[MacPorts] #63115: gcc11 is built for macOS 11.3 deployment target

[MacPorts]

#63115: gcc11 is built for macOS 11.3 deployment target
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  Reporter:  diekhans  |      Owner:  kjellpk
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.7.1
Resolution:            |   Keywords:  bigsur
      Port:  gcc11     |
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Comment (by kencu):

 Well, most likely we have to rewrite all the libgcc11 libraries with full
 paths on installation, and probably tweak all the binaries too, if we
 can't find some more elegant way to configure @rpath off.

 Even if we did tweak gcc11 to supply an additional @rpath reference to
 where we keep all our libgcc libs by default to all binaries it makes (do-
 able), all the other gcc versions we use would not understand that. At the
 moment the Intel gcc versions aren't using @rpath, but the plan is to add
 it soon.

 Right now, gcc10 says it is building on arm64, but not sure if it is
 really building usable software against real libraries, because it will
 use the libgcc11 libraries which have @rpath in them too.

 For the moment, I think gcc on arm64 must be just completely broken.

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Ticket URL: <https://trac.macports.org/ticket/63115#comment:15>
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