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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
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: $rust_compiler_min_version"
117 echo >&2 "***"
118 exit 1
119fi
120if [ "$rust_compiler_cversion" -gt "$rust_compiler_min_cversion" ]; then
121 echo >&2 "***"
122 echo >&2 "*** Rust compiler '$RUSTC' is too new. This may or may not work."
123 echo >&2 "*** Your version: $rust_compiler_version"
124 echo >&2 "*** Expected version: $rust_compiler_min_version"
125 echo >&2 "***"
126 warning=1
127fi
128
129# Check that the Rust bindings generator is suitable.
130#
131# Non-stable and distributions' versions may have a version suffix, e.g. `-dev`.
132rust_bindings_generator_output=$( \
133 LC_ALL=C "$BINDGEN" --version 2>/dev/null
134) || rust_bindings_generator_code=$?
135if [ -n "$rust_bindings_generator_code" ]; then
136 echo >&2 "***"
137 echo >&2 "*** Running '$BINDGEN' to check the Rust bindings generator version failed with"
138 echo >&2 "*** code $rust_bindings_generator_code. See output and docs below for details:"
139 echo >&2 "***"
140 echo >&2 "$rust_bindings_generator_output"
141 echo >&2 "***"
142 exit 1
143fi
144rust_bindings_generator_version=$( \
145 echo "$rust_bindings_generator_output" \
146 | sed -nE '1s:.*bindgen ([0-9]+\.[0-9]+\.[0-9]+).*:\1:p'
147)
148if [ -z "$rust_bindings_generator_version" ]; then
149 echo >&2 "***"
150 echo >&2 "*** Running '$BINDGEN' to check the bindings generator version did not return"
151 echo >&2 "*** an expected output. See output and docs below for details:"
152 echo >&2 "***"
153 echo >&2 "$rust_bindings_generator_output"
154 echo >&2 "***"
155 exit 1
156fi
157rust_bindings_generator_min_version=$($min_tool_version bindgen)
158rust_bindings_generator_cversion=$(get_canonical_version $rust_bindings_generator_version)
159rust_bindings_generator_min_cversion=$(get_canonical_version $rust_bindings_generator_min_version)
160if [ "$rust_bindings_generator_cversion" -lt "$rust_bindings_generator_min_cversion" ]; then
161 echo >&2 "***"
162 echo >&2 "*** Rust bindings generator '$BINDGEN' is too old."
163 echo >&2 "*** Your version: $rust_bindings_generator_version"
164 echo >&2 "*** Minimum version: $rust_bindings_generator_min_version"
165 echo >&2 "***"
166 exit 1
167fi
168if [ "$rust_bindings_generator_cversion" -gt "$rust_bindings_generator_min_cversion" ]; then
169 echo >&2 "***"
170 echo >&2 "*** Rust bindings generator '$BINDGEN' is too new. This may or may not work."
171 echo >&2 "*** Your version: $rust_bindings_generator_version"
172 echo >&2 "*** Expected version: $rust_bindings_generator_min_version"
173 echo >&2 "***"
174 warning=1
175fi
176
177# Check that the `libclang` used by the Rust bindings generator is suitable.
178#
179# In order to do that, first invoke `bindgen` to get the `libclang` version
180# found by `bindgen`. This step may already fail if, for instance, `libclang`
181# is not found, thus inform the user in such a case.
182bindgen_libclang_output=$( \
183 LC_ALL=C "$BINDGEN" $(dirname $0)/rust_is_available_bindgen_libclang.h 2>&1 >/dev/null
184) || bindgen_libclang_code=$?
185if [ -n "$bindgen_libclang_code" ]; then
186 echo >&2 "***"
187 echo >&2 "*** Running '$BINDGEN' to check the libclang version (used by the Rust"
188 echo >&2 "*** bindings generator) failed with code $bindgen_libclang_code. This may be caused by"
189 echo >&2 "*** a failure to locate libclang. See output and docs below for details:"
190 echo >&2 "***"
191 echo >&2 "$bindgen_libclang_output"
192 echo >&2 "***"
193 exit 1
194fi
195
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.
198#
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.
201bindgen_libclang_version=$( \
202 echo "$bindgen_libclang_output" \
203 | sed -nE 's:.*clang version ([0-9]+\.[0-9]+\.[0-9]+).*:\1:p'
204)
205if [ -z "$bindgen_libclang_version" ]; then
206 echo >&2 "***"
207 echo >&2 "*** Running '$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:"
210 echo >&2 "***"
211 echo >&2 "$bindgen_libclang_output"
212 echo >&2 "***"
213 exit 1
214fi
215bindgen_libclang_min_version=$($min_tool_version llvm)
216bindgen_libclang_cversion=$(get_canonical_version $bindgen_libclang_version)
217bindgen_libclang_min_cversion=$(get_canonical_version $bindgen_libclang_min_version)
218if [ "$bindgen_libclang_cversion" -lt "$bindgen_libclang_min_cversion" ]; then
219 echo >&2 "***"
220 echo >&2 "*** libclang (used by the Rust bindings generator '$BINDGEN') is too old."
221 echo >&2 "*** Your version: $bindgen_libclang_version"
222 echo >&2 "*** Minimum version: $bindgen_libclang_min_version"
223 echo >&2 "***"
224 exit 1
225fi
226
227# If the C compiler is Clang, then we can also check whether its version
228# matches the `libclang` version used by the Rust bindings generator.
229#
230# In the future, we might be able to perform a full version check, see
231# https://github.com/rust-lang/rust-bindgen/issues/2138.
232cc_name=$($(dirname $0)/cc-version.sh $CC | cut -f1 -d' ')
233if [ "$cc_name" = Clang ]; then
234 clang_version=$( \
235 LC_ALL=C $CC --version 2>/dev/null \
236 | sed -nE '1s:.*version ([0-9]+\.[0-9]+\.[0-9]+).*:\1:p'
237 )
238 if [ "$clang_version" != "$bindgen_libclang_version" ]; then
239 echo >&2 "***"
240 echo >&2 "*** libclang (used by the Rust bindings generator '$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: $clang_version"
244 echo >&2 "***"
245 warning=1
246 fi
247fi
248
249# Check that the source code for the `core` standard library exists.
250#
251# `$KRUSTFLAGS` is passed in case the user added `--sysroot`.
252rustc_sysroot=$("$RUSTC" $KRUSTFLAGS --print sysroot)
253rustc_src=${RUST_LIB_SRC:-"$rustc_sysroot/lib/rustlib/src/rust/library"}
254rustc_src_core="$rustc_src/core/src/lib.rs"
255if [ ! -e "$rustc_src_core" ]; then
256 echo >&2 "***"
257 echo >&2 "*** Source code for the 'core' standard library could not be found"
258 echo >&2 "*** at '$rustc_src_core'."
259 echo >&2 "***"
260 exit 1
261fi
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