LLVM macos pipeline error

[ksaur]

Pipeline cache expired, triggering a TVM rebuild.

While installing TVM in pipeline:

-- Could NOT find GTest (missing: GTEST_LIBRARY GTEST_INCLUDE_DIR GTEST_MAIN_LIBRARY) 
-- Use llvm-config=/usr/local/opt/llvm@14/bin/llvm-config --link-static
CMake Error at cmake/utils/FindLLVM.cmake:76 (message):
  Fatal error executing: /usr/local/opt/llvm@14/bin/llvm-config --link-static
  --libfiles
Call Stack (most recent call first):
  cmake/modules/LLVM.cmake:[31](https://github.com/microsoft/hummingbird/actions/runs/4009447455/jobs/7046411881#step:16:32) (find_llvm)
-- Configuring incomplete, errors occurred!
  CMakeLists.txt:475 (include)
See also "/Users/runner/work/hummingbird/tvm/build/CMakeFiles/CMakeOutput.log".

[ksaur]

CC: @mshr-h - Is this something you have seen before?
I was looking for the last successful rebuild of this in the Action history, but I think it expired

[mshr-h]

I haven't seen any similar error. I'll take a look at it.

[mshr-h]

The macOS 12 image has LLVM 15 by default. When building TVM with LLVM@15, we got zstd link error.
By installing LLVM@14 and using it, the problem was solved.

[ksaur]

The macOS 12 image has LLVM 15 by default. When building TVM with LLVM@15, we got zstd link error.
By installing LLVM@14 and using it, the problem was solved.

Interesting. Thanks so much for the investigation and temp fix!