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 2003-2019 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: $installdir" 1>&2
  52     exit 1
  53     ;;
  54 esac
  55
  56 case "$host_os" in
  57   linux* | kfreebsd*)
  58     rpath=
  59     save_IFS="$IFS"; IFS=":"
  60     for dir in $library_path_value; do
  61       IFS="$save_IFS"
  62       case "$dir" in
  63         /*)
  64           # Make dir relative to installdir. (Works only if dir is absolute.)
  65           idir="$installdir"
  66           while true; do
  67             dfirst=`echo "$dir" | sed -n -e 's,^//*\([^/]*\).*$,/\1,p'`
  68             ifirst=`echo "$idir" | sed -n -e 's,^//*\([^/]*\).*$,/\1,p'`
  69             if test -z "$dfirst" || test -z "$ifirst"; then
  70               break
  71             fi
  72             if test "$dfirst" != "$ifirst"; then
  73               break
  74             fi
  75             dir=`echo "$dir" | sed -e 's,^//*[^/]*,,'`
  76             idir=`echo "$idir" | sed -e 's,^//*[^/]*,,'`
  77           done
  78           dir="\$ORIGIN"`echo "$idir" | sed -e 's,//*[^/]*,/..,g'`"$dir"
  79           # Add dir to rpath.
  80           rpath="${rpath}${rpath:+ }$dir"
  81           ;;
  82         *)
  83           if test -n "$dir"; then
  84             echo "libdir is not absolute: $dir" 1>&2
  85           fi
  86           ;;
  87       esac
  88     done
  89     IFS="$save_IFS"
  90     # Output it.
  91     if test -n "$rpath"; then
  92       echo "-Wl,-rpath,$rpath"
  93     fi
  94     ;;
  95   *)
  96     echo "relocation via rpath not supported on this system: $host" 1>&2
  97     exit 1
  98     ;;
  99 esac
 100
 101 exit 0