[mlir] Target/LLVM/./MLIRTargetLLVMTests/failed_to_discover_tests_from_gtest unittest failed when LLVM_LINK_LLVM_DYLIB is enabled

[zhaoqi5]

If turning on LLVM_LINK_LLVM_DYLIB while building llvm and mlir, a mlir unittest will fail whenninja check-mlir.

: CommandLine Error: Option 'enable-branch-hint' registered more than once!
LLVM ERROR: inconsistency in registered CommandLine options
llvm-lit: /home/zhaoqi/llvm-upstream/llvm/utils/lit/lit/formats/googletest.py:38: warning: unable to discover google-tests in '/home/zhaoqi/llvm-upstream/_build/tools/mlir/unittests/Target/LLVM/./MLIRTargetLLVMTests': Command '['/home/zhaoqi/llvm-upstream/_build/tools/mlir/unittests/Target/LLVM/./MLIRTargetLLVMTests', '--gtest_list_tests', '--gtest_filter=-*DISABLED_*']' died with <Signals.SIGABRT: 6>.. Process output: b''
FAIL: MLIR-Unit :: Target/LLVM/./MLIRTargetLLVMTests/failed_to_discover_tests_from_gtest (2639 of 2685)
******************** TEST 'MLIR-Unit :: Target/LLVM/./MLIRTargetLLVMTests/failed_to_discover_tests_from_gtest' FAILED ********************

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Failed Tests (1):
  MLIR-Unit :: Target/LLVM/./MLIRTargetLLVMTests/failed_to_discover_tests_from_gtest

If turn off LLVM_LINK_LLVM_DYLIB, the test can pass.

platform: x86_64 Linux

[harrisonGPU]

I also encountered this problem, but I think we can solve it by disabling LLVM_LINK_LLVM_DYLIB and using static linking libraries.

[zhaoqi5]

Yes, we can do this to avoid this error for now.