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#!/bin/sh

# Copyright (C) 2007 Free Software Foundation, Inc.

# This file is part of GCC.

# GCC is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 3, or (at your option)

# any later version.

# GCC is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License

# along with GCC; see the file COPYING3.  If not see

# <http://www.gnu.org/licenses/>.

# This script takes the following arguments:

#

#    - the target sysroot

#    - the value of $(MULTILIB_MATCHES)

#    - the value of $(MULTILIB_OPTIONS)

#

# It uses these arguments to construct a definition of SYSROOT_SUFFIX_SPEC,

# which it prints to the standard output.  For each multilib directory FOO,

# the script checks whether $sysroot has a subdirectory FOO, and if so will

# use /FOO for all compatible command-line options.  It will not add a

# suffix for /FOO's options otherwise.  These suffixes are concatenated,

# with one subspec for each space-separated entry in $(MULTILIB_OPTIONS).

set -e

sysroot=$1

matches=$2

options=$3

# For each multilib option OPT, add to $substs a sed command of the

# form "-e 's/OPT/OPT/'".

substs=""

for option in `echo "$options" | tr '/' ' '`

do

  substs="$substs -e 's/$option/$option/g'"

done

# For each ALIAS=CANONICAL entry in $MULTILIB_MATCHES, look for sed

# arguments in $substs of the form "-e 's/CANONICAL/.../'".  Replace

# such entries with "-e 's/CANONICAL/ALIAS|.../'".  Both the ALIAS and

# CANONICAL parts of $MULTILIB_MATCHES use '?' to stand for '='.

#

# After this loop, a command of the form "echo FOO | eval sed $substs"

# will replace a canonical option FOO with a %{...}-style spec pattern.

for match in $matches

do

  canonical=`echo "$match" | sed -e 's/=.*//' -e 's/?/=/g'`

  alias=`echo "$match" | sed -e 's/.*=//' -e 's/?/=/g'`

  substs=`echo "$substs" | sed -e "s,s/$canonical/,&$alias|,"`

done

# Build up the final SYSROOT_SUFFIX_SPEC in $spec.

spec=

for combo in $options

do

  # See which option alternatives in $combo have their own sysroot

  # directory.  Create a subspec of the form "%{PAT1:/DIR1;...;PATn:DIRn}"

  # from each such option OPTi, where DIRi is the directory associated

  # with OPTi and PATi is the result of passing OPTi through $substs.

  subspec=

  for option in `echo "$combo" | tr '/' ' '`

  do

    dir=`echo "$option" | sed 's/mcpu=//'`

    if test -d "$sysroot/$dir"; then

      test -z "$subspec" || subspec="$subspec;"

      subspec="$subspec"`echo "$option" | eval sed $substs`":/$dir"

    fi

  done

  # Concatenate all the subspecs.

  test -z "$subspec" || spec="$spec%{$subspec}"

done

if test -n "$spec"; then

  echo "#undef SYSROOT_SUFFIX_SPEC"

  echo "#define SYSROOT_SUFFIX_SPEC \"$spec\""

fi