build-aux/reloc-ldflags

   1 #! /bin/sh
   2 # Output a system dependent linker command for putting a relocatable library
   3 # search path into an executable.
   4 #
   5 #   Copyright 2003-2020 Free Software Foundation, Inc.
   6 #   Written by Bruno Haible <bruno@clisp.org>, 2003.
   7 #
   8 #   This program is free software: you can redistribute it and/or modify
   9 #   it under the terms of the GNU General Public License as published by
  10 #   the Free Software Foundation; either version 3 of the License, or
  11 #   (at your option) any later version.
  12 #
  13 #   This program is distributed in the hope that it will be useful,
  14 #   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 #   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 #   GNU General Public License for more details.
  17 #
  18 #   You should have received a copy of the GNU General Public License
  19 #   along with this program.  If not, see <https://www.gnu.org/licenses/>.
  20 #
  21 #   As a special exception to the GNU General Public License, if you
  22 #   distribute this file as part of a program that contains a
  23 #   configuration script generated by Autoconf, you may include it under
  24 #   the same distribution terms that you use for the rest of that program.
  25 #
  26 # The first argument passed to this file is the canonical host specification,
  27 #    CPU_TYPE-MANUFACTURER-OPERATING_SYSTEM
  28 # or
  29 #    CPU_TYPE-MANUFACTURER-KERNEL-OPERATING_SYSTEM
  30 # The environment variable LD should be set by the caller.
  31 #
  32 # The second argument is a colon separated list of directories that contain
  33 # the libraries at installation time.
  34 #
  35 # The third argument is the directory into which the executable is going to be
  36 # installed.
  37
  38 host="$1"
  39 host_cpu=`echo "$host" | sed 's/^\([^-]*\)-\([^-]*\)-\(.*\)$/\1/'`
  40 host_vendor=`echo "$host" | sed 's/^\([^-]*\)-\([^-]*\)-\(.*\)$/\2/'`
  41 host_os=`echo "$host" | sed 's/^\([^-]*\)-\([^-]*\)-\(.*\)$/\3/'`
  42
  43 library_path_value=$2
  44
  45 installdir=$3
  46
  47 # Verify that installdir is absolute.
  48 case "$installdir" in
  49   /*) ;;
  50   *)
  51     echo "installdir is not absolute: $installdir" 1>&2
  52     exit 1
  53     ;;
  54 esac
  55
  56 origin_token=
  57 case "$host_os" in
  58   linux* | gnu* | kfreebsd* | \
  59   freebsd* | dragonfly* | \
  60   netbsd* | \
  61   openbsd* | \
  62   solaris* | \
  63   haiku*)
  64     origin_token='$ORIGIN'
  65     ;;
  66   darwin*)
  67     origin_token='@loader_path'
  68     ;;
  69 esac
  70 if test -n "$origin_token"; then
  71   rpath=
  72   save_IFS="$IFS"; IFS=":"
  73   for dir in $library_path_value; do
  74     IFS="$save_IFS"
  75     case "$dir" in
  76       /*)
  77         # Make dir relative to installdir. (Works only if dir is absolute.)
  78         idir="$installdir"
  79         while true; do
  80           dfirst=`echo "$dir" | sed -n -e 's,^//*\([^/]*\).*$,/\1,p'`
  81           ifirst=`echo "$idir" | sed -n -e 's,^//*\([^/]*\).*$,/\1,p'`
  82           if test -z "$dfirst" || test -z "$ifirst"; then
  83             break
  84           fi
  85           if test "$dfirst" != "$ifirst"; then
  86             break
  87           fi
  88           dir=`echo "$dir" | sed -e 's,^//*[^/]*,,'`
  89           idir=`echo "$idir" | sed -e 's,^//*[^/]*,,'`
  90         done
  91         dir="$origin_token"`echo "$idir" | sed -e 's,//*[^/]*,/..,g'`"$dir"
  92         # Add dir to rpath.
  93         rpath="${rpath}${rpath:+ }$dir"
  94         ;;
  95       *)
  96         if test -n "$dir"; then
  97           echo "libdir is not absolute: $dir" 1>&2
  98         fi
  99         ;;
 100     esac
 101   done
 102   IFS="$save_IFS"
 103   # Output it.
 104   if test -n "$rpath"; then
 105     case "$host_os" in
 106       # At least some versions of FreeBSD, DragonFly, and OpenBSD need the
 107       # linker option "-z origin". See <https://lekensteyn.nl/rpath.html>.
 108       freebsd* | dragonfly* | openbsd*)
 109         echo "-Wl,-z,origin -Wl,-rpath,$rpath" ;;
 110       *)
 111         echo "-Wl,-rpath,$rpath" ;;
 112     esac
 113   fi
 114 else
 115   echo "relocation via rpath not supported on this system: $host" 1>&2
 116   exit 1
 117 fi
 118
 119 exit 0