# PKGC ?= pkg-config

# LUAPKG ?= lua lua5.1 lua5.2 lua5.3
# lua's package config can be under various names
# LUAPKGC := $(shell for pc in $(LUAPKG); do \
# 		$(PKGC) --exists $$pc && echo $$pc && break; \
# 	done)

LUA_LIBDIR ?= $(shell $(PKGC) --variable=libdir $(LUAPKGC))
LUA_CFLAGS ?= $(shell $(PKGC) --cflags $(LUAPKGC))
LUA_LDFLAGS ?= $(shell $(PKGC) --libs-only-L $(LUAPKGC))

CMOD = libmodbus.so
OBJS = lua-libmodbus.o
LIBS = -lmodbus
CSTD = -std=c11

OPT ?= -Os
WARN = -Wall -pedantic
CFLAGS += -g -fPIC $(CSTD) $(WARN) $(OPT) $(LUA_CFLAGS) $(EXTRA_CFLAGS)
LDFLAGS += -shared $(CSTD) $(LIBS) $(LUA_LDFLAGS) $(EXTRA_LDFLAGS)

all: $(CMOD)

$(CMOD): $(OBJS)
	$(CC) $(LDFLAGS) $(OBJS) $(LIBS) -o $@

.c.o:
	$(CC) -c $(CFLAGS) -o $@ $<

install:
	mkdir -p $(DESTDIR)$(LUA_LIBDIR)/lua
	cp $(CMOD) $(DESTDIR)$(LUA_LIBDIR)/lua/

clean:
	$(RM) $(CMOD) $(OBJS)

test:
	busted --exclude-tags real