As noted in https://github.com/rust-lang/rust/pull/132975#issuecomment-2484645240, the default for userland apps is to follow the architecture defaults, the -funsigned-char flag only applies to kernel builds.
As noted in https://github.com/rust-lang/rust/pull/132975#issuecomment-2484645240, the default for userland apps is to follow the architecture defaults, the -funsigned-char flag only applies to kernel builds.