[MacPorts] #52468: gtk3 3.22.0_0 build fails on 10.5 ppc

[MacPorts]

#52468: gtk3 3.22.0_0 build fails on 10.5 ppc
-------------------------+-----------------------------
  Reporter:  dgonyier@…  |      Owner:  dbevans
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.3.4
Resolution:              |   Keywords:  leopard powerpc
      Port:  gtk3        |
-------------------------+-----------------------------

Comment (by kencu):

 I suppose I should rebuild libgcc to default to gcc4-compatible ABI mode
 on 10.4 and 10.5 PPC if I'm going to do this. I wonder if that would make
 it fully-compatible with the system's libstdc++, or just less-
 incompatible?

 <https://gcc.gnu.org/onlinedocs/libstdc++/manual/configure.html>

 {{{
 --with-default-libstdcxx-abi=gcc4-compatible
 }}}

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Ticket URL: <https://trac.macports.org/ticket/52468#comment:58>
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