, libgcc-devel  |
-----------------------------------+----------------------
Changes (by ryandesign@…):

 * keywords:   => haspatch


Comment:

 I was able to reproduce the build failure of libgcc @6.1.0 on Yosemite
 with Xcode 7.1.1. Based on the homebrew bug report, I tried adding
 `--with-build-config=bootstrap-debug`; the build of libgcc succeeded. I'm
 still building gcc6 to make sure that works. gcc7 will surely need the
 same fix. I still need to test earlier versions to see if they're
 affected. `--with-build-config` was added in gcc 4.5 so we could add the
 flag all the way back to the gcc45 port. (If I understand correctly,
 bootstrap-debug was the default build config before that flag was added,
 so versions earlier than 4.5 should not be affected.)

 My patch also changes build.target from bootstrap to bootstrap-lean, which
 should have no effect other than the build using less disk space.

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Ticket URL: <https://trac.macports.org/ticket/51245#comment:22>
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