[MacPorts] #47410: Xcode 6.3 breaks gcc 4.9.2 builds with bootstrap comparison failures

[MacPorts]

#47410: Xcode 6.3 breaks gcc 4.9.2 builds with bootstrap comparison failures
-----------------------------------+--------------------------------
 Reporter:  howarth.at.macports@…  |      Owner:  macports-tickets@…
     Type:  defect                 |     Status:  new
 Priority:  Normal                 |  Milestone:
Component:  ports                  |    Version:  2.3.3
 Keywords:                         |       Port:  gcc49
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 The new Xcode 6.3's clang 6.1 (3.6.0svn) compilers break the bootstrap of
 FSF gcc 4.9.2 and gcc 4.9.3svn due to configure leaving BUILD_CONFIG
 unset.

 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65733
 https://llvm.org/bugs/show_bug.cgi?id=23192

 This same issue occurs when the llvm 3.5.1, 3.5.2 or 3.6.0 compilers are
 used to bootstrap gcc. The current workaround is to explicitly pass
 --with-build-config=bootstrap-debug to configure when the newer clang
 compilers are in use.

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Ticket URL: <https://trac.macports.org/ticket/47410>
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