[PATCH] D122862: gn build: Fix support for building the builtins for baremetal.

[Peter Collingbourne via Phabricator via llvm-commits]

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Our support for building for baremetal was conditional on a default
off arg and would have failed to build if you had somehow arranged
to pass the correct --target flag; presumably nobody noticed because
nobody was turning it on. A better approach is to model baremetal
as a separate "OS" called "baremetal" and build it in the same way
as we cross-compile for other targets. That's what this patch does.
I only hooked up the arm64 target but others can be added.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D122862

Files:
  llvm/utils/gn/build/toolchain/BUILD.gn
  llvm/utils/gn/build/toolchain/target_flags.gni
  llvm/utils/gn/secondary/compiler-rt/BUILD.gn
  llvm/utils/gn/secondary/compiler-rt/lib/BUILD.gn
  llvm/utils/gn/secondary/compiler-rt/lib/builtins/BUILD.gn
  llvm/utils/gn/secondary/compiler-rt/target.gni
  llvm/utils/gn/secondary/llvm/triples.gni

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