1#!/bin/sh
2# Copyright (c) 2013 The Chromium Authors. All rights reserved.
3# Use of this source code is governed by a BSD-style license that can be
4# found in the LICENSE file.
5
6# Reads etc/ld.so.conf and/or etc/ld.so.conf.d/*.conf and returns the
7# appropriate linker flags.
8#
9#  sysroot_ld_path.sh /abspath/to/sysroot
10#
11
12log_error_and_exit() {
13  echo $0: $@
14  exit 1
15}
16
17process_entry() {
18  if [ -z "$1" ] || [ -z "$2" ]; then
19    log_error_and_exit "bad arguments to process_entry()"
20  fi
21  local root="$1"
22  local localpath="$2"
23
24  echo $localpath | grep -qs '^/'
25  if [ $? -ne 0 ]; then
26    log_error_and_exit $localpath does not start with /
27  fi
28  local entry="$root$localpath"
29  echo -L$entry
30  echo -Wl,-rpath-link=$entry
31}
32
33process_ld_so_conf() {
34  if [ -z "$1" ] || [ -z "$2" ]; then
35    log_error_and_exit "bad arguments to process_ld_so_conf()"
36  fi
37  local root="$1"
38  local ld_so_conf="$2"
39
40  # ld.so.conf may include relative include paths. pushd is a bashism.
41  local saved_pwd=$(pwd)
42  cd $(dirname "$ld_so_conf")
43
44  cat "$ld_so_conf" | \
45    while read ENTRY; do
46      echo "$ENTRY" | grep -qs ^include
47      if [ $? -eq 0 ]; then
48        local included_files=$(echo "$ENTRY" | sed 's/^include //')
49        echo "$included_files" | grep -qs ^/
50        if [ $? -eq 0 ]; then
51          if ls $root$included_files >/dev/null 2>&1 ; then
52            for inc_file in $root$included_files; do
53              process_ld_so_conf "$root" "$inc_file"
54            done
55          fi
56        else
57          if ls $(pwd)/$included_files >/dev/null 2>&1 ; then
58            for inc_file in $(pwd)/$included_files; do
59              process_ld_so_conf "$root" "$inc_file"
60            done
61          fi
62        fi
63        continue
64      fi
65
66      echo "$ENTRY" | grep -qs ^/
67      if [ $? -eq 0 ]; then
68        process_entry "$root" "$ENTRY"
69      fi
70    done
71
72  # popd is a bashism
73  cd "$saved_pwd"
74}
75
76# Main
77
78if [ $# -ne 1 ]; then
79  echo Usage $0 /abspath/to/sysroot
80  exit 1
81fi
82
83echo $1 | grep -qs ' '
84if [ $? -eq 0 ]; then
85  log_error_and_exit $1 contains whitespace.
86fi
87
88LD_SO_CONF="$1/etc/ld.so.conf"
89LD_SO_CONF_D="$1/etc/ld.so.conf.d"
90
91if [ -e "$LD_SO_CONF" ]; then
92  process_ld_so_conf "$1" "$LD_SO_CONF" | xargs echo
93elif [ -e "$LD_SO_CONF_D" ]; then
94  find "$LD_SO_CONF_D" -maxdepth 1 -name '*.conf' -print -quit > /dev/null
95  if [ $? -eq 0 ]; then
96    for entry in $LD_SO_CONF_D/*.conf; do
97      process_ld_so_conf "$1" "$entry"
98    done | xargs echo
99  fi
100fi
101