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
 7set -e
 8
 9# Print the C compiler name and some version components.
10get_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.
24get_canonical_version()
25{
26	IFS=.
27	set -- $1
28	echo $((10000 * $1 + 100 * $2 + $3))
29}
30
31# $@ instead of $1 because multiple words might be given, e.g. CC="ccache gcc".
32orig_args="$@"
33set -- $(get_c_compiler_info "$@")
34
35name=$1
36
37min_tool_version=$(dirname $0)/min-tool-version.sh
38
39case "$name" in
40GCC)
41	version=$2.$3.$4
42	min_version=$($min_tool_version gcc)
43	;;
44Clang)
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	;;
52esac
53
54cversion=$(get_canonical_version $version)
55min_cversion=$(get_canonical_version $min_version)
56
57if [ "$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
64fi
65
66echo $name $cversion