[MacPorts] #65146: gcc11/gcc12 portfiles need minor changes to enable building with gcc10-bootstrap on Leopard and Rosetta

[MacPorts]

#65146: gcc11/gcc12 portfiles need minor changes to enable building with
gcc10-bootstrap on Leopard and Rosetta
------------------------------+-------------------------------------------
  Reporter:  barracuda156     |      Owner:  catap
      Type:  defect           |     Status:  closed
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.7.2
Resolution:  fixed            |   Keywords:  snowleopard, leopard, powerpc
      Port:  gcc11, libgcc11  |
------------------------------+-------------------------------------------

Comment (by kencu):

 Replying to [comment:9 barracuda156]:
 > Replying to [comment:4 kencu]:
 > > gcc11 builds using clang on 10.6 (for Intel).
 > >
 > > Here you are trying to build gcc11 on 10.6 on PPC using
 gcc10-bootstrap?
 > >
 > > We haven't really explored that path as yet. Someday we may set up
 gcc11/libgcc11 (or gcc12/libgcc12) to build with gcc10-bootstrap. That
 will require somebody figuring out how it should be done, and on which
 systems.
 > >
 > > But it is not presently supported, and there is no error in gcc11 or
 circular dependancy a this time.
 >
 > Well, FWIU, `gcc10-bootstrap` was precisely designed to help older
 systems to get to the latest compilers (which cannot be bootstrapped
 directly).

 That is indeed a plan, once gcc10-bootstrap builds everywhere it is
 needed, someone will correctly modify the builds of gcc11+ to build with
 gcc10-bootstrap, and then trigger the ancient systems to use libgcc12 as
 the new default by changing a couple of numbers in the libgcc port and
 elsewhere (I showed you how to do this last year).

 Step 1. make sure gcc10-bootstrap builds everywhere (Tiger to Mojave,
 anyway). Universal where needed (10.6 at least).

 Step 2. modify gcc11+ to build with it, properly, including universal, on
 certain systems TBA (? Tiger to Lion)

 Step 3. update libgcc and compiler selection code to use libgcc12 on all
 system

 But nobody with the proper skills and time has been motivated to do this
 yet, so it is still presently unsupported on MacPorts.

-- 
Ticket URL: <https://trac.macports.org/ticket/65146#comment:18>
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