Address or Undefined Sanitizer with Clang

[NikLeberg]

I tried to compile NVC with clang and enable the flags --enable-asan or --enable-ubsan which produced an ungodly amount of runtime errors detected by either sanitizers.

If I compile NVC with gcc and only enable --enable-asan, then it seems to work ok.

What combinations are supported? Or is clang not supported at all?

[NikLeberg]

I see that for the CI leak detection is turned off:

nvc/.github/workflows/build-test.yml

Line 36 in 5b805da

run: ASAN_OPTIONS=detect_leaks=0 make -C build check

Is there a specific reason? Are all detected leaks false-positives? Or should one have a closer look?

[nickg]

What combinations are supported? Or is clang not supported at all?

Clang checks some different things and I normally build with GCC. I think you mean ubsan errors here? Asan shouldn't have errors with either compiler. I fixed most of the ubsan warnings from Clang on my Mac. The one about unaligned access in interp_store is harmless.

Is there a specific reason? Are all detected leaks false-positives? Or should one have a closer look?

They are mostly benign leaks of objects that are allocated once and then persist until exit. I check these occasionally but I don't think there's anything worth worrying about.