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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