script: clang scan-build for xtensa

Add utility scripts for launching clang static analyzer.

Signed-off-by: Janusz Jankowski <janusz.jankowski@linux.intel.com>

scripts/scan/clang-scan-build-xtensa.sh

@@ -0,0 +1,96 @@
+#!/bin/bash
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright(c) 2020 Intel Corporation. All rights reserved.
+# Author: Janusz Jankowski <janusz.jankowski@linux.intel.com>
+
+# This script configures & performs build for clang's static analyzer.
+
+set -eu
+
+function usage {
+	echo "Usage: $0 -t <toolchain> -c <config> -r <root_dir> [options]"
+	echo "        -t        Toolchain's name."
+	echo "        -c        Name of defconfig."
+	echo "        -r        Xtensa root dir."
+	echo "        [-j n]    Set number of make build jobs."
+	echo "        [-v]      Verbose output."
+	echo "Examples:"
+	echo "        $0 -t xt -c apollolake \\"
+	echo "                -r \$CONFIG_PATH/xtensa-elf"
+	echo "        $0 -t xtensa-cnl-elf -c cannonlake \\"
+	echo "                -r \`pwd\`/../xtensa-cnl-elf"
+}
+
+if [ "$#" -eq 0 ]
+then
+	usage
+	exit 1
+fi
+
+TOOLCHAIN=""
+DEFCONFIG=""
+ROOT_DIR=""
+JOBS=$(nproc --all)
+VERBOSE_CMAKE=OFF
+VERBOSE_SCAN_BUILD=""
+
+while getopts "t:c:r:j:v" OPTION; do
+	case $OPTION in
+		t)
+			TOOLCHAIN=$OPTARG
+			;;
+		c)
+			DEFCONFIG=$OPTARG
+			;;
+		r)
+			ROOT_DIR=$OPTARG
+			;;
+		j)
+			JOBS=$OPTARG
+			;;
+		v)
+			VERBOSE_CMAKE=ON
+			VERBOSE_SCAN_BUILD="-v -v"
+			;;
+		*)
+			echo "Invalid options"
+			usage
+			exit 1
+			;;
+	esac
+done
+
+WORKDIR=`pwd`
+SCRIPT_DIR=$(realpath $(dirname $0))
+PROXY_COMPILER=$SCRIPT_DIR/proxy-gcc.sh
+
+BUILD_DIR=build_clang_scan_${DEFCONFIG}_${TOOLCHAIN}
+
+rm -fr $BUILD_DIR
+mkdir $BUILD_DIR
+cd $BUILD_DIR
+
+scan-build $VERBOSE_SCAN_BUILD cmake \
+	-DBUILD_CLANG_SCAN=ON \
+	-DTOOLCHAIN=$TOOLCHAIN \
+	-DROOT_DIR=$ROOT_DIR \
+	-DCMAKE_VERBOSE_MAKEFILE=$VERBOSE_CMAKE \
+	..
+
+make ${DEFCONFIG}_defconfig
+
+if [[ "$TOOLCHAIN" == "xt" ]]
+then
+	COMPILER=$TOOLCHAIN-xcc
+else
+	COMPILER=$TOOLCHAIN-gcc
+fi
+
+# There are flags that are needed by clang but don't work for xtensa compiler.
+# However clang tries to pass all flags to original compiler, so we need to put
+# proxy compiler in the middle that is going to filter out unsupported flags.
+PROXY_CC=$COMPILER PROXY_REMOVE_FLAGS=-m32 \
+	scan-build $VERBOSE_SCAN_BUILD --use-cc="$PROXY_COMPILER" -o report \
+	make sof -j$JOBS
+
+cd "$WORKDIR"

scripts/scan/proxy-gcc.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright(c) 2020 Intel Corporation. All rights reserved.
+# Author: Janusz Jankowski <janusz.jankowski@linux.intel.com>
+
+# Utility for filtering flags passed to the compiler.
+
+set -e
+
+out_args=()
+
+for arg in "$@"; do
+	for target in $PROXY_REMOVE_FLAGS; do
+		if [[ $arg = $target ]]; then
+			continue 2
+		fi
+	done
+	out_args+=("$arg")
+done
+
+
+$PROXY_CC "${out_args[@]}"