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      1 #! /bin/sh
      2 
      3 # Script to translate LDFLAGS into a form suitable for use with libtool.
      4 
      5 # Copyright (C) 2005-2014 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*|--*|-static-lib*|-shared-lib*|-B*)
     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.  Similarly for e.g. -static-libstdc++, or
     47 	    # -B/some/path.
     48 	    case $prev_arg in
     49 		-Xpreprocessor|-Xcompiler|-Xlinker)
     50 		    # This option is already prefixed; don't prefix it again.
     51 		    ;;
     52 		*)
     53 		    result="$result -Xcompiler"
     54 		    ;;
     55 	    esac
     56 	    ;;
     57 	*)
     58 	    # We do not want to add -Xcompiler to other options because
     59 	    # that would prevent libtool itself from recognizing them.
     60 	    ;;
     61     esac
     62     prev_arg=$arg
     63 
     64     # If $(LDFLAGS) is (say):
     65     #   a "b'c d" e
     66     # then the user expects that:
     67     #   $(LD) $(LDFLAGS)
     68     # will pass three arguments to $(LD):
     69     #   1) a
     70     #   2) b'c d
     71     #   3) e
     72     # We must ensure, therefore, that the arguments are appropriately
     73     # quoted so that using:
     74     #   libtool --mode=link ... $(LTLDFLAGS)
     75     # will result in the same number of arguments being passed to
     76     # libtool.   In other words, when this script was invoked, the shell 
     77     # removed one level of quoting, present in $(LDFLAGS); we have to put 
     78     # it back.
     79 
     80     # Quote any embedded single quotes.
     81     case $arg in
     82 	*"'"*)
     83 	    # The following command creates the script:
     84 	    #   1s,^X,,;s|'|'"'"'|g
     85 	    # which removes a leading X, and then quotes and embedded single
     86 	    # quotes.
     87 	    sed_script="1s,^X,,;s|'|'\"'\"'|g"
     88 	    # Add a leading "X" so that if $arg starts with a dash,
     89 	    # the echo command will not try to interpret the argument
     90 	    # as a command-line option.
     91 	    arg="X$arg"
     92 	    # Generate the quoted string.
     93 	    quoted_arg=`echo "$arg" | sed -e "$sed_script"`
     94 	    ;;
     95 	*)
     96 	    quoted_arg=$arg
     97 	    ;;
     98     esac
     99     # Surround the entire argument with single quotes.
    100     quoted_arg="'"$quoted_arg"'" 
    101 
    102     # Add it to the string.
    103     result="$result $quoted_arg"
    104 done
    105 
    106 # Output the string we have built up.
    107 echo "$result"
    108