#!/bin/sh

usage() {
	prog=$1
	cat << _EOF
${prog} [<options>]

<options> can be one of the following:

--prefix=<val>		The installation prefix (default: /usr).
--enable-debug		Enable debug mode compilation (default: disabled).
--disable-allocator	Disable use of internal memory allocator mechanism (default: enabled).
--enable-debug-stats	Enable printing of some verbose debug info (default: disabled).
--help			Display this help message.

_EOF
}

arg1=$1
debug=0
allocator=1
debug_stats=0
prefix=/usr
while [ "${arg1}" != "" ]
do
	case "$arg1" in
	--enable-debug) debug=1;;
	--disable-allocator) allocator=0;;
	--enable-debug-stats) debug_stats=1;;
	--prefix=*)
		pval=`echo ${arg1} | cut -f2 -d"="`
		prefix=$pval
	;;
	--help) usage $0;;
	*)
		echo "Unrecognized option: ${arg1}"
		exit 1
	;;
	esac
	shift
	arg1=$1
done

if [ $debug -eq 1 ]
then
	typ="DEBUG"
else
	typ="RELEASE"
fi

linkvar="LINK"
compilevar="COMPILE"
compilecppvar="COMPILE_cpp"
vecflagsvar="VEC_FLAGS"
loopoptflagsvar="LOOP_OPTFLAGS"
cppflagsvar="CPPFLAGS"
genoptvar="GEN_OPT"
rabinoptvar="RABIN_OPT"
noslabcppflagsvar="NO_SLAB_CPPFLAGS"
debugstatscppflagsvar="DEBUG_STATS_CPPFLAGS"
prefixvar="PREFIX"

noslabcppflagsval=
debugstatscppflagsval=

[ $allocator -eq 0 ] && noslabcppflagsval='\$\(NO_SLAB_CPPFLAGS\)'
[ $debug_stats -eq 1 ] && debugstatscppflagsval='\$\(DEBUG_STATS_CPPFLAGS\)'

cat Makefile.in | sed "
s#@${linkvar}@#\\\$\\(${typ}_${linkvar}\\)#g
s#@${compilevar}@#\\\$\\(${typ}_${compilevar}\\)#g
s#@${compilecppvar}@#\\\$\\(${typ}_${compilecppvar}\\)#g
s#@${vecflagsvar}@#\\\$\\(${typ}_${vecflagsvar}\\)#g
s#@${loopoptflagsvar}@#\\\$\\(${typ}_${loopoptflagsvar}\\)#g
s#@${cppflagsvar}@#\\\$\\(${typ}_${cppflagsvar}\\)#g
s#@${genoptvar}@#\\\$\\(${typ}_${genoptvar}\\)#g
s#@${rabinoptvar}@#\\\$\\(${typ}_${rabinoptvar}\\)#g
s#@${noslabcppflagsvar}@#${noslabcppflagsval}#g
s#@${debugstatscppflagsvar}@#${debugstatscppflagsval}#g
s#@${prefixvar}@#${prefix}#g
" > Makefile