Enabling -fsanitize=undefined for C programs

General
1

Hey. I want to enable -fsanitize=undefined when compiling my C programs and running codecrafters test cases. This flag is useful for testing because it will terminate program if the program enters an undefined state. So if my program has a memory problem for example and is accidentally passing a test this flag will catch it.

I tried adding it to my compile.sh file but I’m getting this error.

[compile] /usr/bin/../lib/gcc/x86_64-alpine-linux-musl/9.2.0/../../../../x86_64-alpine-linux-musl/bin/ld: cannot find -lubsan
[compile] collect2: error: ld returned 1 exit status

doing a quick search turns out I need to install additional packages. How can I do it?

3

Hey @Glyphack, your repo is currently using an older buildpack (alpine) that doesn’t support adding dependencies.

I can upgrade it to a newer one (debian) that uses vcpkg. Let me know if you’d like me to proceed!

4

Yes please go ahead or let me know how to apply the change.

5

It’s done!

Just pull the latest commit to start using the new buildpack. You likely won’t need to install any new dependencies, but let me know if you run into anything!