Update protobuf binary directory path in CMakeLists.txt to avoid a compilation issue on Rocky Linux 9

[a-sevin]

Hi,

I tried to install catkit2 on Rocky Linux 9 and encountered the following compilation issue:

      FAILED: [code=1] catkit_core/CMakeFiles/catkit_core.dir/__/proto/core.pb.cc.o
      /usr/bin/g++  -pthread -B /home/micado/miniforge3/envs/catkit2/compiler_compat -DPROTOBUF_USE_DLLS -I/tmp/tmpt925y22a/build/catkit_core -isystem /home/micado/miniforge3/envs/catkit2/include -isystem /home/micado/miniforge3/envs/catkit2/include/eigen3 -O3 -DNDEBUG -fPIC -g -std=gnu++17 -MD -MT catkit_core/CMakeFiles/catkit_core.dir/__/proto/core.pb.cc.o -MF catkit_core/CMakeFiles/catkit_core.dir/__/proto/core.pb.cc.o.d -o catkit_core/CMakeFiles/catkit_core.dir/__/proto/core.pb.cc.o -c /tmp/tmpt925y22a/build/proto/core.pb.cc
      cc1plus: fatal error: /tmp/tmpt925y22a/build/proto/core.pb.cc: No such file or directory
      compilation terminated.

With the proposed fix, it works now, but I don’t understand how it could compile before.

I hope it doesn’t break things on Windows or other distributions. I hope GitHub Actions will catch any issues.

Cheers,
Arnaud

[raphaelpclt]

I do reproduce this error with Rocky Linux 9.6, but using this patch, I end up with another error.
I attach the log.
error_log_catkit2.txt

[Copilot]

Pull Request Overview

This PR fixes a compilation issue on Rocky Linux 9 by correcting the protobuf binary directory path in CMakeLists.txt from "gen/" to "proto/".

• Updates the PROTO_BINARY_DIR path to match the actual directory where protobuf files are generated

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