[MacPorts] #70320: llvm should build with option LLVM_CREATE_XCODE_TOOLCHAIN

[MacPorts]

#70320: llvm should build with option LLVM_CREATE_XCODE_TOOLCHAIN
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 Reporter:  crowell      |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.9.3
 Keywords:               |       Port:  llvm
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 when building LLVM, it's helpful to include the
 `LLVM_CREATE_XCODE_TOOLCHAIN` to create an .xctoolchain for use in xcode.

 This should probably be the default, or at least, a variant (probably the
 default though, as it's not really any overhead).

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Ticket URL: <https://trac.macports.org/ticket/70320>
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