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Diffstat (limited to '')
-rwxr-xr-x | scripts/adjust_autoksyms.sh | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/scripts/adjust_autoksyms.sh b/scripts/adjust_autoksyms.sh new file mode 100755 index 000000000..2b366d945 --- /dev/null +++ b/scripts/adjust_autoksyms.sh @@ -0,0 +1,76 @@ +#!/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 "$KBUILD_VERBOSE" in +*1*) + set -x + ;; +esac + +# We need access to CONFIG_ symbols +. include/config/auto.conf + +# Generate a new symbol list file +$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' | tr "A-Z_" "a-z/" | +while read sympath; do + if [ -z "$sympath" ]; then continue; fi + depfile="include/ksym/${sympath}.h" + 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 |