libtool-ldflags

   1 #! /bin/sh
   2
   3 # Script to translate LDFLAGS into a form suitable for use with libtool.
   4
   5 # Copyright (C) 2005 Free Software Foundation, Inc.
   6 #
   7 # This file is free software; you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation; either version 2 of the License, or
  10 # (at your option) any later version.
  11 #
  12 # This program is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with this program; if not, write to the Free Software
  19 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  20 # MA 02110-1301, USA.
  21
  22 # Contributed by CodeSourcery, LLC.
  23
  24 # This script is designed to be used from a Makefile that uses libtool
  25 # to build libraries as follows:
  26 #
  27 #   LTLDFLAGS = $(shell libtool-ldflags $(LDFLAGS))
  28 #
  29 # Then, use (LTLDFLAGS) in place of $(LDFLAGS) in your link line.
  30
  31 # The output of the script.  This string is built up as we process the
  32 # arguments.
  33 result=
  34 prev_arg=
  35
  36 for arg
  37 do
  38     case $arg in
  39         -f*|--*)
  40             # Libtool does not ascribe any special meaning options
  41             # that begin with -f or with a double-dash.  So, it will
  42             # think these options are linker options, and prefix them
  43             # with "-Wl,".  Then, the compiler driver will ignore the
  44             # options.  So, we prefix these options with -Xcompiler to
  45             # make clear to libtool that they are in fact compiler
  46             # options.
  47             case $prev_arg in
  48                 -Xpreprocessor|-Xcompiler|-Xlinker)
  49                     # This option is already prefixed; don't prefix it again.
  50                     ;;
  51                 *)
  52                     result="$result -Xcompiler"
  53                     ;;
  54             esac
  55             ;;
  56         *)
  57             # We do not want to add -Xcompiler to other options because
  58             # that would prevent libtool itself from recognizing them.
  59             ;;
  60     esac
  61     prev_arg=$arg
  62
  63     # If $(LDFLAGS) is (say):
  64     #   a "b'c d" e
  65     # then the user expects that:
  66     #   $(LD) $(LDFLAGS)
  67     # will pass three arguments to $(LD):
  68     #   1) a
  69     #   2) b'c d
  70     #   3) e
  71     # We must ensure, therefore, that the arguments are appropriately
  72     # quoted so that using:
  73     #   libtool --mode=link ... $(LTLDFLAGS)
  74     # will result in the same number of arguments being passed to
  75     # libtool.   In other words, when this script was invoked, the shell
  76     # removed one level of quoting, present in $(LDFLAGS); we have to put
  77     # it back.
  78
  79     # Quote any embedded single quotes.
  80     case $arg in
  81         *"'"*)
  82             # The following command creates the script:
  83             #   1s,^X,,;s|'|'"'"'|g
  84             # which removes a leading X, and then quotes and embedded single
  85             # quotes.
  86             sed_script="1s,^X,,;s|'|'\"'\"'|g"
  87             # Add a leading "X" so that if $arg starts with a dash,
  88             # the echo command will not try to interpret the argument
  89             # as a command-line option.
  90             arg="X$arg"
  91             # Generate the quoted string.
  92             quoted_arg=`echo "$arg" | sed -e "$sed_script"`
  93             ;;
  94         *)
  95             quoted_arg=$arg
  96             ;;
  97     esac
  98     # Surround the entire argument with single quotes.
  99     quoted_arg="'"$quoted_arg"'"
 100
 101     # Add it to the string.
 102     result="$result $quoted_arg"
 103 done
 104
 105 # Output the string we have built up.
 106 echo "$result"