tree a17869d77c5a7f94ce80c70694bbd3575b6aa826
parent 461bf244929f4dabd128a69ee4d9ca75b9976c12
author Xiangdong Ji <xiangdong.ji@arm.com> 1567308956 +0000
committer Than McIntosh <thanm@google.com> 1568859494 +0000

gollvm: support build on arm64 linux

This CL serves as part of an initial change for enabling gollvm
building on arm64 linux (gollvm repo.), rest of the change will
be covered by another one made to the gofrontend repo.

It covers tool-chain setup, cpu attributes setting, and a few fixes
to cmake modules, some build settings are not flexible enough now
and require further refinement (perhaps along with x86_64).

The c-abi setup is not avaiable now.

Tested with triple aarch64-unknown-linux-gnu under Release and
Debug modes (with a minor change in llvm which will be investigated
further), clang 6.0+ or gcc-9 is recommended, and an additional
CMAKE option -DGOLLVM_USE_SPLIT_STACK=OFF is needed if your tool
chain doesn't support stack split.

Fixes golang/go#33711

Change-Id: I1554d2245cf53ea3f62c28e052f1155d67f6127c
Reviewed-on: https://go-review.googlesource.com/c/gollvm/+/194998
Reviewed-by: Than McIntosh <thanm@google.com>