Missing SO_INCOMING_CPU compiling with armv7-unknown-linux-musleabi

[zonyitoo]

Compiling socket2 v0.3.19
Running `rustc --crate-name socket2 --edition=2018 /usr/local/cargo/registry/src/mygithub.libinneed.workers.dev-1ecc6299db9ec823/socket2-0.3.19/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type lib --emit=dep-info,metadata,link -C opt-level=3 -C panic=abort -C codegen-units=1 -C metadata=9516879405a31528 -C extra-filename=-9516879405a31528 --out-dir /tmp/cargo-installQyepjN/armv7-unknown-linux-musleabi/release/deps --target armv7-unknown-linux-musleabi -C linker=armv6-linux-musleabi-gcc -L dependency=/tmp/cargo-installQyepjN/armv7-unknown-linux-musleabi/release/deps -L dependency=/tmp/cargo-installQyepjN/release/deps --extern cfg_if=/tmp/cargo-installQyepjN/armv7-unknown-linux-musleabi/release/deps/libcfg_if-a21588f9f01fd146.rmeta --extern libc=/tmp/cargo-installQyepjN/armv7-unknown-linux-musleabi/release/deps/liblibc-2305531b0b6bff17.rmeta --cap-lints allow -C relocation-model=pic -C prefer-dynamic=off -C target-feature=+crt-static,-vfp2,-vfp3`
Compiling socket2 v0.4.0
Running `rustc --crate-name socket2 --edition=2018 /usr/local/cargo/registry/src/mygithub.libinneed.workers.dev-1ecc6299db9ec823/socket2-0.4.0/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C opt-level=3 -C panic=abort -C linker-plugin-lto -C codegen-units=1 --cfg 'feature="all"' -C metadata=4b78b189cd4beac3 -C extra-filename=-4b78b189cd4beac3 --out-dir /tmp/cargo-installQyepjN/armv7-unknown-linux-musleabi/release/deps --target armv7-unknown-linux-musleabi -C linker=armv6-linux-musleabi-gcc -L dependency=/tmp/cargo-installQyepjN/armv7-unknown-linux-musleabi/release/deps -L dependency=/tmp/cargo-installQyepjN/release/deps --extern libc=/tmp/cargo-installQyepjN/armv7-unknown-linux-musleabi/release/deps/liblibc-2305531b0b6bff17.rmeta --cap-lints allow -C relocation-model=pic -C prefer-dynamic=off -C target-feature=+crt-static,-vfp2,-vfp3`
error[E0425]: cannot find value `SO_INCOMING_CPU` in crate `libc` --> /usr/local/cargo/registry/src/mygithub.libinneed.workers.dev-1ecc6299db9ec823/socket2-0.4.0/src/sys/unix.rs:1201:69 | 1201 | getsockopt::<c_int>(self.inner, libc::SOL_SOCKET, libc::SO_INCOMING_CPU) | ^^^^^^^^^^^^^^^ not found in `libc`
error[E0425]: cannot find value `SO_INCOMING_CPU` in crate `libc` --> /usr/local/cargo/registry/src/mygithub.libinneed.workers.dev-1ecc6299db9ec823/socket2-0.4.0/src/sys/unix.rs:1217:23 | 1217 | libc::SO_INCOMING_CPU, | ^^^^^^^^^^^^^^^ not found in `libc`
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0425`.
error: could not compile `socket2` Caused by:
process didn't exit successfully: `rustc --crate-name socket2 --edition=2018 /usr/local/cargo/registry/src/mygithub.libinneed.workers.dev-1ecc6299db9ec823/socket2-0.4.0/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C opt-level=3 -C panic=abort -C linker-plugin-lto -C codegen-units=1 --cfg 'feature="all"' -C metadata=4b78b189cd4beac3 -C extra-filename=-4b78b189cd4beac3 --out-dir /tmp/cargo-installQyepjN/armv7-unknown-linux-musleabi/release/deps --target armv7-unknown-linux-musleabi -C linker=armv6-linux-musleabi-gcc -L dependency=/tmp/cargo-installQyepjN/armv7-unknown-linux-musleabi/release/deps -L dependency=/tmp/cargo-installQyepjN/release/deps --extern libc=/tmp/cargo-installQyepjN/armv7-unknown-linux-musleabi/release/deps/liblibc-2305531b0b6bff17.rmeta --cap-lints allow -C relocation-model=pic -C prefer-dynamic=off -C target-feature=+crt-static,-vfp2,-vfp3` (exit code: 1) warning: build failed, waiting for other jobs to finish...
error

This was originally found in shadowsocks/shadowsocks-rust#459 .

[zonyitoo]

Changed in libc is already merged. Consider fixed the lowest libc version in the next release.

[Thomasdezeeuw]

Thanks for finding and solving the problem @zonyitoo.

[oherrala]

Sorry to borrow this issue, but I found out aarch64-unknown-linux-musl and x86_64-unknown-linux-musl targets are also broken the same way and made a pull request to libc crate to get SO_INCOMING_CPU implemented there.

PR: rust-lang/libc#2119

[fbecart]

Until the next version of libc is released, is there a known workaround, such as pinning a specific version of libc or socket2?

[Thomasdezeeuw]

@fbecart can you run cargo update, updating the libc crate? That should resolve this issue.

[fbecart]

Thank you @Thomasdezeeuw for pointing me in the right direction. I realize the problem is currently fixed for a specific set of architectures only. I'm building for i686-unknown-linux-musl, for which an issue likely still exists. I'll redirect my attention to libc.

[zonyitoo]

There are still many architectures missing SO_INCOMING_CPU in the libc crate. Could @Thomasdezeeuw make sure that all Linux-like platforms have this definition in libc?