CC = gcc
CFLAGS = -Wall -Wextra -std=c11 -O2 -g
LDFLAGS =
LDFLAGS_LIB = $(LDFLAGS) -ldl
TARGET = exec-intercept

OBJDIR = obj
GENDIR = gen

SOURCES := $(sort $(wildcard *.c) $(GENDIR)/libintercept.so.c)
HEADERS_LIB := $(wildcard lib/*.h)
HEADERS := $(sort $(wildcard *.h) $(HEADERS_LIB) $(GENDIR)/libintercept.so.h)

.PHONY: all clean

all: $(TARGET)

clean:
	@echo "Cleaning"
	@rm -f $(TARGET)
	@rm -rf $(OBJDIR) $(GENDIR)


$(OBJDIR)/lib/libintercept.so: lib/libintercept.c $(HEADERS_LIB)
	@mkdir -p $(dir $@)
	@echo "CCLD -o $@"
	@$(CC) $(CFLAGS) -fPIC -shared -o $@ $< $(LDFLAGS_LIB)

$(GENDIR)/libintercept.so.c: $(OBJDIR)/lib/libintercept.so
	@mkdir -p $(dir $@)
	@echo "XXD -i $<"
	@cd $(dir $<) && xxd -i $(notdir $<) >$(abspath $@)

$(GENDIR)/libintercept.so.h: $(GENDIR)/libintercept.so.c
	@echo "SED -o $@"
	@sed -n 's/^\(.*\) =.*/extern \1;/p' $< >$@

$(OBJDIR)/%.o: %.c $(HEADERS) | $(OBJDIR)
	@mkdir -p $(dir $@)
	@echo "CC $<"
	@$(CC) $(CFLAGS) -c -o $@ $<

$(TARGET): $(patsubst %.c,$(OBJDIR)/%.o,$(SOURCES)) | $(OBJDIR)
	@echo "LD -o $@"
	@$(CC) -o $@ $^ $(LDFLAGS)

$(OBJDIR):
	@mkdir -p $(OBJDIR)