linux-kernel - Re: [PATCH 02/17] kallsyms: increase maximum kernel symbol length to 512

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Date:   Wed, 14 Jul 2021 22:19:43 +0200
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Miguel Ojeda <ojeda@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        rust-for-linux <rust-for-linux@...r.kernel.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Geoffrey Thomas <geofft@...reload.com>,
        Finn Behrens <me@...enk.de>,
        Adam Bratschi-Kaye <ark.email@...il.com>,
        Wedson Almeida Filho <wedsonaf@...gle.com>
Subject: Re: [PATCH 02/17] kallsyms: increase maximum kernel symbol length to 512

On Wed, Jul 14, 2021 at 8:20 PM Nick Desaulniers
<ndesaulniers@...gle.com> wrote:
>
> For C++ demangling, we have c++filt.
>
> A quick search turned up: https://github.com/luser/rustfilt
>
> but if the v0 mangling scheme is upcoming, I doubt a repo that hasn't
> been updated supports an upcoming scheme.  Is there a more official
> equivalent?

Demangling v0 is already supported by the latest releases of binutils
(2.36) / gdb (10.2), e.g.:

    echo _RNvXNtCshGpAVYOtgW1_7example9my_moduleINtB2_13MyGenericTypeNtB2_6MyTypeENtB2_7MyTrait9my_method
| c++filt -i
    <example::my_module::MyGenericType<example::my_module::MyType> as
example::my_module::MyTrait>::my_method

See the current status at https://github.com/rust-lang/rust/issues/60705.

(which reminds me I have to update the "Hacking" section in the Quick
Start guide, because now the releases I backported the support into
are not needed anymore)

Cheers,
Miguel