error[E0432]: unresolved import std::sync::atomic::AtomicU64

[andreas-schwab]

https://build.opensuse.org/package/live_build_log/home:Andreas_Schwab:Factory/rust/p/ppc

Dist RLS stage2 (powerpc-unknown-linux-gnu)
Building stage2 tool clippy-driver (powerpc-unknown-linux-gnu)
Finished release [optimized] target(s) in 0.59s
Building stage2 tool rls (powerpc-unknown-linux-gnu)
Compiling rls v1.35.0 (/home/abuild/rpmbuild/BUILD/rustc-1.35.0-src/src/tools
/rls)
error[E0432]: unresolved import std::sync::atomic::AtomicU64
--> src/tools/rls/rls/src/cmd.rs:10:25
|
10 | use std::sync::atomic::{AtomicU64, Ordering};
| ^^^^^^^^^
| |
| no AtomicU64 in sync::atomic
| help: a similar name exists in the module: AtomicU16

error[E0432]: unresolved import std::sync::atomic::AtomicU64
--> src/tools/rls/rls/src/server/io.rs:10:25
|
10 | use std::sync::atomic::{AtomicU64, Ordering};
| ^^^^^^^^^
| |
| no AtomicU64 in sync::atomic
| help: a similar name exists in the module: AtomicU16

error: aborting due to 2 previous errors

For more information about this error, try rustc --explain E0432.
error: Could not compile rls.

To learn more, run the command again with --verbose.
command did not execute successfully: "/home/abuild/rpmbuild/BUILD/rust-1.35.0-powerpc-unknown-linux-gnu/usr/bin/cargo" "build" "--target" "powerpc-unknown-linux-gnu" "-j" "8" "--release" "--frozen" "--manifest-path" "/home/abuild/rpmbuild/BUILD/rustc-1.35.0-src/src/tools/rls/Cargo.toml" "--features" "clippy" "--message-format" "json"
expected success, got: exit code: 101
thread 'main' panicked at 'Unable to build RLS', src/bootstrap/dist.rs:65:9
note: Run with RUST_BACKTRACE=1 environment variable to display a backtrace.
failed to run: /home/abuild/rpmbuild/BUILD/rustc-1.35.0-src/build/bootstrap/debug/bootstrap install

[jonas-schievink]

A PowerPC miscompilation I guess?

[hellow554]

@andreas-schwab please put the error output into a region surrounded by three backticks (```)

[mati865]

Enabling RLS tool requires platform to have 64 bit atomics available which isn't true on 32 bit PowerPC.
You can either disable RLS on affected platforms or patch it to work with 32 bit atomics, related RLS PR: rust-lang/rls#910

[hellow554]

https://doc.rust-lang.org/std/sync/atomic/index.html#portability

PowerPC and MIPS platforms with 32-bit pointers do not have AtomicU64 or AtomicI64 types.

[jonas-schievink]

Okay, closing as an expected build failure then. Please open an issue on the RLS repo if this needs fixing.