gcc-warnings

#!/bin/sh

# The olsr.org Optimized Link-State Routing daemon (olsrd)
#
# (c) by the OLSR project
#
# See our Git repository to find out who worked on this file
# and thus is a copyright holder on it.
#
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# * Redistributions of source code must retain the above copyright
#   notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
#   notice, this list of conditions and the following disclaimer in
#   the documentation and/or other materials provided with the
#   distribution.
# * Neither the name of olsr.org, olsrd nor the names of its
#   contributors may be used to endorse or promote products derived
#   from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
# Visit http://www.olsr.org for more information.
#
# If you find this software useful feel free to make a donation
# to the project. For more information see the website or contact
# the copyright holders.
#

#
# We expect warning options for gcc as arguments and return the ones which are
# accepted by the given gcc.
#

set -ue
#set -vx

# make sure we do not use some locale ....
export LANG=C LC_ALL=C LC_COLLATE=C LC_CTYPE=C LC_MESSAGES=C LC_NUMERIC=C

OPTS=""
for param; do
    case "$param" in
    -[fWm]?*) OPTS="$OPTS $param";;
    *)        echo "Ignoring $param" >&2
    esac
done

testcompile() {
    $CC $OPTS -x c -o /dev/null - 2>&1 <<- EOF
       int main(void) {
           return 0;
       }
EOF
}

parsetest() {
    while read error; do
        case "$error" in
        *:\ unrecognized\ *option\ \"*)
            opt="${error#*\"}"
            opt="${opt%\"*}"
            ;;
        *:\ unrecognized\ *option\ \‘*)
            opt="${error#*\‘}"
            opt="${opt%\‘*}"
            ;;
        *:\ unrecognized\ *option\ \'*)
            opt="${error#*\'}"
            opt="${opt%\'*}"
            ;;
        *:\ unrecognized\ *option\ \`*)
            opt="${error#*\`}"
            opt="${opt%\'*}"
            ;;

        # clang
        *:\ unknown\ argument:\ \'*)
            opt="${error#*\'}"
            opt="${opt%\'*}"
            ;;
        *:\ unknown\ warning\ option\ \'*)
            opt="${error#*\'}"
            opt="${opt%\'*}"
            ;;
        *:\ optimization\ flag\ *\ is\ not\ supported)
            opt="${error#*\'}"
            opt="${opt%\'*}"
            ;;

        *)
            continue
            ;;
       esac
       # if we come here, we have in $opt the option to remove. and
       # we remove all instances. And we save against leading "-"
       NEW_OPTS=""
       for o in $OPTS; do
           case "$o" in
               $opt) : echo "Removed $o" >&2;;
               *)    NEW_OPTS="$NEW_OPTS $o";;
           esac
       done
       OPTS="$NEW_OPTS"
    done
    echo $OPTS
}

testcompile | parsetest

exit 0