configure

#!/bin/sh
#set -x
prefix=/usr/local

libs=`cat << EOF
EOF
`
clear_config() {
	rm -f config.mak 2>/dev/null
}

add_config() {
	printf "%s\n" "$1" >> config.mak
}

add_cflags() {
	add_config "CFLAGS += $1"
}

add_ldflags() {
	add_config "LDFLAGS += $1"
}

get_pkgconf_cflags() {
	pkg-config --cflags "$1" 2>/dev/null
}

get_pkgconf_ldflags() {
	pkg-config --libs "$1" 2>/dev/null
}

add_pkgconf_cflags() {
	fallback="$2"
	flags=$(get_pkgconf_cflags "$1")
	[ -z "$flags" ] && flags="$fallback"
	add_cflags "$flags"
}

add_pkgconf_ldflags() {
	fallback="$2"
	flags=$(get_pkgconf_ldflags "$1")
	[ -z "$flags" ] && flags="$fallback"
	add_ldflags "$flags"
}

add_lib() {
	add_pkgconf_cflags "$1" "$2"
	add_pkgconf_ldflags "$1" "$3"
	return 0
}

usage() {
	echo "supported arguments"
	echo "--prefix=/path 		            default: $prefix"
	echo "--exec_prefix=/path	            default: $prefix/bin"
	echo "--bindir=/path		            default: $prefix/bin"
	echo "--libdir=/path		            default: $prefix/lib"
	echo "--includedir=/path	            default: $prefix/include"
	echo "--sysconfdir=/path	            default: $prefix/etc"
	echo "--with-ssl=[auto,wolfssl,openssl,no]  default: auto"
	echo "--disable-static                      default: no"
	echo "--enable-shared                       default: no"
	echo "--help : show this text"
	exit 1
}

spliteq() {
	arg=$1
	echo "${arg#*=}"
	#alternatives echo "$arg" | cut -d= -f2-
	# or echo "$arg" | sed 's/[^=]*=//'
}

trylink () {
printf "checking whether linking against %s works... " "$2"
echo "int main(){};" > "$tmpc"
if $CC "$2" -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
printf "yes\n"
eval "$1=\"\${$1} \$2\""
eval "$1=\${$1# }"
return 0
else
printf "no\n"
return 1
fi
}

ssl_lib=auto
parsearg() {
	case "$1" in
	--prefix=*) prefix=`spliteq $1`;;
	--exec_prefix=*) exec_prefix=`spliteq $1`;;
	--bindir=*) bindir=`spliteq $1`;;
	--libdir=*) libdir=`spliteq $1`;;
	--includedir=*) includedir=`spliteq $1`;;
	--sysconfdir=*) sysconfdir=`spliteq $1`;;
	--help) usage;;
	--disable-static) disable_static=1 ;;
	--disable-static=yes) disable_static=1 ;;
	--enable-shared) enable_shared=1 ;;
	--enable-shared=yes) enable_shared=1 ;;
	--with-ssl=*) ssl_lib=`spliteq $1`;;
	esac
}

while true ; do
	case $1 in
	-*) parsearg "$1"; shift;;
	*) break ;;
	esac
done

[ -z "$exec_prefix" ] && exec_prefix=$prefix
[ -z "$libdir" ] && libdir=$prefix/lib
[ -z "$includedir" ] && includedir=$prefix/include
[ -z "$sysconfdir" ] && sysconfdir=$prefix/etc
[ -z "$bindir" ] && bindir=$exec_prefix/bin
[ -z "$CC" ] && CC=cc

clear_config

add_config "prefix = $prefix"
add_config "exec_prefix = $exec_prefix"
add_config "bindir = $bindir"
add_config "libdir = $libdir"
add_config "includedir = $includedir"
add_config "sysconfdir = $sysconfdir"

add_config "CC ?= $CC"
[ -z "$CPPFLAGS" ] || add_config "CPPFLAGS += $CPPFLAGS"
[ -z "$CFLAGS" ] ||   add_cflags "$CFLAGS"

for lib in $libs ; do add_lib "$lib" ; done

#
# Get a temp filename we can use
#
i=0
set -C
while : ; do i=$(($i+1))
tmpc="./conf$$-$PPID-$i.c"
2>|/dev/null > "$tmpc" && break
test "$i" -gt 50 && fail "$0: cannot create temporary file $tmpc"
done
set +C
trap 'rm "$tmpc"' EXIT INT QUIT TERM HUP


if [ "$ssl_lib" = auto ] ; then
	foo=
	if trylink foo "-lwolfssl" ; then ssl_lib=cyassl
	elif trylink foo "-lssl" && trylink foo "-lcrypto" ; then ssl_lib=openssl
	else ssl_lib=no
	fi
fi
if [ ! "$ssl_lib" = no ] ; then
	add_config "CFLAGS += -DUSE_SSL"
	case "$ssl_lib" in
		openssl) add_lib openssl "" "-lssl -lcrypto" && add_cflags "-DUSE_OPENSSL" ;;
		cyassl|wolfssl) add_lib wolfssl "" "-lwolfssl" && add_cflags "-DUSE_CYASSL" ;;
		*) echo "error: unsupported --with-ssl option $ssl_lib" ; exit 1 ;;
	esac
fi
[ "$disable_static" = 1 ] && add_config "ALL_LIBS =" && enable_shared=1
[ "$enable_shared" = 1 ] && add_config "ALL_LIBS += librocksock.so"


echo "hint: if you intend to build a static binary with minimal size, try NO_DNS_SUPPORT in CFLAGS"
echo "config.mak successfully created. now run make && make install"