Commit 6e74c6b5 authored by Miguel Ojeda's avatar Miguel Ojeda
Browse files

kbuild: rust: add `CONFIG_RUSTC_VERSION` 

Now that we support several Rust versions, introduce
`CONFIG_RUSTC_VERSION` so that it can be used in Kconfig to enable and
disable configuration options based on the `rustc` version.

The approach taken resembles `pahole`'s -- see commit 613fe169
("kbuild: Add CONFIG_PAHOLE_VERSION"), i.e. a simple version parsing
without trying to identify several kinds of compilers, since so far
there is only one (`rustc`).

However, unlike `pahole`'s, we also print a zero if executing failed for
any reason, rather than checking if the command is found and executable
(which still leaves things like a file that exists and is executable,
but e.g. is built for another platform [1]). An equivalent approach to
the one here was also submitted for `pahole` [2].

Link: https://lore.kernel.org/rust-for-linux/CANiq72=4vX_tJMJLE6e+bg7ZECHkS-AQpm8GBzuK75G1EB7+Nw@mail.gmail.com/ [1]
Link: https://lore.kernel.org/linux-kbuild/20240728125527.690726-1-ojeda@kernel.org/

 [2]
Reviewed-by: default avatarNicolas Schier <nicolas@fjasle.eu>
Tested-by: default avatarAlice Ryhl <aliceryhl@google.com>
Acked-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
Link: https://lore.kernel.org/r/20240902165535.1101978-2-ojeda@kernel.org


Signed-off-by: default avatarMiguel Ojeda <ojeda@kernel.org>
parent ab309b6e

init/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -60,6 +60,13 @@ config LLD_VERSION 
	default $(ld-version) if LD_IS_LLD

	default 0



config RUSTC_VERSION

	int

	default $(shell,$(srctree)/scripts/rustc-version.sh $(RUSTC))

	help

	  It does not depend on `RUST` since that one may need to use the version

	  in a `depends on`.



config RUST_IS_AVAILABLE

	def_bool $(success,$(srctree)/scripts/rust_is_available.sh)

	help

scripts/rustc-version.sh

0 → 100755
+26 −0
Original line number Diff line number Diff line 
#!/bin/sh

# SPDX-License-Identifier: GPL-2.0

#

# Usage: $ ./rustc-version.sh rustc

#

# Print the Rust compiler version in a 6 or 7-digit form.



# Convert the version string x.y.z to a canonical up-to-7-digits form.

#

# Note that this function uses one more digit (compared to other

# instances in other version scripts) to give a bit more space to

# `rustc` since it will reach 1.100.0 in late 2026.

get_canonical_version()

{

	IFS=.

	set -- $1

	echo $((100000 * $1 + 100 * $2 + $3))

}



if output=$("$@" --version 2>/dev/null); then

	set -- $output

	get_canonical_version $2

else

	echo 0

	exit 1

fi