1 #!/bin/sh
2 # SPDX-License-Identifier: GPL-2.0
3 #
4 # Print the C compiler name and its version in a 5 or 6-digit form.
5 # Also, perform the minimum version check.
6
7 set -e
8
9 # Print the C compiler name and some version components.
10 get_c_compiler_info()
11 {
12 cat <<- EOF | "$@" -E -P -x c - 2>/dev/null
13 #if defined(__clang__)
14 Clang __clang_major__ __clang_minor__ __clang_patchlevel__
15 #elif defined(__GNUC__)
16 GCC __GNUC__ __GNUC_MINOR__ __GNUC_PATCHLEVEL__
17 #else
18 unknown
19 #endif
20 EOF
21 }
22
23 # Convert the version string x.y.z to a canonical 5 or 6-digit form.
24 get_canonical_version()
25 {
26 IFS=.
27 set -- $1
28 echo $((10000 * $1 + 100 * $2 + $3))
29 }
30
31 # $@ instead of $1 because multiple words might be given, e.g. CC="ccache gcc".
32 orig_args="$@"
33 set -- $(get_c_compiler_info "$@")
34
35 name=$1
36
37 min_tool_version=$(dirname $0)/min-tool-version.sh
38
39 case "$name" in
40 GCC)
41 version=$2.$3.$4
42 min_version=$($min_tool_version gcc)
43 ;;
44 Clang)
45 version=$2.$3.$4
46 min_version=$($min_tool_version llvm)
47 ;;
48 *)
49 echo "$orig_args: unknown C compiler" >&2
50 exit 1
51 ;;
52 esac
53
54 cversion=$(get_canonical_version $version)
55 min_cversion=$(get_canonical_version $min_version)
56
57 if [ "$cversion" -lt "$min_cversion" ]; then
58 echo >&2 "***"
59 echo >&2 "*** C compiler is too old."
60 echo >&2 "*** Your $name version: $version"
61 echo >&2 "*** Minimum $name version: $min_version"
62 echo >&2 "***"
63 exit 1
64 fi
65
66 echo $name $cversion
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