.PHONY: build clean

include common.mk

CLIBPATH=./c

ifeq ($(LIB_SUFFIX),.so)
# Add SONAME as cgo does not currently do this. Mostly for Android, see https://stackoverflow.com/a/48291044
export override CGO_LDFLAGS += -Wl,-soname,$(LIB_FILE)
endif

# Creates targets like 'lib/linux/amd64/libeduvpn_common.so'
build: lib/$(GOOS)/$(GOARCH)/$(LIB_FILE)
ifdef COPY_LIB_TO
	install $< -Dt $(COPY_LIB_TO)
endif

${CLIBPATH}/libcommon$(LIB_SUFFIX): ${CLIBPATH}/common.c
	$(CC) -c -Wall -Werror -fpic -o ${CLIBPATH}/common.o ${CLIBPATH}/common.c
	$(CC) -shared -o $@ ${CLIBPATH}/common.o

# Build shared library and remove lib prefix (if any) from header name
# GOOS and GOARCH envvars are set by common.mk
# This extra target prevents unnecessary rebuild
lib/$(GOOS)/$(GOARCH)/$(LIB_FILE): ${CLIBPATH}/libcommon$(LIB_SUFFIX) exports.go servers.go ..
	CGO_ENABLED=1 go build -o $@ -buildmode=c-shared .
	mv lib/$(GOOS)/$(GOARCH)/$(LIB_PREFIX)$(LIB_NAME).h lib/$(GOOS)/$(GOARCH)/$(LIB_NAME).h || true	# Normalize header name

clean:
	rm -rf ../exports/lib/*
	rm -rf ${CLIBPATH}/common.o
	rm -rf ${CLIBPATH}/libcommon.so