#!/bin/sh# SPDX-License-Identifier: GPL-2.0-onlyset -e # Argument 1: Source file to build.IN="$1"shift# Extract just the filename for error messages below.FILE="${IN##*/}"# Extract the function name for error messages below.FUNC="${FILE#*-}"FUNC="${FUNC%%-*}"FUNC="${FUNC%%.*}"# Extract the symbol to test for in build/symbol test below.WANT="__${FILE%%-*}" # Argument 2: Where to write the build log.OUT="$1"shiftTMP="${OUT}.tmp" # Argument 3: Path to "nm" tool.NM="$1"shift # Remaining arguments are: $(CC) $(c_flags) # Clean up temporary file at exit.__cleanup() {	rm -f "$TMP"}trap __cleanup EXIT # Function names in warnings are wrapped in backticks under UTF-8 locales.# Run the commands with LANG=C so that grep output will not change.export LANG=C status=# Attempt to build a source that is expected to fail with a specific warning.if "$@" -Werror -c "$IN" -o "$OUT".o 2> "$TMP" ; then	# If the build succeeds, either the test has failed or the	# warning may only happen at link time (Clang). In that case,	# make sure the expected symbol is unresolved in the symbol list.	# If so, FORTIFY is working for this case.	if ! $NM -A "$OUT".o | grep -m1 "\bU ${WANT}$" >>"$TMP" ; then		status="warning: unsafe ${FUNC}() usage lacked '$WANT' symbol in $IN"	fielse	# If the build failed, check for the warning in the stderr (gcc).	if ! grep -q -m1 "error: call to .\b${WANT}\b." "$TMP" ; then		status="warning: unsafe ${FUNC}() usage lacked '$WANT' warning in $IN"	fifi if [ -n "$status" ]; then	# Report on failure results, including compilation warnings.	echo "$status" | tee "$OUT" >&2else	# Report on good results, and save any compilation output to log.	echo "ok: unsafe ${FUNC}() usage correctly detected with '$WANT' in $IN" >"$OUT"ficat "$TMP" >>"$OUT"