[Bug 261798] lang/ghc: Fails to compile due to base/ports LLVM triple target names: error: Warning: Couldn't figure out LLVM version!

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261798

--- Comment #2 from Brooks Davis <brooks@FreeBSD.org> ---
I dug back to llvm60 (the version in the ghc issue) and don't see an obvious
path for amd64-portbld-freebsd to end up on the target list. The relevant cmake
flags are:

-DLLVM_DEFAULT_TARGET_TRIPLE=x86_64-portbld-freebsd13.0
-DLLVM_HOST_TRIPLE=x86_64-portbld-freebsd13.0

If we once patched the port to use that triple it's been a long time (though
maybe it was a change in cmake infrastructure?).  Presumably ghc should be
patched to look for x86_64. Looking at the patch, I might leave the amd64 lines
alone and simply add the new one.


On the LLVM port side, there's an argument there's an argument for dropping
`portbld` from LLVM_DEFAULT_TARGET_TRIPLE since it's non-standard, but I don't
think that's especially related to this PR.

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