mg++

#!/bin/sh
#
# mg++ - testing whether g++ accepts an input with multiple C++ standards
#
# Copyright (C) 2014 Masatake YAMATO
#
# This program 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 2 of the License, or
# (at your option) any later version.
#
# This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
#

help()
{
    echo Usage: "$0" "input.cpp" 1>&2
    exit $1
}

if [ $# = 0 ]; then
    help 1 1>&2
elif [ $1 = "-h" ] || [ $1 = "--help" ]; then
    help 0
fi

if ! type g++ > /dev/null; then
    echo "No g++ found" 1>&2
    exit 1
fi

if ! [ -f $1 ]; then
    echo "No such file: $1" 1>&2
    exit 1
fi

STDS="
c++03
gnu++03
c++11
gnu++11
c++14
gnu++14
c++17
gnu++17
c++20
gnu++20
c++23
gnu++23
"

dummy=/tmp/input-$$.cpp
cat > $dummy <<EOF
// dummy input for mg++
int main (void)
{
  return 0;
}
EOF

for s in $STDS; do
    if ! g++ -fsyntax-only -c --std=$s -c $dummy; then
	echo "*** this g++ doesn't support --std=$s option"
	continue
    fi

    printf "%s..." "*** compile with --std=$s"
    LOG=$(g++ -fsyntax-only -c --std=$s $1 2>&1)
    if [ $? = 0 ]; then
	echo ok
    else
	echo error
	echo "$LOG"
	echo -----------------------------------
    fi
done

rm -f $dummy