[MacPorts] #65472: gcc12/libgcc12: has made the @rpath transition happen, now we need to manage it

[MacPorts]

#65472: gcc12/libgcc12: has made the @rpath transition happen, now we need to
manage it
--------------------+-------------------------
 Reporter:  kencu   |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  libgcc, gcc
--------------------+-------------------------
 As expected now that we have included Iain's latest patch in our default
 libgcc12 installation, the @rpath transition is upon us:

 {{{
 % otool -L /opt/local/lib/libgcc/libstdc++.6.dylib
 /opt/local/lib/libgcc/libstdc++.6.dylib:
         @rpath/libstdc++.6.dylib (compatibility version 7.0.0, current
 version 7.30.0)
         /opt/local/lib/libiconv.2.dylib (compatibility version 9.0.0,
 current version 9.1.0)
         @rpath/libgcc_s.1.1.dylib (compatibility version 1.0.0, current
 version 1.1.0)
         /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current
 version 1311.0.0)
 }}}

 however, only two of our gcc ports, gcc12 and gcc-devel (on arm only) are
 using the extra piece that adds the needed rpath directory to the rpath
 search directory list.

 So any ports that are newly built with any other version of gcc on systems
 newer than MacOS 10.11 will be broken, as they won't find the @rpath
 libraries.

 We should update all our gcc versions (gcc10 and gcc11) on all systems to
 Iain's forks to fix them.

 All other versions of gcc (gcc9 and below, I believe) are not going to get
 Iain's @rpath fixes and will build broken binaries unless the needed rpath
 search paths are added manually to every build, which I don't recommend.

 So gccs less than gcc10 will need to be blacklisted I suppose on MacOS
 10.11 and newer.

 It is quite possible that some broken software out there will need to be
 rebuilt to get the needed rpaths embedded in them.

-- 
Ticket URL: <https://trac.macports.org/ticket/65472>
MacPorts <https://www.macports.org/>
Ports system for macOS