[MacPorts] #65179: py-libxml2, py-Pillow, py-gdbm: need to either blacklist gcc-4* or patch out -Wno-unused-result

[MacPorts]

#65179: py-libxml2, py-Pillow, py-gdbm: need to either blacklist gcc-4* or patch
out -Wno-unused-result
-------------------------+-------------------------------------------------
  Reporter:              |      Owner:  MarcusCalhoun-Lopez
  barracuda156           |
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.7.2
Resolution:              |   Keywords:  powerpc, leopard, snowleopard,
      Port:  py-libxml2  |  rosetta
  py-Pillow              |
-------------------------+-------------------------------------------------

Comment (by barracuda156):

 Replying to [comment:7 kencu]:
 > is it somewhere in py-cython that where the flag Wno-unused-result
 originates? I have not as yet been able to see exactly where that flag
 gets thrown in, but it's some python build support port I guess.
 >
 > blacklisting older compilers is one way around this, but TBH it is not
 really a great way around it, as that can then come back to bite you when
 you are no longer able to bootstrap any more.
 >
 > Sometimes it's the only way out, though.

 If it is thrown in by some build dependency, then patching it out should
 be easy enough. If not, then patching it out of every single port that
 uses it, I guess, is out of possibility, practically.

-- 
Ticket URL: <https://trac.macports.org/ticket/65179#comment:8>
MacPorts <https://www.macports.org/>
Ports system for macOS