#!/bin/sh
set -eu
 
CONFIG=$1
TARGET=$2
 
if [ $# -ne 2 ]; then
        echo 'Invalid number of arguments.'
        exit 1
fi
 
if [ ! -f $CONFIG ]; then
        echo "$CONFIG not found."
        exit 2
fi
 
if [ ! -f $TARGET ]; then
        echo "$TARGET not found."
        exit 3
fi
 
DEFINES=$(awk '$1 == "#define" && $3 == "1" { printf "-D%s ", $2 }' $CONFIG)
 
m4 -P $DEFINES $TARGET