Streamer cannot compile using musl

[motoras]

Problem

Hi guys,
I was trying to compile solana with musl as target and I got the following error:

 --> /home/user/.cargo/registry/src/github.com-1ecc6299db9ec823/solana-streamer-1.14.3/src/recvmmsg.rs:103:70
    |
103 |         unsafe { libc::recvmmsg(sock_fd, &mut hdrs[0], count as u32, MSG_WAITFORONE, &mut ts) };
    |                  --------------                                      ^^^^^^^^^^^^^^ expected `u32`, found `i32`
    |                  |
    |                  arguments to this function are incorrect
    |
note: function defined here
   --> /home/user/.cargo/registry/src/github.com-1ecc6299db9ec823/libc-0.2.134/src/unix/linux_like/linux/musl/mod.rs:702:12
    |
702 |     pub fn recvmmsg(
    |            ^^^^^^^^
help: you can convert an `i32` to a `u32` and panic if the converted value doesn't fit
    |
103 |         unsafe { libc::recvmmsg(sock_fd, &mut hdrs[0], count as u32, MSG_WAITFORONE.try_into().unwrap(), &mut ts) };
    |                                                                                    ++++++++++++++++++++

I used the cargo command cargo build --release --target x86_64-unknown-linux-musl with rust rustc 1.63.0 (4b91a6ea7 2022-08-08) I needed to compile for musl, as I was planing to use solana from an aws lambda function written in rust(aws rust runtime requires to compile your rust function with musl).

[github-actions]

Hi @motoras,

Thanks for your question!

We want to make sure to keep signal strong in the GitHub issue tracker – to make sure that it remains the best place to track issues that affect the development of Solana itself.

Questions like yours deserve a purpose-built Q&A forum. Unless there exists evidence that this is a bug with Solana itself, please post your question to the Solana Stack Exchange using this link: https://solana.stackexchange.com/questions/ask

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[arb000r]

Did you manage to solve this? Having the same problem

[motoras]

No. I just avoided using musl, by using a more recent cargo lambda and compiling for arm.

[arb000r]

@steveluscher would it be possible to support MUSL rust by implementing the change to use .into() ?

[steveluscher]

I don't know, but feel free to open an issue here, phrased as a feature request!

[billythedummy]

think this is a rust libc issue: rust-lang/libc#2945 . Given their breaking change policy it'll probably take a while before the new versions of libc are release with this fixed. .try_into().unwrap() would probably work as a temporary workaround before then but idk if we should introduce this potential tech debt