[MacPorts] #61494: gcc9 @9.3.0 "Failed to build libgcc9: command execution failed" in macOS 11.0 Big Sur

[MacPorts]

#61494: gcc9 @9.3.0 "Failed to build libgcc9: command execution failed" in macOS
11.0 Big Sur
-------------------------+--------------------
  Reporter:  kgerheiser  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.4
Resolution:              |   Keywords:  bigsur
      Port:  libgcc9     |
-------------------------+--------------------

Comment (by cjones051073):

 OK, I see why the sanitiser libs are not being made. GCC configuration is
 riddled with lines like

 {{{
   x86_64-*-darwin1[2-9]* | i?86-*-darwin1[2-9]*)
 }}}

 which don't match Darwin20.... The above is what is used to enable
 sanitisers, and without a match for darwin20 they are disabled.

 TBH, from what I can see its a bit of a miracle the builds work at all...

 I am not sure the effort to fix things just for the sanitisers is worth
 it, unless someone has a killer reason ?

 eventually gcc11 will come along which should fix all this properly from
 upstream..

-- 
Ticket URL: <https://trac.macports.org/ticket/61494#comment:11>
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