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    SubjectRe: [PATCH v8 27/31] Kbuild: add Rust support
    On Tue, Aug 2, 2022 at 3:50 AM Miguel Ojeda <ojeda@kernel.org> wrote:
    >
    > +# These flags apply to all Rust code in the tree, including the kernel and
    > +# host programs.
    > +export rust_common_flags := --edition=2021 \
    > + -Zbinary_dep_depinfo=y \
    > + -Dunsafe_op_in_unsafe_fn -Drust_2018_idioms \
    > + -Dunreachable_pub -Dnon_ascii_idents \
    > + -Wmissing_docs \
    > + -Drustdoc::missing_crate_level_docs \
    > + -Dclippy::correctness -Dclippy::style \
    > + -Dclippy::suspicious -Dclippy::complexity \
    > + -Dclippy::perf \
    > + -Dclippy::let_unit_value -Dclippy::mut_mut \
    > + -Dclippy::needless_bitwise_bool \
    > + -Dclippy::needless_continue \
    > + -Wclippy::dbg_macro

    Hi Miguel,

    I tried enabling rust support in the gcc builds I provide at
    https://mirrors.edge.kernel.org/pub/tools/crosstool/files/bin/arm64/12.1.0/
    to make this more accessible, but it appears that the command line
    options here are not portable:

    /home/arnd/cross/x86_64/gcc-12.1.0+rust-nolibc/x86_64-linux/bin/x86_64-linux-gccrs
    --edition=2021 -Zbinary_dep_depinfo=y -Dunsafe_op_in_unsafe_fn
    -Drust_2018_idioms -Dunreachable_pub -Dnon_ascii_idents -Wmissing_docs
    -Drustdoc::missing_crate_level_docs -Dclippy::correctness
    -Dclippy::style -Dclippy::suspicious -Dclippy::complexity
    -Dclippy::perf -Dclippy::let_unit_value -Dclippy::mut_mut
    -Dclippy::needless_bitwise_bool -Dclippy::needless_continue
    -Wclippy::dbg_macro -O -Cstrip=debuginfo -Zallow-features=
    --emit=dep-info,link --out-dir=scripts/
    /git/arm-soc/scripts/generate_rust_target.rs; mv
    scripts/generate_rust_target.d scripts/.generate_rust_target.d; sed -i
    '/^#/d' scripts/.generate_rust_target.d
    x86_64-linux-gccrs: error: unrecognized command-line option
    '--edition=2021'; did you mean '-frust-edition=2021'?
    x86_64-linux-gccrs: error: unrecognized command-line option
    '-Zbinary_dep_depinfo=y'
    x86_64-linux-gccrs: error: unrecognized command-line option
    '-Wmissing_docs'; did you mean '-Wmissing-braces'?
    x86_64-linux-gccrs: error: unrecognized command-line option
    '-Wclippy::dbg_macro'
    x86_64-linux-gccrs: error: unrecognized command-line option '-Cstrip=debuginfo'
    x86_64-linux-gccrs: error: unrecognized command-line option '-Zallow-features='
    x86_64-linux-gccrs: error: unrecognized command-line option
    '--emit=dep-info,link'
    x86_64-linux-gccrs: error: unrecognized command-line option '--out-dir=scripts/'
    make[3]: *** [/git/arm-soc/scripts/Makefile.host:157:
    scripts/generate_rust_target] Error 1

    I guess nobody has tried this so far. Would you think that fixing this is only
    a matter for fixing the build system to pass the correct flags depending on the
    compiler, or is this broken in a more fundamental way?

    Arnd

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