2 # SPDX-License-Identifier: GPL-2.0
4 # Tests whether a suitable Rust toolchain is available.
8 min_tool_version=$(dirname $0)/min-tool-version.sh
10 # Convert the version string x.y.z to a canonical up-to-7-digits form.
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.
15 get_canonical_version()
19 echo $((100000 * $1 + 100 * $2 + $3))
22 # Print a reference to the Quick Start guide in the documentation.
23 print_docs_reference()
26 echo >&2 "*** Please see Documentation/rust/quick-start.rst for details"
27 echo >&2 "*** on how to set up the Rust support."
31 # Print an explanation about the fact that the script is meant to be called from Kbuild.
32 print_kbuild_explanation()
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."
41 # If the script fails for any reason, or if there was any warning, then
42 # print a reference to the documentation on exit.
44 trap 'if [ $? -ne 0 ] || [ $warning -ne 0 ]; then print_docs_reference; fi' EXIT
46 # Check that the expected environment variables are set.
47 if [ -z "${RUSTC+x}" ]; then
49 echo >&2 "*** Environment variable 'RUSTC' is not set."
50 print_kbuild_explanation
53 if [ -z "${BINDGEN+x}" ]; then
55 echo >&2 "*** Environment variable 'BINDGEN' is not set."
56 print_kbuild_explanation
59 if [ -z "${CC+x}" ]; then
61 echo >&2 "*** Environment variable 'CC' is not set."
62 print_kbuild_explanation
65 # Check that the Rust compiler exists.
66 if ! command -v "$RUSTC" >/dev/null; then
68 echo >&2 "*** Rust compiler '$RUSTC' could not be found."
73 # Check that the Rust bindings generator exists.
74 if ! command -v "$BINDGEN" >/dev/null; then
76 echo >&2 "*** Rust bindings generator '$BINDGEN' could not be found."
81 # Check that the Rust compiler version is suitable.
83 # Non-stable and distributions' versions may have a version suffix, e.g. `-dev`.
84 rust_compiler_output=$( \
85 LC_ALL=C "$RUSTC" --version 2>/dev/null
86 ) || rust_compiler_code=$?
87 if [ -n "$rust_compiler_code" ]; then
89 echo >&2 "*** Running '$RUSTC' to check the Rust compiler version failed with"
90 echo >&2 "*** code $rust_compiler_code. See output and docs below for details:"
92 echo >&2 "$rust_compiler_output"
96 rust_compiler_version=$( \
97 echo "$rust_compiler_output" \
98 | sed -nE '1s:.*rustc ([0-9]+\.[0-9]+\.[0-9]+).*:\1:p'
100 if [ -z "$rust_compiler_version" ]; then
102 echo >&2 "*** Running '$RUSTC' to check the Rust compiler version did not return"
103 echo >&2 "*** an expected output. See output and docs below for details:"
105 echo >&2 "$rust_compiler_output"
109 rust_compiler_min_version=$($min_tool_version rustc)
110 rust_compiler_cversion=$(get_canonical_version $rust_compiler_version)
111 rust_compiler_min_cversion=$(get_canonical_version $rust_compiler_min_version)
112 if [ "$rust_compiler_cversion" -lt "$rust_compiler_min_cversion" ]; then
114 echo >&2 "*** Rust compiler '$RUSTC' is too old."
115 echo >&2 "*** Your version: $rust_compiler_version"
116 echo >&2 "*** Minimum version: $rust_compiler_min_version"
120 if [ "$rust_compiler_cversion" -gt "$rust_compiler_min_cversion" ]; then
122 echo >&2 "*** Rust compiler '$RUSTC' is too new. This may or may not work."
123 echo >&2 "*** Your version: $rust_compiler_version"
124 echo >&2 "*** Expected version: $rust_compiler_min_version"
129 # Check that the Rust bindings generator is suitable.
131 # Non-stable and distributions' versions may have a version suffix, e.g. `-dev`.
132 rust_bindings_generator_output=$( \
133 LC_ALL=C "$BINDGEN" --version 2>/dev/null
134 ) || rust_bindings_generator_code=$?
135 if [ -n "$rust_bindings_generator_code" ]; then
137 echo >&2 "*** Running '$BINDGEN' to check the Rust bindings generator version failed with"
138 echo >&2 "*** code $rust_bindings_generator_code. See output and docs below for details:"
140 echo >&2 "$rust_bindings_generator_output"
144 rust_bindings_generator_version=$( \
145 echo "$rust_bindings_generator_output" \
146 | sed -nE '1s:.*bindgen ([0-9]+\.[0-9]+\.[0-9]+).*:\1:p'
148 if [ -z "$rust_bindings_generator_version" ]; then
150 echo >&2 "*** Running '$BINDGEN' to check the bindings generator version did not return"
151 echo >&2 "*** an expected output. See output and docs below for details:"
153 echo >&2 "$rust_bindings_generator_output"
157 rust_bindings_generator_min_version=$($min_tool_version bindgen)
158 rust_bindings_generator_cversion=$(get_canonical_version $rust_bindings_generator_version)
159 rust_bindings_generator_min_cversion=$(get_canonical_version $rust_bindings_generator_min_version)
160 if [ "$rust_bindings_generator_cversion" -lt "$rust_bindings_generator_min_cversion" ]; then
162 echo >&2 "*** Rust bindings generator '$BINDGEN' is too old."
163 echo >&2 "*** Your version: $rust_bindings_generator_version"
164 echo >&2 "*** Minimum version: $rust_bindings_generator_min_version"
168 if [ "$rust_bindings_generator_cversion" -gt "$rust_bindings_generator_min_cversion" ]; then
170 echo >&2 "*** Rust bindings generator '$BINDGEN' is too new. This may or may not work."
171 echo >&2 "*** Your version: $rust_bindings_generator_version"
172 echo >&2 "*** Expected version: $rust_bindings_generator_min_version"
177 # Check that the `libclang` used by the Rust bindings generator is suitable.
179 # In order to do that, first invoke `bindgen` to get the `libclang` version
180 # found by `bindgen`. This step may already fail if, for instance, `libclang`
181 # is not found, thus inform the user in such a case.
182 bindgen_libclang_output=$( \
183 LC_ALL=C "$BINDGEN" $(dirname $0)/rust_is_available_bindgen_libclang.h 2>&1 >/dev/null
184 ) || bindgen_libclang_code=$?
185 if [ -n "$bindgen_libclang_code" ]; then
187 echo >&2 "*** Running '$BINDGEN' to check the libclang version (used by the Rust"
188 echo >&2 "*** bindings generator) failed with code $bindgen_libclang_code. This may be caused by"
189 echo >&2 "*** a failure to locate libclang. See output and docs below for details:"
191 echo >&2 "$bindgen_libclang_output"
196 # `bindgen` returned successfully, thus use the output to check that the version
197 # of the `libclang` found by the Rust bindings generator is suitable.
199 # Unlike other version checks, note that this one does not necessarily appear
200 # in the first line of the output, thus no `sed` address is provided.
201 bindgen_libclang_version=$( \
202 echo "$bindgen_libclang_output" \
203 | sed -nE 's:.*clang version ([0-9]+\.[0-9]+\.[0-9]+).*:\1:p'
205 if [ -z "$bindgen_libclang_version" ]; then
207 echo >&2 "*** Running '$BINDGEN' to check the libclang version (used by the Rust"
208 echo >&2 "*** bindings generator) did not return an expected output. See output"
209 echo >&2 "*** and docs below for details:"
211 echo >&2 "$bindgen_libclang_output"
215 bindgen_libclang_min_version=$($min_tool_version llvm)
216 bindgen_libclang_cversion=$(get_canonical_version $bindgen_libclang_version)
217 bindgen_libclang_min_cversion=$(get_canonical_version $bindgen_libclang_min_version)
218 if [ "$bindgen_libclang_cversion" -lt "$bindgen_libclang_min_cversion" ]; then
220 echo >&2 "*** libclang (used by the Rust bindings generator '$BINDGEN') is too old."
221 echo >&2 "*** Your version: $bindgen_libclang_version"
222 echo >&2 "*** Minimum version: $bindgen_libclang_min_version"
227 # If the C compiler is Clang, then we can also check whether its version
228 # matches the `libclang` version used by the Rust bindings generator.
230 # In the future, we might be able to perform a full version check, see
231 # https://github.com/rust-lang/rust-bindgen/issues/2138.
232 cc_name=$($(dirname $0)/cc-version.sh $CC | cut -f1 -d' ')
233 if [ "$cc_name" = Clang ]; then
235 LC_ALL=C $CC --version 2>/dev/null \
236 | sed -nE '1s:.*version ([0-9]+\.[0-9]+\.[0-9]+).*:\1:p'
238 if [ "$clang_version" != "$bindgen_libclang_version" ]; then
240 echo >&2 "*** libclang (used by the Rust bindings generator '$BINDGEN')"
241 echo >&2 "*** version does not match Clang's. This may be a problem."
242 echo >&2 "*** libclang version: $bindgen_libclang_version"
243 echo >&2 "*** Clang version: $clang_version"
249 # Check that the source code for the `core` standard library exists.
251 # `$KRUSTFLAGS` is passed in case the user added `--sysroot`.
252 rustc_sysroot=$("$RUSTC" $KRUSTFLAGS --print sysroot)
253 rustc_src=${RUST_LIB_SRC:-"$rustc_sysroot/lib/rustlib/src/rust/library"}
254 rustc_src_core="$rustc_src/core/src/lib.rs"
255 if [ ! -e "$rustc_src_core" ]; then
257 echo >&2 "*** Source code for the 'core' standard library could not be found"
258 echo >&2 "*** at '$rustc_src_core'."