ubsan minimal runtime option and OpenJDK

[Baesken, Matthias]

Hi,

I wanted to try the "minimal runtime" option of ubsan because it might be faster and has other benefits.
See
https://clang.llvm.org/docs/UndefinedBehaviorSanitizer.html#minimal-runtime

Unfortunately it seems to be available only with clang on Linux, not (yet?) gcc, so I configured
--with-additional-ubsan-checks=-fsanitize-minimal-runtime --with-toolchain-type=clang

but after some compilation I run into this link error :
jdk/lib/server/libjvm.so: undefined symbol: __ubsan_handle_type_mismatch_minimal

Any ideas what's wrong here ?
https://github.com/systemd/systemd/issues/26975
suggests that we might need to adjust the linker settings to allow undefined symbols , not sure if this is the same issue ?


On the other hand, I tried the minimal runtime option with some standalone program examples outside the OpenJDK, and
The error output was indeed  “minimal”   (without line numbers of the error); so it looked not very useful to me  but this might be my limited understanding.

Any experience with this option ?

Best regards, Matthias
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