SIGSEGV when loading hello world example pass about llvm-plugin-rs HOT 4 CLOSED

After some more investigation, it appears to be a null ptr deref in PassManager::run.
I compiled rustc myself, and using that version compiled in both debug and release mode, the pass ran just fine. Maybe a slight difference in LLVM version is causing the issue?

from llvm-plugin-rs.

Hello,

I investigated a bit and couldn't manage to reproduce the error. I tried several recent nightly versions and the hello-world example worked just fine.

You should make sure that:

• The rustc version uses LLVM-15 (can be checked with rustc -vV)
• The example plugin links (at runtime) to the same LLVM binary as rustc. This can be enforced by creating a symlink before compiling your crate with the plugin:

$ NIGHTLY="2022-08-10" # replace with the version you want to check
$ rustup install "nightly-$NIGHTLY" --profile=minimal
$ RUSTC=$(rustc +nightly-$NIGHTLY -V | awk '{ print $2 }')
$ ln -s "$HOME/.rustup/toolchains/nightly-$NIGHTLY-x86_64-unknown-linux-gnu/lib/libLLVM-15-rust-$RUSTC.so" libLLVM-15.so
$ LD_LIBRARY_PATH=. cargo "+nightly-$NIGHTLY" b

Could you provide me with the exact version of the compiler where the SIGSEGV occurs?

from llvm-plugin-rs.

the version that crashes for me is "rustc 1.68.0-nightly (935dc0721 2022-12-19)". I tried the symlink but even then the SIGSEGV still occurs (probably linker shenanigans). It's probably a mismatched LLVM version, the version the crashing rustc uses is 15.0.6, while my system's libraries are on 15.0.7. This is probably why compiling rustc myself fixes the issues.

from llvm-plugin-rs.

That's probably it. I'm closing the issue since there is not much to be done about it.

from llvm-plugin-rs.