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

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Message-ID: <CAJ-ks9myRR1PgER6UtkFBE_mmgA7YGFjU11+JZXbjKVcra-sfg@mail.gmail.com>
Date: Sat, 12 Oct 2024 19:52:32 -0400
From: Tamir Duberstein <tamird@...il.com>
To: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc: Daniel Gomez <da.gomez@...sung.com>, rust-for-linux@...r.kernel.org, 
	Fiona Behrens <me@...enk.dev>, Masahiro Yamada <masahiroy@...nel.org>, 
	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 Sat, Oct 12, 2024 at 7:37 PM Miguel Ojeda
<miguel.ojeda.sandonis@...il.com> wrote:
> But before we do that, is there a way to force `rustc` to load current
> name (or trick it to do so, say, with a symlink)? i.e. can it be
> reasonably done out-of-tree without changes to the filename?

I think the problem is that rustc produces .dylib on macOS rather than
it _looking_ for .dylib; the path to the .so is fully specified in the
rustc invocation of the targets that depend on it. I don't know of a way
to control the file suffix externally.

A symlink would possibly work (unless rustc refuses to load anything
other than .dylib on macOS for whatever reason), but wouldn't be very
ergonomic; you'd have to create the symlink blind or else run the build
system until it fails, then create the symlink, and then run the build
again.