linux-kernel - Re: [PATCH] rust: query the compiler for dylib path

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Message-ID: <CANiq72n6zkCZdUJ0A8enLW3BgmA_=eJKgDKwNCfs-q3dfeR2BA@mail.gmail.com>
Date: Mon, 14 Oct 2024 21:08:58 +0200
From: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To: Masahiro Yamada <masahiroy@...nel.org>
Cc: Tamir Duberstein <tamird@...il.com>, Daniel Gomez <da.gomez@...sung.com>, 
	rust-for-linux@...r.kernel.org, Fiona Behrens <me@...enk.dev>, 
	Nathan Chancellor <nathan@...nel.org>, Nicolas Schier <nicolas@...sle.eu>, Miguel Ojeda <ojeda@...nel.org>, 
	Alex Gaynor <alex.gaynor@...il.com>, Boqun Feng <boqun.feng@...il.com>, 
	Gary Guo <gary@...yguo.net>, Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
	Benno Lossin <benno.lossin@...ton.me>, Andreas Hindborg <a.hindborg@...nel.org>, 
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>, 
	"David S. Miller" <davem@...emloft.net>, Kris Van Hees <kris.van.hees@...cle.com>, 
	Íñigo Huguet <ihuguet@...hat.com>, 
	Thomas Weißschuh <linux@...ssschuh.net>, 
	Vegard Nossum <vegard.nossum@...cle.com>, 
	Laurent Pinchart <laurent.pinchart@...asonboard.com>, linux-kernel@...r.kernel.org, 
	linux-kbuild@...r.kernel.org
Subject: Re: [PATCH] rust: query the compiler for dylib path

On Mon, Oct 14, 2024 at 8:46 PM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> rustc ignores --emit=link=rust/libmacro.so
> and produces rust/libmacro.dylib.
>
> Is this a bug in rustc?

Hmm... From a quick test in Linux and macOS (in a GitHub runner):

    uname
    echo | rustc --crate-type=proc-macro --emit=link=a.so -
    echo | rustc --crate-type=proc-macro --emit=link=b.dylib -
    file a.so
    file b.dylib

gives:

    Darwin
    a.so: Mach-O 64-bit dynamically linked shared library arm64
    b.dylib: Mach-O 64-bit dynamically linked shared library arm64

    Linux
    a.so: ELF 64-bit LSB shared object, x86-64, version 1...
    b.dylib: ELF 64-bit LSB shared object, x86-64, version 1...

Cheers,
Miguel