1#!/bin/sh 2# SPDX-License-Identifier: GPL-2.0 3# 4# Tests whether a suitable Rust toolchain is available. 5 6set -e 7 8min_tool_version=$(dirname $0)/min-tool-version.sh 9 10# Convert the version string x.y.z to a canonical up-to-7-digits form. 11# 12# Note that this function uses one more digit (compared to other 13# instances in other version scripts) to give a bit more space to 14# `rustc` since it will reach 1.100.0 in late 2026. 15get_canonical_version() 16{ 17 IFS=. 18 set -- $1 19 echo $((100000 * $1 + 100 * $2 + $3)) 20} 21 22# Print a reference to the Quick Start guide in the documentation. 23print_docs_reference() 24{ 25 echo >&2 "***" 26 echo >&2 "*** Please see Documentation/rust/quick-start.rst for details" 27 echo >&2 "*** on how to set up the Rust support." 28 echo >&2 "***" 29} 30 31# Print an explanation about the fact that the script is meant to be called from Kbuild. 32print_kbuild_explanation() 33{ 34 echo >&2 "***" 35 echo >&2 "*** This script is intended to be called from Kbuild." 36 echo >&2 "*** Please use the 'rustavailable' target to call it instead." 37 echo >&2 "*** Otherwise, the results may not be meaningful." 38 exit 1 39} 40 41# If the script fails for any reason, or if there was any warning, then 42# print a reference to the documentation on exit. 43warning=0 44trap 'if [ $? -ne 0 ] || [ $warning -ne 0 ]; then print_docs_reference; fi' EXIT 45 46# Check that the expected environment variables are set. 47if [ -z "${RUSTC+x}" ]; then 48 echo >&2 "***" 49 echo >&2 "*** Environment variable 'RUSTC' is not set." 50 print_kbuild_explanation 51fi 52 53if [ -z "${BINDGEN+x}" ]; then 54 echo >&2 "***" 55 echo >&2 "*** Environment variable 'BINDGEN' is not set." 56 print_kbuild_explanation 57fi 58 59if [ -z "${CC+x}" ]; then 60 echo >&2 "***" 61 echo >&2 "*** Environment variable 'CC' is not set." 62 print_kbuild_explanation 63fi 64 65# Check that the Rust compiler exists. 66if ! command -v "$RUSTC" >/dev/null; then 67 echo >&2 "***" 68 echo >&2 "*** Rust compiler '$RUSTC' could not be found." 69 echo >&2 "***" 70 exit 1 71fi 72 73# Check that the Rust bindings generator exists. 74if ! command -v "$BINDGEN" >/dev/null; then 75 echo >&2 "***" 76 echo >&2 "*** Rust bindings generator '$BINDGEN' could not be found." 77 echo >&2 "***" 78 exit 1 79fi 80 81# Check that the Rust compiler version is suitable. 82# 83# Non-stable and distributions' versions may have a version suffix, e.g. `-dev`. 84rust_compiler_version=$( \ 85 LC_ALL=C "$RUSTC" --version 2>/dev/null \ 86 | head -n 1 \ 87 | grep -oE '[0-9]+\.[0-9]+\.[0-9]+' \ 88) 89rust_compiler_min_version=$($min_tool_version rustc) 90rust_compiler_cversion=$(get_canonical_version $rust_compiler_version) 91rust_compiler_min_cversion=$(get_canonical_version $rust_compiler_min_version) 92if [ "$rust_compiler_cversion" -lt "$rust_compiler_min_cversion" ]; then 93 echo >&2 "***" 94 echo >&2 "*** Rust compiler '$RUSTC' is too old." 95 echo >&2 "*** Your version: $rust_compiler_version" 96 echo >&2 "*** Minimum version: $rust_compiler_min_version" 97 echo >&2 "***" 98 exit 1 99fi 100if [ "$rust_compiler_cversion" -gt "$rust_compiler_min_cversion" ]; then 101 echo >&2 "***" 102 echo >&2 "*** Rust compiler '$RUSTC' is too new. This may or may not work." 103 echo >&2 "*** Your version: $rust_compiler_version" 104 echo >&2 "*** Expected version: $rust_compiler_min_version" 105 echo >&2 "***" 106 warning=1 107fi 108 109# Check that the Rust bindings generator is suitable. 110# 111# Non-stable and distributions' versions may have a version suffix, e.g. `-dev`. 112rust_bindings_generator_version=$( \ 113 LC_ALL=C "$BINDGEN" --version 2>/dev/null \ 114 | head -n 1 \ 115 | grep -oE '[0-9]+\.[0-9]+\.[0-9]+' \ 116) 117rust_bindings_generator_min_version=$($min_tool_version bindgen) 118rust_bindings_generator_cversion=$(get_canonical_version $rust_bindings_generator_version) 119rust_bindings_generator_min_cversion=$(get_canonical_version $rust_bindings_generator_min_version) 120if [ "$rust_bindings_generator_cversion" -lt "$rust_bindings_generator_min_cversion" ]; then 121 echo >&2 "***" 122 echo >&2 "*** Rust bindings generator '$BINDGEN' is too old." 123 echo >&2 "*** Your version: $rust_bindings_generator_version" 124 echo >&2 "*** Minimum version: $rust_bindings_generator_min_version" 125 echo >&2 "***" 126 exit 1 127fi 128if [ "$rust_bindings_generator_cversion" -gt "$rust_bindings_generator_min_cversion" ]; then 129 echo >&2 "***" 130 echo >&2 "*** Rust bindings generator '$BINDGEN' is too new. This may or may not work." 131 echo >&2 "*** Your version: $rust_bindings_generator_version" 132 echo >&2 "*** Expected version: $rust_bindings_generator_min_version" 133 echo >&2 "***" 134 warning=1 135fi 136 137# Check that the `libclang` used by the Rust bindings generator is suitable. 138# 139# In order to do that, first invoke `bindgen` to get the `libclang` version 140# found by `bindgen`. This step may already fail if, for instance, `libclang` 141# is not found, thus inform the user in such a case. 142bindgen_libclang_output=$( \ 143 LC_ALL=C "$BINDGEN" $(dirname $0)/rust_is_available_bindgen_libclang.h 2>&1 >/dev/null 144) || bindgen_libclang_code=$? 145if [ -n "$bindgen_libclang_code" ]; then 146 echo >&2 "***" 147 echo >&2 "*** Running '$BINDGEN' to check the libclang version (used by the Rust" 148 echo >&2 "*** bindings generator) failed with code $bindgen_libclang_code. This may be caused by" 149 echo >&2 "*** a failure to locate libclang. See output and docs below for details:" 150 echo >&2 "***" 151 echo >&2 "$bindgen_libclang_output" 152 echo >&2 "***" 153 exit 1 154fi 155 156# `bindgen` returned successfully, thus use the output to check that the version 157# of the `libclang` found by the Rust bindings generator is suitable. 158bindgen_libclang_version=$( \ 159 echo "$bindgen_libclang_output" \ 160 | grep -F 'clang version ' \ 161 | grep -oE '[0-9]+\.[0-9]+\.[0-9]+' \ 162 | head -n 1 \ 163) 164bindgen_libclang_min_version=$($min_tool_version llvm) 165bindgen_libclang_cversion=$(get_canonical_version $bindgen_libclang_version) 166bindgen_libclang_min_cversion=$(get_canonical_version $bindgen_libclang_min_version) 167if [ "$bindgen_libclang_cversion" -lt "$bindgen_libclang_min_cversion" ]; then 168 echo >&2 "***" 169 echo >&2 "*** libclang (used by the Rust bindings generator '$BINDGEN') is too old." 170 echo >&2 "*** Your version: $bindgen_libclang_version" 171 echo >&2 "*** Minimum version: $bindgen_libclang_min_version" 172 echo >&2 "***" 173 exit 1 174fi 175 176# If the C compiler is Clang, then we can also check whether its version 177# matches the `libclang` version used by the Rust bindings generator. 178# 179# In the future, we might be able to perform a full version check, see 180# https://github.com/rust-lang/rust-bindgen/issues/2138. 181cc_name=$($(dirname $0)/cc-version.sh $CC | cut -f1 -d' ') 182if [ "$cc_name" = Clang ]; then 183 clang_version=$( \ 184 LC_ALL=C $CC --version 2>/dev/null \ 185 | sed -nE '1s:.*version ([0-9]+\.[0-9]+\.[0-9]+).*:\1:p' 186 ) 187 if [ "$clang_version" != "$bindgen_libclang_version" ]; then 188 echo >&2 "***" 189 echo >&2 "*** libclang (used by the Rust bindings generator '$BINDGEN')" 190 echo >&2 "*** version does not match Clang's. This may be a problem." 191 echo >&2 "*** libclang version: $bindgen_libclang_version" 192 echo >&2 "*** Clang version: $clang_version" 193 echo >&2 "***" 194 warning=1 195 fi 196fi 197 198# Check that the source code for the `core` standard library exists. 199# 200# `$KRUSTFLAGS` is passed in case the user added `--sysroot`. 201rustc_sysroot=$("$RUSTC" $KRUSTFLAGS --print sysroot) 202rustc_src=${RUST_LIB_SRC:-"$rustc_sysroot/lib/rustlib/src/rust/library"} 203rustc_src_core="$rustc_src/core/src/lib.rs" 204if [ ! -e "$rustc_src_core" ]; then 205 echo >&2 "***" 206 echo >&2 "*** Source code for the 'core' standard library could not be found" 207 echo >&2 "*** at '$rustc_src_core'." 208 echo >&2 "***" 209 exit 1 210fi 211