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 2003-2024 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* | midnightbsd* | \
  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   # We are not on AIX, HP-UX, or IRIX. Therefore the -rpath options are
  72   # cumulative.
  73   rpath_options=
  74   saved_IFS="$IFS"; IFS=":"
  75   for dir in $library_path_value; do
  76     IFS="$saved_IFS"
  77     case "$dir" in
  78       /*)
  79         # Make dir relative to installdir. (Works only if dir is absolute.)
  80         idir="$installdir"
  81         while true; do
  82           dfirst=`echo "$dir" | sed -n -e 's,^//*\([^/]*\).*$,/\1,p'`
  83           ifirst=`echo "$idir" | sed -n -e 's,^//*\([^/]*\).*$,/\1,p'`
  84           if test -z "$dfirst" || test -z "$ifirst"; then
  85             break
  86           fi
  87           if test "$dfirst" != "$ifirst"; then
  88             break
  89           fi
  90           dir=`echo "$dir" | sed -e 's,^//*[^/]*,,'`
  91           idir=`echo "$idir" | sed -e 's,^//*[^/]*,,'`
  92         done
  93         dir="$origin_token"`echo "$idir" | sed -e 's,//*[^/]*,/..,g'`"$dir"
  94         # Augment rpath_options with dir.
  95         rpath_options="${rpath_options}${rpath_options:+ }-Wl,-rpath,$dir"
  96         ;;
  97       *)
  98         if test -n "$dir"; then
  99           echo "libdir is not absolute: $dir" 1>&2
 100         fi
 101         ;;
 102     esac
 103   done
 104   IFS="$saved_IFS"
 105   # Output it.
 106   if test -n "$rpath_options"; then
 107     case "$host_os" in
 108       # At least some versions of FreeBSD, DragonFly, and OpenBSD need the
 109       # linker option "-z origin". See <https://lekensteyn.nl/rpath.html>.
 110       freebsd* | dragonfly* | openbsd*)
 111         rpath_options="-Wl,-z,origin $rpath_options" ;;
 112     esac
 113     echo "$rpath_options"
 114   fi
 115 else
 116   echo "relocation via rpath not supported on this system: $host" 1>&2
 117   exit 1
 118 fi
 119
 120 exit 0