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
  35 for arg
  36 do
  37     case $arg in
  38         -f*|--*)
  39             # Libtool does not ascribe any special meaning options
  40             # that begin with -f or with a double-dash.  So, it will
  41             # think these options are linker options, and prefix them
  42             # with "-Wl,".  Then, the compiler driver will ignore the
  43             # options.  So, we prefix these options with -Xcompiler to
  44             # make clear to libtool that they are in fact compiler
  45             # options.
  46             result="$result -Xcompiler"
  47             ;;
  48         *)
  49             # We do not want to add -Xcompiler to other options because
  50             # that would prevent libtool itself from recognizing them.
  51             ;;
  52     esac
  53
  54     # If $(LDFLAGS) is (say):
  55     #   a "b'c d" e
  56     # then the user expects that:
  57     #   $(LD) $(LDFLAGS)
  58     # will pass three arguments to $(LD):
  59     #   1) a
  60     #   2) b'c d
  61     #   3) e
  62     # We must ensure, therefore, that the arguments are appropriately
  63     # quoted so that using:
  64     #   libtool --mode=link ... $(LTLDFLAGS)
  65     # will result in the same number of arguments being passed to
  66     # libtool.   In other words, when this script was invoked, the shell
  67     # removed one level of quoting, present in $(LDFLAGS); we have to put
  68     # it back.
  69
  70     # Quote any embedded single quotes.
  71     case $arg in
  72         *"'"*)
  73             # The following command creates the script:
  74             #   1s,^X,,;s|'|'"'"'|g
  75             # which removes a leading X, and then quotes and embedded single
  76             # quotes.
  77             sed_script="1s,^X,,;s|'|'\"'\"'|g"
  78             # Add a leading "X" so that if $arg starts with a dash,
  79             # the echo command will not try to interpret the argument
  80             # as a command-line option.
  81             arg="X$arg"
  82             # Generate the quoted string.
  83             quoted_arg=`echo "$arg" | sed -e "$sed_script"`
  84             ;;
  85         *)
  86             quoted_arg=$arg
  87             ;;
  88     esac
  89     # Surround the entire argument with single quotes.
  90     quoted_arg="'"$quoted_arg"'"
  91
  92     # Add it to the string.
  93     result="$result $quoted_arg"
  94 done
  95
  96 # Output the string we have built up.
  97 echo "$result"