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1#!/bin/sh
2# SPDX-License-Identifier: GPL-2.0
3#
4# Tests whether a suitable Rust toolchain is available.
5#
6# Pass `-v` for human output and more checks (as warnings).
7
8set -e
9
10min_tool_version=$(dirname $0)/min-tool-version.sh
11
12# Convert the version string x.y.z to a canonical up-to-7-digits form.
13#
14# Note that this function uses one more digit (compared to other
15# instances in other version scripts) to give a bit more space to
16# `rustc` since it will reach 1.100.0 in late 2026.
17get_canonical_version()
18{
19 IFS=.
20 set -- $1
21 echo $((100000 * $1 + 100 * $2 + $3))
22}
23
24# Check that the Rust compiler exists.
25if ! command -v "$RUSTC" >/dev/null; then
26 if [ "$1" = -v ]; then
27 echo >&2 "***"
28 echo >&2 "*** Rust compiler '$RUSTC' could not be found."
29 echo >&2 "***"
30 fi
31 exit 1
32fi
33
34# Check that the Rust bindings generator exists.
35if ! command -v "$BINDGEN" >/dev/null; then
36 if [ "$1" = -v ]; then
37 echo >&2 "***"
38 echo >&2 "*** Rust bindings generator '$BINDGEN' could not be found."
39 echo >&2 "***"
40 fi
41 exit 1
42fi
43
44# Check that the Rust compiler version is suitable.
45#
46# Non-stable and distributions' versions may have a version suffix, e.g. `-dev`.
47rust_compiler_version=$( \
48 LC_ALL=C "$RUSTC" --version 2>/dev/null \
49 | head -n 1 \
50 | grep -oE '[0-9]+\.[0-9]+\.[0-9]+' \
51)
52rust_compiler_min_version=$($min_tool_version rustc)
53rust_compiler_cversion=$(get_canonical_version $rust_compiler_version)
54rust_compiler_min_cversion=$(get_canonical_version $rust_compiler_min_version)
55if [ "$rust_compiler_cversion" -lt "$rust_compiler_min_cversion" ]; then
56 if [ "$1" = -v ]; then
57 echo >&2 "***"
58 echo >&2 "*** Rust compiler '$RUSTC' is too old."
59 echo >&2 "*** Your version: $rust_compiler_version"
60 echo >&2 "*** Minimum version: $rust_compiler_min_version"
61 echo >&2 "***"
62 fi
63 exit 1
64fi
65if [ "$1" = -v ] && [ "$rust_compiler_cversion" -gt "$rust_compiler_min_cversion" ]; then
66 echo >&2 "***"
67 echo >&2 "*** Rust compiler '$RUSTC' is too new. This may or may not work."
68 echo >&2 "*** Your version: $rust_compiler_version"
69 echo >&2 "*** Expected version: $rust_compiler_min_version"
70 echo >&2 "***"
71fi
72
73# Check that the Rust bindings generator is suitable.
74#
75# Non-stable and distributions' versions may have a version suffix, e.g. `-dev`.
76rust_bindings_generator_version=$( \
77 LC_ALL=C "$BINDGEN" --version 2>/dev/null \
78 | head -n 1 \
79 | grep -oE '[0-9]+\.[0-9]+\.[0-9]+' \
80)
81rust_bindings_generator_min_version=$($min_tool_version bindgen)
82rust_bindings_generator_cversion=$(get_canonical_version $rust_bindings_generator_version)
83rust_bindings_generator_min_cversion=$(get_canonical_version $rust_bindings_generator_min_version)
84if [ "$rust_bindings_generator_cversion" -lt "$rust_bindings_generator_min_cversion" ]; then
85 if [ "$1" = -v ]; then
86 echo >&2 "***"
87 echo >&2 "*** Rust bindings generator '$BINDGEN' is too old."
88 echo >&2 "*** Your version: $rust_bindings_generator_version"
89 echo >&2 "*** Minimum version: $rust_bindings_generator_min_version"
90 echo >&2 "***"
91 fi
92 exit 1
93fi
94if [ "$1" = -v ] && [ "$rust_bindings_generator_cversion" -gt "$rust_bindings_generator_min_cversion" ]; then
95 echo >&2 "***"
96 echo >&2 "*** Rust bindings generator '$BINDGEN' is too new. This may or may not work."
97 echo >&2 "*** Your version: $rust_bindings_generator_version"
98 echo >&2 "*** Expected version: $rust_bindings_generator_min_version"
99 echo >&2 "***"
100fi
101
102# Check that the `libclang` used by the Rust bindings generator is suitable.
103bindgen_libclang_version=$( \
104 LC_ALL=C "$BINDGEN" $(dirname $0)/rust_is_available_bindgen_libclang.h 2>&1 >/dev/null \
105 | grep -F 'clang version ' \
106 | grep -oE '[0-9]+\.[0-9]+\.[0-9]+' \
107 | head -n 1 \
108)
109bindgen_libclang_min_version=$($min_tool_version llvm)
110bindgen_libclang_cversion=$(get_canonical_version $bindgen_libclang_version)
111bindgen_libclang_min_cversion=$(get_canonical_version $bindgen_libclang_min_version)
112if [ "$bindgen_libclang_cversion" -lt "$bindgen_libclang_min_cversion" ]; then
113 if [ "$1" = -v ]; then
114 echo >&2 "***"
115 echo >&2 "*** libclang (used by the Rust bindings generator '$BINDGEN') is too old."
116 echo >&2 "*** Your version: $bindgen_libclang_version"
117 echo >&2 "*** Minimum version: $bindgen_libclang_min_version"
118 echo >&2 "***"
119 fi
120 exit 1
121fi
122
123# If the C compiler is Clang, then we can also check whether its version
124# matches the `libclang` version used by the Rust bindings generator.
125#
126# In the future, we might be able to perform a full version check, see
127# https://github.com/rust-lang/rust-bindgen/issues/2138.
128if [ "$1" = -v ]; then
129 cc_name=$($(dirname $0)/cc-version.sh "$CC" | cut -f1 -d' ')
130 if [ "$cc_name" = Clang ]; then
131 clang_version=$( \
132 LC_ALL=C "$CC" --version 2>/dev/null \
133 | sed -nE '1s:.*version ([0-9]+\.[0-9]+\.[0-9]+).*:\1:p'
134 )
135 if [ "$clang_version" != "$bindgen_libclang_version" ]; then
136 echo >&2 "***"
137 echo >&2 "*** libclang (used by the Rust bindings generator '$BINDGEN')"
138 echo >&2 "*** version does not match Clang's. This may be a problem."
139 echo >&2 "*** libclang version: $bindgen_libclang_version"
140 echo >&2 "*** Clang version: $clang_version"
141 echo >&2 "***"
142 fi
143 fi
144fi
145
146# Check that the source code for the `core` standard library exists.
147#
148# `$KRUSTFLAGS` is passed in case the user added `--sysroot`.
149rustc_sysroot=$("$RUSTC" $KRUSTFLAGS --print sysroot)
150rustc_src=${RUST_LIB_SRC:-"$rustc_sysroot/lib/rustlib/src/rust/library"}
151rustc_src_core="$rustc_src/core/src/lib.rs"
152if [ ! -e "$rustc_src_core" ]; then
153 if [ "$1" = -v ]; then
154 echo >&2 "***"
155 echo >&2 "*** Source code for the 'core' standard library could not be found"
156 echo >&2 "*** at '$rustc_src_core'."
157 echo >&2 "***"
158 fi
159 exit 1
160fi
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_output=$( \
85 LC_ALL=C "$RUSTC" --version 2>/dev/null
86) || rust_compiler_code=$?
87if [ -n "$rust_compiler_code" ]; then
88 echo >&2 "***"
89 echo >&2 "*** Running '$RUSTC' to check the Rust compiler version failed with"
90 echo >&2 "*** code $rust_compiler_code. See output and docs below for details:"
91 echo >&2 "***"
92 echo >&2 "$rust_compiler_output"
93 echo >&2 "***"
94 exit 1
95fi
96rust_compiler_version=$( \
97 echo "$rust_compiler_output" \
98 | sed -nE '1s:.*rustc ([0-9]+\.[0-9]+\.[0-9]+).*:\1:p'
99)
100if [ -z "$rust_compiler_version" ]; then
101 echo >&2 "***"
102 echo >&2 "*** Running '$RUSTC' to check the Rust compiler version did not return"
103 echo >&2 "*** an expected output. See output and docs below for details:"
104 echo >&2 "***"
105 echo >&2 "$rust_compiler_output"
106 echo >&2 "***"
107 exit 1
108fi
109rust_compiler_min_version=$($min_tool_version rustc)
110rust_compiler_cversion=$(get_canonical_version $rust_compiler_version)
111rust_compiler_min_cversion=$(get_canonical_version $rust_compiler_min_version)
112if [ "$rust_compiler_cversion" -lt "$rust_compiler_min_cversion" ]; then
113 echo >&2 "***"
114 echo >&2 "*** Rust compiler '$RUSTC' is too old."
115 echo >&2 "*** Your version: $rust_compiler_version"
116 echo >&2 "*** Minimum version: $rust_compiler_min_version"
117 echo >&2 "***"
118 exit 1
119fi
120
121# Check that the Rust bindings generator is suitable.
122#
123# Non-stable and distributions' versions may have a version suffix, e.g. `-dev`.
124#
125# The dummy parameter `workaround-for-0.69.0` is required to support 0.69.0
126# (https://github.com/rust-lang/rust-bindgen/pull/2678). It can be removed when
127# the minimum version is upgraded past that (0.69.1 already fixed the issue).
128rust_bindings_generator_output=$( \
129 LC_ALL=C "$BINDGEN" --version workaround-for-0.69.0 2>/dev/null
130) || rust_bindings_generator_code=$?
131if [ -n "$rust_bindings_generator_code" ]; then
132 echo >&2 "***"
133 echo >&2 "*** Running '$BINDGEN' to check the Rust bindings generator version failed with"
134 echo >&2 "*** code $rust_bindings_generator_code. See output and docs below for details:"
135 echo >&2 "***"
136 echo >&2 "$rust_bindings_generator_output"
137 echo >&2 "***"
138 exit 1
139fi
140rust_bindings_generator_version=$( \
141 echo "$rust_bindings_generator_output" \
142 | sed -nE '1s:.*bindgen ([0-9]+\.[0-9]+\.[0-9]+).*:\1:p'
143)
144if [ -z "$rust_bindings_generator_version" ]; then
145 echo >&2 "***"
146 echo >&2 "*** Running '$BINDGEN' to check the bindings generator version did not return"
147 echo >&2 "*** an expected output. See output and docs below for details:"
148 echo >&2 "***"
149 echo >&2 "$rust_bindings_generator_output"
150 echo >&2 "***"
151 exit 1
152fi
153rust_bindings_generator_min_version=$($min_tool_version bindgen)
154rust_bindings_generator_cversion=$(get_canonical_version $rust_bindings_generator_version)
155rust_bindings_generator_min_cversion=$(get_canonical_version $rust_bindings_generator_min_version)
156if [ "$rust_bindings_generator_cversion" -lt "$rust_bindings_generator_min_cversion" ]; then
157 echo >&2 "***"
158 echo >&2 "*** Rust bindings generator '$BINDGEN' is too old."
159 echo >&2 "*** Your version: $rust_bindings_generator_version"
160 echo >&2 "*** Minimum version: $rust_bindings_generator_min_version"
161 echo >&2 "***"
162 exit 1
163fi
164if [ "$rust_bindings_generator_cversion" -eq 6600 ] ||
165 [ "$rust_bindings_generator_cversion" -eq 6601 ]; then
166 # Distributions may have patched the issue (e.g. Debian did).
167 if ! "$BINDGEN" $(dirname $0)/rust_is_available_bindgen_0_66.h >/dev/null; then
168 echo >&2 "***"
169 echo >&2 "*** Rust bindings generator '$BINDGEN' versions 0.66.0 and 0.66.1 may not"
170 echo >&2 "*** work due to a bug (https://github.com/rust-lang/rust-bindgen/pull/2567),"
171 echo >&2 "*** unless patched (like Debian's)."
172 echo >&2 "*** Your version: $rust_bindings_generator_version"
173 echo >&2 "***"
174 warning=1
175 fi
176fi
177
178# Check that the `libclang` used by the Rust bindings generator is suitable.
179#
180# In order to do that, first invoke `bindgen` to get the `libclang` version
181# found by `bindgen`. This step may already fail if, for instance, `libclang`
182# is not found, thus inform the user in such a case.
183bindgen_libclang_output=$( \
184 LC_ALL=C "$BINDGEN" $(dirname $0)/rust_is_available_bindgen_libclang.h 2>&1 >/dev/null
185) || bindgen_libclang_code=$?
186if [ -n "$bindgen_libclang_code" ]; then
187 echo >&2 "***"
188 echo >&2 "*** Running '$BINDGEN' to check the libclang version (used by the Rust"
189 echo >&2 "*** bindings generator) failed with code $bindgen_libclang_code. This may be caused by"
190 echo >&2 "*** a failure to locate libclang. See output and docs below for details:"
191 echo >&2 "***"
192 echo >&2 "$bindgen_libclang_output"
193 echo >&2 "***"
194 exit 1
195fi
196
197# `bindgen` returned successfully, thus use the output to check that the version
198# of the `libclang` found by the Rust bindings generator is suitable.
199#
200# Unlike other version checks, note that this one does not necessarily appear
201# in the first line of the output, thus no `sed` address is provided.
202bindgen_libclang_version=$( \
203 echo "$bindgen_libclang_output" \
204 | sed -nE 's:.*clang version ([0-9]+\.[0-9]+\.[0-9]+).*:\1:p'
205)
206if [ -z "$bindgen_libclang_version" ]; then
207 echo >&2 "***"
208 echo >&2 "*** Running '$BINDGEN' to check the libclang version (used by the Rust"
209 echo >&2 "*** bindings generator) did not return an expected output. See output"
210 echo >&2 "*** and docs below for details:"
211 echo >&2 "***"
212 echo >&2 "$bindgen_libclang_output"
213 echo >&2 "***"
214 exit 1
215fi
216bindgen_libclang_min_version=$($min_tool_version llvm)
217bindgen_libclang_cversion=$(get_canonical_version $bindgen_libclang_version)
218bindgen_libclang_min_cversion=$(get_canonical_version $bindgen_libclang_min_version)
219if [ "$bindgen_libclang_cversion" -lt "$bindgen_libclang_min_cversion" ]; then
220 echo >&2 "***"
221 echo >&2 "*** libclang (used by the Rust bindings generator '$BINDGEN') is too old."
222 echo >&2 "*** Your version: $bindgen_libclang_version"
223 echo >&2 "*** Minimum version: $bindgen_libclang_min_version"
224 echo >&2 "***"
225 exit 1
226fi
227
228if [ "$bindgen_libclang_cversion" -ge 1900100 ] &&
229 [ "$rust_bindings_generator_cversion" -lt 6905 ]; then
230 # Distributions may have patched the issue (e.g. Debian did).
231 if ! "$BINDGEN" $(dirname $0)/rust_is_available_bindgen_libclang_concat.h | grep -q foofoo; then
232 echo >&2 "***"
233 echo >&2 "*** Rust bindings generator '$BINDGEN' < 0.69.5 together with libclang >= 19.1"
234 echo >&2 "*** may not work due to a bug (https://github.com/rust-lang/rust-bindgen/pull/2824),"
235 echo >&2 "*** unless patched (like Debian's)."
236 echo >&2 "*** Your bindgen version: $rust_bindings_generator_version"
237 echo >&2 "*** Your libclang version: $bindgen_libclang_version"
238 echo >&2 "***"
239 warning=1
240 fi
241fi
242
243# If the C compiler is Clang, then we can also check whether its version
244# matches the `libclang` version used by the Rust bindings generator.
245#
246# In the future, we might be able to perform a full version check, see
247# https://github.com/rust-lang/rust-bindgen/issues/2138.
248cc_name=$($(dirname $0)/cc-version.sh $CC | cut -f1 -d' ')
249if [ "$cc_name" = Clang ]; then
250 clang_version=$( \
251 LC_ALL=C $CC --version 2>/dev/null \
252 | sed -nE '1s:.*version ([0-9]+\.[0-9]+\.[0-9]+).*:\1:p'
253 )
254 if [ "$clang_version" != "$bindgen_libclang_version" ]; then
255 echo >&2 "***"
256 echo >&2 "*** libclang (used by the Rust bindings generator '$BINDGEN')"
257 echo >&2 "*** version does not match Clang's. This may be a problem."
258 echo >&2 "*** libclang version: $bindgen_libclang_version"
259 echo >&2 "*** Clang version: $clang_version"
260 echo >&2 "***"
261 warning=1
262 fi
263fi
264
265# Check that the source code for the `core` standard library exists.
266#
267# `$KRUSTFLAGS` is passed in case the user added `--sysroot`.
268rustc_sysroot=$("$RUSTC" $KRUSTFLAGS --print sysroot)
269rustc_src=${RUST_LIB_SRC:-"$rustc_sysroot/lib/rustlib/src/rust/library"}
270rustc_src_core="$rustc_src/core/src/lib.rs"
271if [ ! -e "$rustc_src_core" ]; then
272 echo >&2 "***"
273 echo >&2 "*** Source code for the 'core' standard library could not be found"
274 echo >&2 "*** at '$rustc_src_core'."
275 echo >&2 "***"
276 exit 1
277fi