[MacPorts] #53184: A cxx11-compatible clang compiler on 10.5 PPC ?Some progress...

[MacPorts]

#53184: A cxx11-compatible clang compiler on 10.5 PPC ?Some progress...
--------------------------+-----------------------------
  Reporter:  kencu        |      Owner:  kencu
      Type:  enhancement  |     Status:  closed
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:  wontfix      |   Keywords:  leopard powerpc
      Port:               |
--------------------------+-----------------------------

Comment (by kencu):

 Those MacPorts instructions are correct for Intel systems, but will not
 work properly on PowerPC systems.

 For PowerPC systems, you can build certain early versions of clang
 (clang-3.4 up to about clang-7.0) in various ways on PowerPC systems. For
 clang-3.4, gcc-4.2 from MacPorts can build it in MacPorts, with minor
 Portfile surgery.

 I have built up to clang-5.0 myself on PowerPC, and as per Iain's repo
 above, he has built up to clang-7.0 (plus llvm-7.0 and libcxx-7.0) on
 PowerPC bootstrapping them with gcc-5.0.

 However, the built clangs (all of them) are broken in various ways. Most
 prominently, they do not have a completed Darwin PowerPC ABI
 infrastructure, so when they build software, the calling conventions are
 wrong for using system libraries and other libraries that are properly
 built against the Darwin PowerPC ABI. This is obviously a deal-breaker
 right now.

 In addition, the c++ exception handling never worked, and still doesn't.

 If you want to get a working clang/llvm compiler on PowerPC darwin, your
 best approach at present would be to take Iain's fork of llvm above, try
 building it, and then (if you know PowerPC assembly and can read the
 Darwin PowerPC ABI manual clearly enough) help him fix the clang lowering
 for PowerPC darwin.

 I know Iain would like to finish it, but he has a lot of other things on
 the plate. I thought I would be able to learn enough to help him finish
 it, but I was not able to.

 Now I just installed debian linux on my PowerPC systems, and they run
 rust, llvm/clang-13, gcc-11, etc with no trouble at all. So that is what I
 did, in the end.

-- 
Ticket URL: <https://trac.macports.org/ticket/53184#comment:31>
MacPorts <https://www.macports.org/>
Ports system for macOS