[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...
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  Reporter:  kencu        |      Owner:  kencu
      Type:  enhancement  |     Status:  closed
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:  wontfix      |   Keywords:  leopard powerpc
      Port:               |
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Comment (by kencu):

 I am not an expert, but as I understand the term in this context, lowering
 refers to the process of taking a higher level language representation and
 changing it towards something "lower", ie closer to machine language.

 So c++ becomes LLVM-IR and that becomes intermediate steps until the final
 assembly language is printed out.  That then used to be sent to a separate
 assembler, but on Intel LLVM does the assembly by itself too for many
 targets.

 The stage that I believe has never been finished is the stage where
 arguments from the LLVM-IR are modified into the proper spacing and
 register assignments to match the Darwin PowerPC ABI.

 This has been done for the ELF (Linux) PowerPC ABI, and I currently run
 llvm-13, clang-13, rust, etc on my G4 and G5 PowerMacs using Debian Linux
 11. So it is possible to do the fixing for the Darwin PowerPC ABI, but
 nobody has done it.

 See, for example:

 https://llvm.org/doxygen/structllvm_1_1PPCTargetLowering_1_1CallFlags.html#details

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Ticket URL: <https://trac.macports.org/ticket/53184#comment:35>
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