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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 613fe16923
("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: Nicolas Schier <nicolas@fjasle.eu>
Tested-by: Alice Ryhl <aliceryhl@google.com>
Acked-by: Masahiro Yamada <masahiroy@kernel.org>
Link: https://lore.kernel.org/r/20240902165535.1101978-2-ojeda@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
26 lines
598 B
Bash
Executable file
26 lines
598 B
Bash
Executable file
#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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#
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# Usage: $ ./rustc-version.sh rustc
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#
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# Print the Rust compiler version in a 6 or 7-digit form.
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# Convert the version string x.y.z to a canonical up-to-7-digits form.
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#
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# Note that this function uses one more digit (compared to other
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# instances in other version scripts) to give a bit more space to
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# `rustc` since it will reach 1.100.0 in late 2026.
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get_canonical_version()
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{
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IFS=.
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set -- $1
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echo $((100000 * $1 + 100 * $2 + $3))
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}
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if output=$("$@" --version 2>/dev/null); then
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set -- $output
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get_canonical_version $2
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else
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echo 0
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exit 1
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fi
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