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#!/bin/sh # SPDX-License-Identifier: GPL-2.0-only # Script to update include/generated/autoksyms.h and dependency files # # Copyright: (C) 2016 Linaro Limited # Created by: Nicolas Pitre, January 2016 # # Update the include/generated/autoksyms.h file. # # For each symbol being added or removed, the corresponding dependency # file's timestamp is updated to force a rebuild of the affected source # file. All arguments passed to this script are assumed to be a command # to be exec'd to trigger a rebuild of those files. set -e cur_ksyms_file="include/generated/autoksyms.h" new_ksyms_file="include/generated/autoksyms.h.tmpnew" info() { if [ "$quiet" != "silent_" ]; then printf " %-7s %s\n" "$1" "$2" fi } info "CHK" "$cur_ksyms_file" # Use "make V=1" to debug this script. case "$KBUILD_VERBOSE" in *1*) set -x ;; esac # Generate a new symbol list file $CONFIG_SHELL $srctree/scripts/gen_autoksyms.sh "$new_ksyms_file" # Extract changes between old and new list and touch corresponding # dependency files. changed=$( count=0 sort "$cur_ksyms_file" "$new_ksyms_file" | uniq -u | sed -n 's/^#define __KSYM_\(.*\) 1/\1/p' | while read sympath; do if [ -z "$sympath" ]; then continue; fi depfile="include/ksym/${sympath}" mkdir -p "$(dirname "$depfile")" touch "$depfile" # Filesystems with coarse time precision may create timestamps # equal to the one from a file that was very recently built and that # needs to be rebuild. Let's guard against that by making sure our # dep files are always newer than the first file we created here. while [ ! "$depfile" -nt "$new_ksyms_file" ]; do touch "$depfile" done echo $((count += 1)) done | tail -1 ) changed=${changed:-0} if [ $changed -gt 0 ]; then # Replace the old list with tne new one old=$(grep -c "^#define __KSYM_" "$cur_ksyms_file" || true) new=$(grep -c "^#define __KSYM_" "$new_ksyms_file" || true) info "KSYMS" "symbols: before=$old, after=$new, changed=$changed" info "UPD" "$cur_ksyms_file" mv -f "$new_ksyms_file" "$cur_ksyms_file" # Then trigger a rebuild of affected source files exec $@ else rm -f "$new_ksyms_file" fi