[MacPorts] #62332: Cannot build gcc7 with +universal on Intel Tiger

[MacPorts]

#62332: Cannot build gcc7 with +universal on Intel Tiger
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  Reporter:  Wowfunhappy  |      Owner:  (none)
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  gcc7         |
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Comment (by kencu):

 Do you want the short version of the story, or the long version :>

 Short version of the story: cross-arch universal building of all gcc
 versions stopped working on MacPorts as of apple-gcc42, and has not worked
 on any newer gcc version since about 2009.

 The only thing that works is same-processor-family universal building (eg
 ppc/ppc64 or i386/x86_64). This is because when we build gcc +universal on
 MacPorts, we don't actually build it +universal, we only build libgcc as
 having both i386 and x86_64 (or ppc/ppc64) archs in it ("multilib").

 To build a fully-functional cross-arch universal gcc is a project that
 people lost interest in once PowerPC systems were less common (but has new
 enthusiasm now that arm64/x86_64 is out there). I have built one manually
 myself, but there is a missing component (driverdriver.c updated for newer
 gcc versions).

 For happiness on older systems, I suggest you set your universal_archs in
 macports.conf to ppc/ppc64 on a PowerPC machine, or i386/x86_64 on an
 Intel machine. That works really quite well on Leopard systems. For Tiger
 systems, to be honest there were so many issues that I reduced my attempts
 to build +universal in Tiger and I'm happy to have non-universal builds
 going as well as they do.


 I have Octave for Tiger PPC, clang-7.0 for Tiger Intel, gcc7 for Tiger
 (both PPC, Intel) and thousands more.

-- 
Ticket URL: <https://trac.macports.org/ticket/62332#comment:2>
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