Multi-threading bug in compiler

[muellch]

To reproduce:

• compile llvm in Release
• compile OEC in release
• maybe use gcc instead of clang

The bug only appears sometimes.
The bug goes away if multi threading is deactivated for OEC with --mlir-disable-threading

For error message see screenshot:

[jmgorius]

It may be useful to run a ThreadSanitizer build to see where exactly the data race is happening. I updated the standalone template to include sanitizer build support.

If you use the sanitizers.cmake module you can enable TSAN by adding -DUSE_SANITIZER=Thread to the CMake configuration.

[gysit]

I fixed a gcc issue in the the development branch. We should retest this as soon as we can merge back... Thanks for the pointer to the thread sanitizer (didn't know it exists)

[gysit]

does the problem still appear in the latest builds?