Linking rust code results in `library not found: gcc` about mold

[expenses]

That works! Thanks!

[rui314]

Could you try setting linker to just ld?

linker = "ld"

I believe the above configuration won't work as well, because linker should be set to a compiler driver (e.g. gcc or clang) instead of a linker command itself (e.g. ld or mold).

If you undo your changes to use mold and instead run cargo build as mold -run cargo build, does that work? If a build command is run as mold -run <command>, all invocations of /usr/bin/ld, /usr/bin/ld.gold or /usr/bin/ld.lld are replaced with mold.

[expenses]

Hmm, with

[target.x86_64-unknown-linux-gnu]
rustflags = [
    "-C", "link-arg=-L/usr/lib",
]
linker = "ld"

and running mold -run cargo run I get the same

  = note: mold: library not found: gcc

error.
The ld/mold command that's run seems to be the same.

[rui314]

Please remove rustflags and linker from ~/.cargo/config and run mold -run cargo run. In other words, you don't have to edit your cargo config file to use mold. Just run mold -run cargo run without changing any config file.

Generally, linker in a cargo config file is expected to set to gcc or clang. If you set it to ld, lld or anything else, that will fail.