[MacPorts] #59706: libgcc7 @7.5.0 does not build on PPC Mac OS X 10.5.8, Leopard, because of internal compiler error

[MacPorts]

#59706: libgcc7 @7.5.0 does not build on PPC Mac OS X 10.5.8, Leopard, because of
internal compiler error
------------------------+---------------------
  Reporter:  ballapete  |      Owner:  (none)
      Type:  defect     |     Status:  closed
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.6.2
Resolution:  fixed      |   Keywords:  leopard
      Port:  libgcc7    |
------------------------+---------------------

Comment (by ballapete):

 I got brave, quite motivated from the upgrade of macOS High Sierra – it
 still promises to last 41 more minutes (44 after recalculation). So I
 activated `libgcc7 @7.5.0_0`. Again `CMake` failed to work and I
 reactivated `libgcc7 @7.4.0_3` at once. During both changes I was informed
 that `bsdtar` had failed:

 {{{
 Dyld Error Message:
   Symbol not found: ___once_proxy
   Referenced from: /opt/local/lib/libicuuc.65.dylib
   Expected in: /usr/lib/libstdc++.6.dylib
 }}}

 Is this correct? Shouldn't it be using
 `/opt/local/lib/libgcc/libstdc++.6.dylib`? And when `bsdtar` (of
 `libarchive`) fails, couldn't this, an incomplete installation, be the
 cause for the `libgcc7 @7.5.0_0` failure?

-- 
Ticket URL: <https://trac.macports.org/ticket/59706#comment:53>
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