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gcc/genmultilib
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241
gcc/genmultilib
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#!/bin/sh
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# Generates multilib.h.
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# Copyright (C) 1994 Free Software Foundation, Inc.
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#This file is part of GNU CC.
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#GNU CC is free software; you can redistribute it and/or modify
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#it under the terms of the GNU General Public License as published by
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#the Free Software Foundation; either version 2, or (at your option)
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#any later version.
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#GNU CC is distributed in the hope that it will be useful,
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#but WITHOUT ANY WARRANTY; without even the implied warranty of
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#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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#GNU General Public License for more details.
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#You should have received a copy of the GNU General Public License
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#along with GNU CC; see the file COPYING. If not, write to
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#the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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# This shell script produces a header file which the gcc driver
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# program uses to pick which library to use based on the machine
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# specific options that it is given.
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# The first argument is a list of sets of options. The elements in
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# the list are separated by spaces. Within an element, the options
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# are separated by slashes. No leading dash is used on the options.
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# Each option in a set is mutually incompatible with all other options
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# in the set.
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# The optional second argument is a list of subdirectory names. If
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# the second argument is non-empty, there must be as many elements in
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# the second argument as there are options in the first argument. The
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# elements in the second list are separated by spaces. If the second
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# argument is empty, the option names will be used as the directory
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# names.
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# The optional third argument is a list of options which are
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# identical. The elements in the list are separated by spaces. Each
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# element must be of the form OPTION=OPTION. The first OPTION should
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# appear in the first argument, and the second should be a synonym for
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# it.
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# The output looks like
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# #define MULTILIB_MATCHES "\
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# SUBDIRECTORY OPTIONS;\
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# ...
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# "
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# The SUBDIRECTORY is the subdirectory to use. The OPTIONS are
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# multiple options separated by spaces. Each option may start with an
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# exclamation point. gcc will consider each line in turn. If none of
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# the options beginning with an exclamation point are present, and all
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# of the other options are present, that subdirectory will be used.
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# The order of the subdirectories is such that they can be created in
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# order; that is, a subdirectory is preceded by all its parents.
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# Here is a example (this is simplified from the actual 680x0 case):
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# genmultilib "m68000/m68020 msoft-float" "m68000 m68020 msoft-float"
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# "m68000=mc68000"
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# This produces:
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# #define MULTILIB_MATCHES "\
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# m68000/msoft-float m68000 msoft-float;\
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# m68000/msoft-float mc68000 msoft-float;\
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# m68020/msoft-float m68020 msoft-float;\
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# msoft-float !m68000 !mc68000 !m68020 msoft-float;\
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# m68000 m68000 !msoft-float;\
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# m68000 mc60000 !msoft-float;\
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# m68020 m68020 !msoft-float;\
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# . !m68000 !mc68000 !m68020 !msoft-float;\
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# "
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# The effect is that `gcc -msoft-float' (for example) will append
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# msoft-float to the directory name when searching for libraries or
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# startup files, and `gcc -m68000 -msoft-float' (for example) will
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# append m68000/msoft-float.
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# Copy the positional parameters into variables.
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options=$1
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dirnames=$2
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matches=$3
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# What we want to do is select all combinations of the sets in
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# options. Each combination which includes a set of mutually
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# exclusive options must then be output multiple times, once for each
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# item in the set. Selecting combinations is a recursive process.
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# Since not all versions of sh support functions, we achieve recursion
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# by creating a temporary shell script which invokes itself.
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rm -f tmpmultilib
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cat >tmpmultilib <<\EOF
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#!/bin/sh
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# This recursive script basically outputs all combinations of its
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# input arguments, handling mutually exclusive sets of options by
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# repetition. When the script is called, ${initial} is the list of
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# options which should appear before all combinations this will
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# output. The output looks like a list of subdirectory names with
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# leading and trailing slashes.
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if [ "$#" != "0" ]; then
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first=$1
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shift
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for opt in `echo $first | sed -e 's|/| |'g`; do
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echo ${initial}${opt}/
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done
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./tmpmultilib $@
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for opt in `echo $first | sed -e 's|/| |'g`; do
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initial="${initial}${opt}/" ./tmpmultilib $@
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done
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fi
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EOF
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chmod +x tmpmultilib
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combinations=`initial=/ ./tmpmultilib ${options}`
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rm -f tmpmultilib
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# Construct a sed pattern which will convert option names to directory
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# names.
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todirnames=
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if [ -n "${dirnames}" ]; then
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set x ${dirnames}
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shift
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for set in ${options}; do
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for opt in `echo ${set} | sed -e 's|/| |'g`; do
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if [ "$1" != "${opt}" ]; then
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todirnames="${todirnames} -e s|/${opt}/|/${1}/|g"
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fi
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shift
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done
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done
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fi
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# Construct a sed pattern which will add negations based on the
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# matches. The semicolons are easier than getting the shell to accept
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# quoted spaces when expanding a variable.
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matchnegations=
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for i in ${matches}; do
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l=`echo $i | sed -e 's/=.*$//'`
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r=`echo $i | sed -e 's/^.*=//'`
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matchnegations="${matchnegations} -e s/;!${l};/;!${l};!${r};/"
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done
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# We need another recursive shell script to correctly handle positive
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# matches. If we are invoked as
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# genmultilib "opt1 opt2" "" "opt1=nopt1 opt2=nopt2"
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# we must output
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# opt1/opt2 opt1 opt2
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# opt1/opt2 nopt1 opt2
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# opt1/opt2 opt1 nopt2
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# opt1/opt2 nopt1 nopt2
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# In other words, we must output all combinations of matches.
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rm -f tmpmultilib2
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cat >tmpmultilib2 <<\EOF
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#!/bin/sh
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# The positional parameters are a list of matches to consider.
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# ${dirout} is the directory name and ${optout} is the current list of
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# options.
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if [ "$#" = "0" ]; then
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echo "${dirout} ${optout};\\"
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else
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first=$1
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shift
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dirout="${dirout}" optout="${optout}" ./tmpmultilib2 $@
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l=`echo ${first} | sed -e 's/=.*$//'`
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r=`echo ${first} | sed -e 's/^.*=//'`
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case " ${optout} " in
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*" ${l} "*)
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newopt=`echo " ${optout} " | sed -e "s/ ${l} / ${r} /" -e 's/^ //' -e 's/ $//'`
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dirout="${dirout}" optout="${newopt}" ./tmpmultilib2 $@
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;;
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esac
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fi
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EOF
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chmod +x tmpmultilib2
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# We are ready to start output.
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echo '#define MULTILIB_SELECT "\'
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# Start with the current directory, which includes only negations.
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optout=
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for set in ${options}; do
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for opt in `echo ${set} | sed -e 's|/| |'g`; do
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optout="${optout} !${opt}"
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done
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done
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optout=`echo ${optout} | sed -e 's/^ //'`
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if [ -n "${matchnegations}" ]; then
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optout=`echo ";${optout};" | sed -e 's/ /;/g' ${matchnegations} -e 's/^;//' -e 's/;$//' -e 's/;/ /g'`
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fi
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echo ". ${optout};\\"
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# Work over the list of combinations. We have to translate each one
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# to use the directory names rather than the option names, we have to
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# include the information in matches, and we have to generate the
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# correct list of options and negations.
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for combo in ${combinations}; do
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# Use the directory names rather than the option names.
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if [ -n "${todirnames}" ]; then
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dirout=`echo ${combo} | sed ${todirnames}`
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else
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dirout=${combo}
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fi
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# Remove the leading and trailing slashes.
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dirout=`echo ${dirout} | sed -e 's|^/||' -e 's|/$||g'`
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# Look through the options. We must output each option that is
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# present, and negate each option that is not present. If an
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# element of a set is present, we need not negate the other elements
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# of the set.
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optout=
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for set in ${options}; do
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setopts=`echo ${set} | sed -e 's|/| |g'`
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found=
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for opt in ${setopts}; do
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case "${combo}" in
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*"/${opt}/"*)
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optout="${optout} ${opt}"
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found=yes
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;;
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esac
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done
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if [ "${found}" = "" ]; then
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for opt in ${setopts}; do
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optout="${optout} !${opt}"
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done
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fi
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done
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optout=`echo ${optout} | sed -e 's/^ //'`
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# Add any negations of matches.
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if [ -n "${matchnegations}" ]; then
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optout=`echo ";${optout};" | sed -e 's/ /;/g' ${matchnegations} -e 's/^;//' -e 's/;$//' -e 's/;/ /g'`
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fi
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# Output the line with all appropriate matches.
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dirout="${dirout}" optout="${optout}" ./tmpmultilib2 ${matches}
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done
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rm -f tmpmultilib2
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# That's it.
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echo '"'
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exit 0
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