1#!/bin/sh
2# Update abilist files based on differences on one architecture.
3# Copyright (C) 2015-2022 Free Software Foundation, Inc.
4# This file is part of the GNU C Library.
5#
6# The GNU C Library is free software; you can redistribute it and/or
7# modify it under the terms of the GNU Lesser General Public
8# License as published by the Free Software Foundation; either
9# version 2.1 of the License, or (at your option) any later version.
10#
11# The GNU C Library is distributed in the hope that it will be useful,
12# but WITHOUT ANY WARRANTY; without even the implied warranty of
13# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14# Lesser General Public License for more details.
15#
16# You should have received a copy of the GNU Lesser General Public
17# License along with the GNU C Library; if not, see
18# <https://www.gnu.org/licenses/>.
19
20set -e
21export LC_ALL=C
22
23if [ $# -lt 2 ]; then
24  echo "usage: $0 OLD-FILE NEW-FILE FILES-TO-BE-PATCHED..." 1>&2
25  exit 2
26elif [ $# -eq 2 ]; then
27  echo "info: no files to patch" 1>&2
28  exit 0
29fi
30
31old_file="$1"
32shift
33new_file="$1"
34shift
35
36tmp_old_sorted="$(mktemp)"
37tmp_new_sorted="$(mktemp)"
38tmp_new_symbols="$(mktemp)"
39tmp_patched="$(mktemp)"
40
41cleanup () {
42  rm -f -- "$tmp_old_sorted" "$tmp_new_sorted" \
43    "$tmp_new_symbols" "$tmp_patched"
44}
45
46trap cleanup 0
47
48sort -u -o "$tmp_old_sorted" -- "$old_file"
49sort -u -o "$tmp_new_sorted" -- "$new_file"
50
51# -1 skips symbols only in $old_file (deleted symbols).
52# -3 skips symbols in both files (unchanged symbols).
53comm -1 -3 "$tmp_old_sorted" "$tmp_new_sorted" > "$tmp_new_symbols"
54
55new_symbol_count="$(wc -l < "$tmp_new_symbols")"
56if [ "$new_symbol_count" -eq 0 ]; then
57  echo "info: no symbols added" 1>&2
58  exit 0
59fi
60
61echo "info: $new_symbol_count symbol(s) added" 1>&2
62
63for to_be_patched in "$@" ; do
64  sort -u -o "$tmp_patched" -- "$to_be_patched" "$tmp_new_symbols"
65  if ! cmp -s -- "$to_be_patched" "$tmp_patched"; then
66    echo "info: updating $to_be_patched" 1>&2
67    cp -- "$tmp_patched" "$to_be_patched"
68  fi
69done
70