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397b92e02d
It is enabled with ENABLE_ASAN_UBSAN like other compilers. Technically it only enables ASAN as UBSAN is not available, meaning to make the variable names fully correct we'd need to separate it into two checks: ENABLE_ASAN and ENABLE_UBSAN, but the convenience of combining them into the same flag outweighs the theoretical correctness. Also note in CONTRIBUTING.md that debug builds in ASAN is not supported. Technically it is the debug runtime that is not supported, which cmake automatically enables when using the debug build type. However, neovim can't be built with debug builds without linking to the debug runtime since the third party libraries has likely been linked to the debug runtime if it was built with debug build type. This technicality is likely uninteresting to the potential developer and it's easier to just say to use a release build type.