#!/bin/sh# SPDX-License-Identifier: GPL-2.0## Tests whether a suitable Rust toolchain is available.## Pass `-v` for human output and more checks (as warnings). set -e min_tool_version=$(dirname $0)/min-tool-version.sh # 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 + $3))} # Check that the Rust compiler exists.if ! command -v "$RUSTC" >/dev/null; then	if [ "$1" = -v ]; then		echo >&2 "***"		echo >&2 "*** Rust compiler '$RUSTC' could not be found."		echo >&2 "***"	fi	exit 1fi # Check that the Rust bindings generator exists.if ! command -v "$BINDGEN" >/dev/null; then	if [ "$1" = -v ]; then		echo >&2 "***"		echo >&2 "*** Rust bindings generator '$BINDGEN' could not be found."		echo >&2 "***"	fi	exit 1fi # Check that the Rust compiler version is suitable.## Non-stable and distributions' versions may have a version suffix, e.g. `-dev`.rust_compiler_version=$( \	LC_ALL=C "$RUSTC" --version 2>/dev/null \		| head -n 1 \		| grep -oE '[0-9]+\.[0-9]+\.[0-9]+' \)rust_compiler_min_version=$($min_tool_version rustc)rust_compiler_cversion=$(get_canonical_version $rust_compiler_version)rust_compiler_min_cversion=$(get_canonical_version $rust_compiler_min_version)if [ "$rust_compiler_cversion" -lt "$rust_compiler_min_cversion" ]; then	if [ "$1" = -v ]; then		echo >&2 "***"		echo >&2 "*** Rust compiler '$RUSTC' is too old."		echo >&2 "***   Your version:    $rust_compiler_version"		echo >&2 "***   Minimum version: $rust_compiler_min_version"		echo >&2 "***"	fi	exit 1fiif [ "$1" = -v ] && [ "$rust_compiler_cversion" -gt "$rust_compiler_min_cversion" ]; then	echo >&2 "***"	echo >&2 "*** Rust compiler '$RUSTC' is too new. This may or may not work."	echo >&2 "***   Your version:     $rust_compiler_version"	echo >&2 "***   Expected version: $rust_compiler_min_version"	echo >&2 "***"fi # Check that the Rust bindings generator is suitable.## Non-stable and distributions' versions may have a version suffix, e.g. `-dev`.rust_bindings_generator_version=$( \	LC_ALL=C "$BINDGEN" --version 2>/dev/null \		| head -n 1 \		| grep -oE '[0-9]+\.[0-9]+\.[0-9]+' \)rust_bindings_generator_min_version=$($min_tool_version bindgen)rust_bindings_generator_cversion=$(get_canonical_version $rust_bindings_generator_version)rust_bindings_generator_min_cversion=$(get_canonical_version $rust_bindings_generator_min_version)if [ "$rust_bindings_generator_cversion" -lt "$rust_bindings_generator_min_cversion" ]; then	if [ "$1" = -v ]; then		echo >&2 "***"		echo >&2 "*** Rust bindings generator '$BINDGEN' is too old."		echo >&2 "***   Your version:    $rust_bindings_generator_version"		echo >&2 "***   Minimum version: $rust_bindings_generator_min_version"		echo >&2 "***"	fi	exit 1fiif [ "$1" = -v ] && [ "$rust_bindings_generator_cversion" -gt "$rust_bindings_generator_min_cversion" ]; then	echo >&2 "***"	echo >&2 "*** Rust bindings generator '$BINDGEN' is too new. This may or may not work."	echo >&2 "***   Your version:     $rust_bindings_generator_version"	echo >&2 "***   Expected version: $rust_bindings_generator_min_version"	echo >&2 "***"fi # Check that the `libclang` used by the Rust bindings generator is suitable.bindgen_libclang_version=$( \	LC_ALL=C "$BINDGEN" $(dirname $0)/rust_is_available_bindgen_libclang.h 2>&1 >/dev/null \		| grep -F 'clang version ' \		| grep -oE '[0-9]+\.[0-9]+\.[0-9]+' \		| head -n 1 \)bindgen_libclang_min_version=$($min_tool_version llvm)bindgen_libclang_cversion=$(get_canonical_version $bindgen_libclang_version)bindgen_libclang_min_cversion=$(get_canonical_version $bindgen_libclang_min_version)if [ "$bindgen_libclang_cversion" -lt "$bindgen_libclang_min_cversion" ]; then	if [ "$1" = -v ]; then		echo >&2 "***"		echo >&2 "*** libclang (used by the Rust bindings generator '$BINDGEN') is too old."		echo >&2 "***   Your version:    $bindgen_libclang_version"		echo >&2 "***   Minimum version: $bindgen_libclang_min_version"		echo >&2 "***"	fi	exit 1fi # If the C compiler is Clang, then we can also check whether its version# matches the `libclang` version used by the Rust bindings generator.## In the future, we might be able to perform a full version check, see# https://github.com/rust-lang/rust-bindgen/issues/2138.if [ "$1" = -v ]; then	cc_name=$($(dirname $0)/cc-version.sh "$CC" | cut -f1 -d' ')	if [ "$cc_name" = Clang ]; then		clang_version=$( \			LC_ALL=C "$CC" --version 2>/dev/null \				| sed -nE '1s:.*version ([0-9]+\.[0-9]+\.[0-9]+).*:\1:p'		)		if [ "$clang_version" != "$bindgen_libclang_version" ]; then			echo >&2 "***"			echo >&2 "*** libclang (used by the Rust bindings generator '$BINDGEN')"			echo >&2 "*** version does not match Clang's. This may be a problem."			echo >&2 "***   libclang version: $bindgen_libclang_version"			echo >&2 "***   Clang version:    $clang_version"			echo >&2 "***"		fi	fifi # Check that the source code for the `core` standard library exists.## `$KRUSTFLAGS` is passed in case the user added `--sysroot`.rustc_sysroot=$("$RUSTC" $KRUSTFLAGS --print sysroot)rustc_src=${RUST_LIB_SRC:-"$rustc_sysroot/lib/rustlib/src/rust/library"}rustc_src_core="$rustc_src/core/src/lib.rs"if [ ! -e "$rustc_src_core" ]; then	if [ "$1" = -v ]; then		echo >&2 "***"		echo >&2 "*** Source code for the 'core' standard library could not be found"		echo >&2 "*** at '$rustc_src_core'."		echo >&2 "***"	fi	exit 1fi