rclrs 0.4.1 doesn't build for Rust 1.75

[maspe36]

I am playing around in a workspace that doesn't clone ros2_rust but instead pulls from crates.io. I am trying to target Rust 1.75, our target version, and I am unable to build.

I get the same issue as described in #449. In short, our the fix for this issue, #452 is not in rclrs 0.4.1.

[roboticswithjulia]

Hello @maspe36 which version of rustup are you using? Could you try to do this rustup --version and send back the output? Thank you!

[maspe36]

Sure thing Julia, here you go

sam@orange:~$ rustup --version
rustup 1.27.1 (54dd3d00f 2024-04-24)
info: This is the version for the rustup toolchain manager, not the rustc compiler.
info: The currently active `rustc` version is `rustc 1.75.0 (82e1608df 2023-12-21)`

[roboticswithjulia]

Hello @maspe36 I had same issue the other way and how I solved was uninstalling rust and install the newest version:

rustup self uninstall
curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- --default-toolchain 1.81.0 -y (maybe worth a try to install the last one 1.85.1

Let me know if it solves the issue.

[maspe36]

Well I think the point of this issue is that we claim that Rust 1.75 is our minimum supported version, but our latest released version of rclrs to crates.io doesn't build with Rust 1.75

IMO the fix for this is to release a new version of rclrs to crates.io

[roboticswithjulia]

Yes, you are right! This is a better way to fix the issue rather than update rust version. Let's leave this question to the maintainers of the repository then.

[esteve]

@roboticswithjulia

Yes, you are right! This is a better way to fix the issue rather than update rust version. Let's leave this question to the maintainers of the repository then.

FYI, @maspe36 is one of the maintainers of rclrs

[roboticswithjulia]

Thank you @esteve for the clarification! Sorry, my bad! @maspe36 Apologies!! Then I was talking with the right person!!!

[roboticswithjulia]

I was thinking to update the ./Dockerfile to use the last rust version, but I am also bit unsure if this also would be aligned in how this MR should be fixed.

[esteve]

@roboticswithjulia this ticket is because we officially support the 1.75 version of the Rust toolchain. When we hopefully release the first version of ros2-rust as part of a ROS distro, the version of Rust that Ubuntu ships with is 1.75, so that's why we don't want to update the version of Rust in Dockerfile either.

[roboticswithjulia]

I understand now, thank you for the clarification @esteve !!

[roboticswithjulia]

I do not know if this might also be related with this issue, but, when I am trying to build just the minimal_pub_sub examples, it neither cannot find the std_msgs .

julia@jmr:~/Desktop/ros2_rust/examples/minimal_pub_sub$ cargo build
    Updating crates.io index
error: failed to select a version for the requirement `std_msgs = "*"`
  version 4.2.3 is yanked
location searched: crates.io index
required by package `examples_rclrs_minimal_pub_sub v0.4.1 (/home/julia/Desktop/ros2_rust/examples/minimal_pub_sub)`

[roboticswithjulia]

⏫ Solved using the dockerfile https://github.com/ros2-rust/ros2_rust/blob/main/docs/building.md#option-2-using-the-docker-image instructions.