kbuild: check the minimum compiler version in Kconfig

[linux-2.6-microblaze.git] / scripts / cc-version.sh

diff --git a/scripts/cc-version.sh b/scripts/cc-version.sh
new file mode 100755 (executable)
index 0000000..3f2ee88
--- /dev/null
+++ b/scripts/cc-version.sh
@@ -0,0 +1,82 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+#
+# Print the compiler name and its version in a 5 or 6-digit form.
+# Also, perform the minimum version check.
+
+set -e
+
+# When you raise the minimum compiler version, please update
+# Documentation/process/changes.rst as well.
+gcc_min_version=4.9.0
+clang_min_version=10.0.1
+icc_min_version=16.0.3 # temporary
+
+# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63293
+# https://lore.kernel.org/r/20210107111841.GN1551@shell.armlinux.org.uk
+if [ "$SRCARCH" = arm64 ]; then
+       gcc_min_version=5.1.0
+fi
+
+# Print the compiler name and some version components.
+get_compiler_info()
+{
+       cat <<- EOF | "$@" -E -P -x c - 2>/dev/null
+       #if defined(__clang__)
+       Clang   __clang_major__  __clang_minor__  __clang_patchlevel__
+       #elif defined(__INTEL_COMPILER)
+       ICC     __INTEL_COMPILER  __INTEL_COMPILER_UPDATE
+       #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 -- $(get_compiler_info "$@")
+
+name=$1
+
+case "$name" in
+GCC)
+       version=$2.$3.$4
+       min_version=$gcc_min_version
+       ;;
+Clang)
+       version=$2.$3.$4
+       min_version=$clang_min_version
+       ;;
+ICC)
+       version=$(($2 / 100)).$(($2 % 100)).$3
+       min_version=$icc_min_version
+       ;;
+*)
+       echo "$orig_args: unknown compiler" >&2
+       exit 1
+       ;;
+esac
+
+cversion=$(get_canonical_version $version)
+min_cversion=$(get_canonical_version $min_version)
+
+if [ "$cversion" -lt "$min_cversion" ]; then
+       echo >&2 "***"
+       echo >&2 "*** 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