.rust.o.cmd: No such file or directory

[Skallwar]

Hello,

While trying to build, I get this error:
.rust.o.cmd: No such file or directory

Linux version: uname -r = 5.10.19-1-lts

[jbaublitz]

Can you please show me how you're invoking the build?

[Skallwar]

Can you please show me how you're invoking the build?

I just ran make after setting up nightly as my default toolchain

[jbaublitz]

I can't reproduce this on my system. I've been digging into out of tree kernel module builds so I'll update you with more information as I come up with it.

[joroec]

There was a kernel commit (around version 5.8), not sure exactly, that changed a missing .o.cmd file from a warning to an error.
I can reproduce the error on an Ubuntu 20.04 system (kernel 5.8.0-50-generic #56~20.04.1-Ubuntu SMP Mon Apr 12 21:46:35 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux) with Rust toolchain rustc 1.53.0-nightly (6df26f897 2021-04-20).
A quick fix is to generate the empty file manually. This tells Kbuild that there are no build dependencies for this file:

touch src/.rust.o.cmd

and repeat the build with make. The build should now succeed.

Here are some more information.

Note, however, that the toolchain rustc 1.53.0-nightly (6df26f897 2021-04-20) still generates wrong relocation symbols. See this issue for more information.

[jbaublitz]

Fixed by 449c36d.