LTC enablement on various compile flows

[powderluv]

Tracking various modes to enable LTC in

• OOT Builds (Reenable LTC in out-of-tree build (for real this time) #1205)
• Source builds (?) (Resolve remaining LTC CI failures #1110)
• When built from setup.py (on Release builds) (Reenable LTC in out-of-tree build (for real this time) #1205)
• When build via seutp.py on macOS (cross compile arm64) (LTC MacOS-arm64 linkage failure #1253)

[henrytwo]

Source builds (?)

Building LTC from source works, as far as the configs used in CI. Is there an instance where you see it failing still?

[powderluv]

Great to hear. Feel add / remove from the list. I thought it was disabled but maybe it wasn't

[henrytwo]

Here's a ticket to track the OOT build problem: #1154

I believe the other build configs hit the same linkage issues as OOT, so it's possible that this may resolve the other problems you listed too.

[henrytwo]

@powderluv looks like OOT build is fixed now. I believe release build runs daily, so we'll find out if that works soon, but I'm not sure about running it on macOS. Is this something that can be triggered from CI?

[powderluv]

Sorry to report the nightly builds just failed: https://github.com/llvm/torch-mlir/runs/7735569399?check_suite_focus=true

I triggered a "oneshot" nightly that can build Release linux and macOS builds. You can also run it on main or any torch-mlir branch.

We probably should address the root cause or revert for now.

[henrytwo]

😭 I'll revert for now and investigate tomorrow

[henrytwo]

FYI I'm going to be working on fixing this problem in the following PR: #1205