gcc/genmultilib

   1 #!/bin/sh
   2 # Generates multilib.h.
   3 #   Copyright (C) 1994 Free Software Foundation, Inc.
   4
   5 #This file is part of GNU CC.
   6
   7 #GNU CC 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, or (at your option)
  10 #any later version.
  11
  12 #GNU CC 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 GNU CC; see the file COPYING.  If not, write to
  19 #the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  20
  21 # This shell script produces a header file which the gcc driver
  22 # program uses to pick which library to use based on the machine
  23 # specific options that it is given.
  24
  25 # The first argument is a list of sets of options.  The elements in
  26 # the list are separated by spaces.  Within an element, the options
  27 # are separated by slashes.  No leading dash is used on the options.
  28 # Each option in a set is mutually incompatible with all other options
  29 # in the set.
  30
  31 # The optional second argument is a list of subdirectory names.  If
  32 # the second argument is non-empty, there must be as many elements in
  33 # the second argument as there are options in the first argument.  The
  34 # elements in the second list are separated by spaces.  If the second
  35 # argument is empty, the option names will be used as the directory
  36 # names.
  37
  38 # The optional third argument is a list of options which are
  39 # identical.  The elements in the list are separated by spaces.  Each
  40 # element must be of the form OPTION=OPTION.  The first OPTION should
  41 # appear in the first argument, and the second should be a synonym for
  42 # it.
  43
  44 # The output looks like
  45 #   #define MULTILIB_MATCHES "\
  46 #   SUBDIRECTORY OPTIONS;\
  47 #   ...
  48 #   "
  49 # The SUBDIRECTORY is the subdirectory to use.  The OPTIONS are
  50 # multiple options separated by spaces.  Each option may start with an
  51 # exclamation point.  gcc will consider each line in turn.  If none of
  52 # the options beginning with an exclamation point are present, and all
  53 # of the other options are present, that subdirectory will be used.
  54 # The order of the subdirectories is such that they can be created in
  55 # order; that is, a subdirectory is preceded by all its parents.
  56
  57 # Here is a example (this is simplified from the actual 680x0 case):
  58 #   genmultilib "m68000/m68020 msoft-float" "m68000 m68020 msoft-float"
  59 #               "m68000=mc68000"
  60 # This produces:
  61 #   #define MULTILIB_MATCHES "\
  62 #   m68000/msoft-float m68000 msoft-float;\
  63 #   m68000/msoft-float mc68000 msoft-float;\
  64 #   m68020/msoft-float m68020 msoft-float;\
  65 #   msoft-float !m68000 !mc68000 !m68020 msoft-float;\
  66 #   m68000 m68000 !msoft-float;\
  67 #   m68000 mc60000 !msoft-float;\
  68 #   m68020 m68020 !msoft-float;\
  69 #   . !m68000 !mc68000 !m68020 !msoft-float;\
  70 #   "
  71 # The effect is that `gcc -msoft-float' (for example) will append
  72 # msoft-float to the directory name when searching for libraries or
  73 # startup files, and `gcc -m68000 -msoft-float' (for example) will
  74 # append m68000/msoft-float.
  75
  76 # Copy the positional parameters into variables.
  77 options=$1
  78 dirnames=$2
  79 matches=$3
  80
  81 # What we want to do is select all combinations of the sets in
  82 # options.  Each combination which includes a set of mutually
  83 # exclusive options must then be output multiple times, once for each
  84 # item in the set.  Selecting combinations is a recursive process.
  85 # Since not all versions of sh support functions, we achieve recursion
  86 # by creating a temporary shell script which invokes itself.
  87 rm -f tmpmultilib
  88 cat >tmpmultilib <<\EOF
  89 #!/bin/sh
  90 # This recursive script basically outputs all combinations of its
  91 # input arguments, handling mutually exclusive sets of options by
  92 # repetition.  When the script is called, ${initial} is the list of
  93 # options which should appear before all combinations this will
  94 # output.  The output looks like a list of subdirectory names with
  95 # leading and trailing slashes.
  96 if [ "$#" != "0" ]; then
  97   first=$1
  98   shift
  99   for opt in `echo $first | sed -e 's|/| |'g`; do
 100     echo ${initial}${opt}/
 101   done
 102   ./tmpmultilib $@
 103   for opt in `echo $first | sed -e 's|/| |'g`; do
 104     initial="${initial}${opt}/" ./tmpmultilib $@
 105   done
 106 fi
 107 EOF
 108 chmod +x tmpmultilib
 109
 110 combinations=`initial=/ ./tmpmultilib ${options}`
 111
 112 rm -f tmpmultilib
 113
 114 # Construct a sed pattern which will convert option names to directory
 115 # names.
 116 todirnames=
 117 if [ -n "${dirnames}" ]; then
 118   set x ${dirnames}
 119   shift
 120   for set in ${options}; do
 121     for opt in `echo ${set} | sed -e 's|/| |'g`; do
 122       if [ "$1" != "${opt}" ]; then
 123         todirnames="${todirnames} -e s|/${opt}/|/${1}/|g"
 124       fi
 125       shift
 126     done
 127   done
 128 fi
 129
 130 # Construct a sed pattern which will add negations based on the
 131 # matches.  The semicolons are easier than getting the shell to accept
 132 # quoted spaces when expanding a variable.
 133 matchnegations=
 134 for i in ${matches}; do
 135   l=`echo $i | sed -e 's/=.*$//'`
 136   r=`echo $i | sed -e 's/^.*=//'`
 137   matchnegations="${matchnegations} -e s/;!${l};/;!${l};!${r};/"
 138 done
 139
 140 # We need another recursive shell script to correctly handle positive
 141 # matches.  If we are invoked as
 142 #   genmultilib "opt1 opt2" "" "opt1=nopt1 opt2=nopt2"
 143 # we must output
 144 #   opt1/opt2 opt1 opt2
 145 #   opt1/opt2 nopt1 opt2
 146 #   opt1/opt2 opt1 nopt2
 147 #   opt1/opt2 nopt1 nopt2
 148 # In other words, we must output all combinations of matches.
 149 rm -f tmpmultilib2
 150 cat >tmpmultilib2 <<\EOF
 151 #!/bin/sh
 152 # The positional parameters are a list of matches to consider.
 153 # ${dirout} is the directory name and ${optout} is the current list of
 154 # options.
 155 if [ "$#" = "0" ]; then
 156   echo "${dirout} ${optout};\\"
 157 else
 158   first=$1
 159   shift
 160   dirout="${dirout}" optout="${optout}" ./tmpmultilib2 $@
 161   l=`echo ${first} | sed -e 's/=.*$//'`
 162   r=`echo ${first} | sed -e 's/^.*=//'`
 163   case " ${optout} " in
 164   *" ${l} "*)
 165     newopt=`echo " ${optout} " | sed -e "s/ ${l} / ${r} /" -e 's/^ //' -e 's/ $//'`
 166     dirout="${dirout}" optout="${newopt}" ./tmpmultilib2 $@
 167     ;;
 168   esac
 169 fi
 170 EOF
 171 chmod +x tmpmultilib2
 172
 173 # We are ready to start output.
 174 echo '#define MULTILIB_SELECT "\'
 175
 176 # Start with the current directory, which includes only negations.
 177 optout=
 178 for set in ${options}; do
 179   for opt in `echo ${set} | sed -e 's|/| |'g`; do
 180     optout="${optout} !${opt}"
 181   done
 182 done
 183 optout=`echo ${optout} | sed -e 's/^ //'`
 184 if [ -n "${matchnegations}" ]; then
 185   optout=`echo ";${optout};" | sed -e 's/ /;/g' ${matchnegations} -e 's/^;//' -e 's/;$//' -e 's/;/ /g'`
 186 fi
 187 echo ". ${optout};\\"
 188
 189 # Work over the list of combinations.  We have to translate each one
 190 # to use the directory names rather than the option names, we have to
 191 # include the information in matches, and we have to generate the
 192 # correct list of options and negations.
 193 for combo in ${combinations}; do
 194   # Use the directory names rather than the option names.
 195   if [ -n "${todirnames}" ]; then
 196     dirout=`echo ${combo} | sed ${todirnames}`
 197   else
 198     dirout=${combo}
 199   fi
 200   # Remove the leading and trailing slashes.
 201   dirout=`echo ${dirout} | sed -e 's|^/||' -e 's|/$||g'`
 202
 203   # Look through the options.  We must output each option that is
 204   # present, and negate each option that is not present.  If an
 205   # element of a set is present, we need not negate the other elements
 206   # of the set.
 207   optout=
 208   for set in ${options}; do
 209     setopts=`echo ${set} | sed -e 's|/| |g'`
 210     found=
 211     for opt in ${setopts}; do
 212       case "${combo}" in
 213       *"/${opt}/"*)
 214         optout="${optout} ${opt}"
 215         found=yes
 216         ;;
 217       esac
 218     done
 219     if [ "${found}" = "" ]; then
 220       for opt in ${setopts}; do
 221         optout="${optout} !${opt}"
 222       done
 223     fi
 224   done
 225   optout=`echo ${optout} | sed -e 's/^ //'`
 226
 227   # Add any negations of matches.
 228   if [ -n "${matchnegations}" ]; then
 229     optout=`echo ";${optout};" | sed -e 's/ /;/g' ${matchnegations} -e 's/^;//' -e 's/;$//' -e 's/;/ /g'`
 230   fi
 231
 232   # Output the line with all appropriate matches.
 233   dirout="${dirout}" optout="${optout}" ./tmpmultilib2 ${matches}
 234 done
 235
 236 rm -f tmpmultilib2
 237
 238 # That's it.
 239 echo '"'
 240
 241 exit 0