#!/bin/sh
set -eu

rm -f config.mk

cat > config.mk <<-EOF
	VER=\`(cat VERSION)\`
	MAJOR=\`(cut -d . -f 1 VERSION)\`
	MINOR=\`(cut -d . -f 2 VERSION)\`
EOF

printf "Detecting shared object style: "
if [ "$(uname -s)" = Darwin ]
then
	echo ".dylib"
	cat >> config.mk <<-EOF
		SO = dylib
		SOFLAGS = -dynamiclib -install_name "libderp.\${MAJOR}.dylib" -current_version \${VER} -compatibility_version \${MAJOR}.\${MINOR}.0
	EOF
else
	echo ".so"
	cat >> config.mk <<-EOF
		SO = so
		SOFLAGS = -shared -Wl,-soname,libderp.so.\${MAJOR}.\${MINOR}
	EOF
fi

printf "Detecting Boehm GC for dev variant... "
GCLIB=`find /usr/local /opt -name 'libgc.*' -exec dirname {} \; 2>/dev/null | head -n 1`
GCINC=`find /usr/local /opt -name 'gc.h' -exec dirname {} \; 2>/dev/null | head -n 1`

if [ -z "$GCLIB" -o -z "$GCINC" ]; then
	echo "not found\n"
	echo "OK to compile release variant, but not dev variant"
else
	echo "$GCLIB"
	cat >> config.mk <<-EOF
	CFLAGS  += -I$GCINC/..
	LDFLAGS += -L$GCLIB
	EOF
fi