BD ?= build
SD ?= src
LIBS_DIR ?= libs
LIBS ?= $(wildcard $(LIBS_DIR)/*)

CGI_EXECS ?= view_comments.cgi new_client.cgi
EXEC_TARGETS := $(patsubst %.cgi,$(BD)/%.cgi,$(CGI_EXECS))

LDFLAGS ?= -L$(BD)/ -lcgic -lqments -lhiredis -ltomcrypt -luuid

SRC_FILES := $(shell find $(SD) -name *.c)
EXEC_OBJS := $(patsubst %.cgi,$(BD)/%.o,$(CGI_EXECS))
OBJ_FILES := $(filter-out $(EXEC_OBJS),$(patsubst $(SD)/%.c,$(BD)/%.o,$(SRC_FILES)))

INCLUDE_DIRS = -Ilibs/qments/include -Ilibs/cgic
LIB_TARGETS = $(patsubst $(LIBS_DIR)/%,$(BD)/lib%.a,$(LIBS))

CFLAGS ?= -O2 -std=c99 -pedantic

$(BD)/libcgic.a:
	$(MAKE) -C $(LIBS_DIR)/cgic
	mkdir -p $(@D)
	cp $(LIBS_DIR)/cgic/libcgic.a $(BD)

$(BD)/libqments.a:
	$(MAKE) -C $(LIBS_DIR)/qments static
	cp $(LIBS_DIR)/qments/$(BD)/libqments.a $(BD)

$(BD)/%.cgi: $(BD)/%.o $(OBJ_FILES)
	mkdir -p $(@D)
	$(CC) $(INCLUDE_DIRS) $(CFLAGS) $^ -o $@ $(LDFLAGS)

$(BD)/%.o: $(SD)/%.c $(LIB_TARGETS)
	mkdir -p $(@D)
	$(CC) $(INCLUDE_DIRS) $(CFLAGS) -c $< -o $@ $(LDFLAGS)

all: $(EXEC_TARGETS)

clean:
	rm -rfI $(BD)/

.PHONY: all clean