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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
#
# Print the C compiler name and its version in a 5 or 6-digit form.
# Also, perform the minimum version check.
set -e
# Print the C compiler name and some version components.
get_c_compiler_info()
{
cat <<- EOF | "$@" -E -P -x c - 2>/dev/null
#if defined(__clang__)
Clang __clang_major__ __clang_minor__ __clang_patchlevel__
#elif defined(__GNUC__)
GCC __GNUC__ __GNUC_MINOR__ __GNUC_PATCHLEVEL__
#else
unknown
#endif
EOF
}
# Convert the version string x.y.z to a canonical 5 or 6-digit form.
get_canonical_version()
{
IFS=.
set -- $1
echo $((10000 * $1 + 100 * $2 + $3))
}
# $@ instead of $1 because multiple words might be given, e.g. CC="ccache gcc".
orig_args="$@"
set -- $(get_c_compiler_info "$@")
name=$1
min_tool_version=$(dirname $0)/min-tool-version.sh
case "$name" in
GCC)
version=$2.$3.$4
min_version=$($min_tool_version gcc)
;;
Clang)
version=$2.$3.$4
min_version=$($min_tool_version llvm)
;;
*)
echo "$orig_args: unknown C compiler" >&2
exit 1
;;
esac
cversion=$(get_canonical_version $version)
min_cversion=$(get_canonical_version $min_version)
if [ "$cversion" -lt "$min_cversion" ]; then
echo >&2 "***"
echo >&2 "*** C compiler is too old."
echo >&2 "*** Your $name version: $version"
echo >&2 "*** Minimum $name version: $min_version"
echo >&2 "***"
exit 1
fi
echo $name $cversion