refactor: decouple trie into static library

Makefile

@@ -9,7 +9,10 @@ BUILD_DIR ?= build
 SRC_DIR ?= src
 TEST_DIR ?= test
 THIRDPARTY_DIR ?= thirdparty
-INC_DIRS ?= include $(THIRDPARTY_DIR)/include
+
+INC_DIRS ?= include $(THIRDPARTY_DIR)/include trie/include
+LIBS ?= trie m
+LIB_DIRS ?= ./trie/build
 
 BIN := $(BUILD_DIR)/$(BIN_FILENAME)
 
@@ -36,7 +39,12 @@ INC_FLAGS := $(addprefix -I,$(INC_DIRS))
 # -MP: generate a dummy target for every header file (according to the  docs it
 #  prevents some errors when removing header files)
 CFLAGS ?= -MMD -MP -g
-INTERNALCFLAGS := $(INC_FLAGS) $(CFLAGS) -Wall -Wextra -DLANDER_VERSION=\"$(VERSION)\"
+_CFLAGS := $(INC_FLAGS) $(CFLAGS) -Wall -Wextra -DLANDER_VERSION=\"$(VERSION)\"
+
+_LDFLAGS := $(addprefix -L,$(LIB_DIRS)) $(addprefix -l,$(LIBS)) $(LDFLAGS)
+
+export CFLAGS
+export LDFLAGS
 
 .PHONY: all
 all: bin
@@ -47,18 +55,22 @@ all: bin
 .PHONY: objs
 objs: $(OBJS)
 
+.PHONY: libtrie
+libtrie:
+	$(MAKE) -C trie
+
 .PHONY: bin
 bin: $(BIN)
-$(BIN): $(OBJS)
-	$(CC) $(INTERNALCFLAGS) $(LDFLAGS) -lm -o $@ $^
+$(BIN): $(OBJS) libtrie
+	$(CC) -o $@ $(OBJS) $(_LDFLAGS)
 
 $(BUILD_DIR)/$(SRC_DIR)/%.c.o: $(SRC_DIR)/%.c
 	mkdir -p $(dir $@)
-	$(CC) $(INTERNALCFLAGS) -c $< -o $@
+	$(CC) $(_CFLAGS) -c $< -o $@
 
 $(BUILD_DIR)/$(THIRDPARTY_DIR)/%.c.o: $(THIRDPARTY_DIR)/%.c
 	mkdir -p $(dir $@)
-	$(CC) $(INTERNALCFLAGS) -c $< -o $@
+	$(CC) $(_CFLAGS) -c $< -o $@
 
 
 # =====TESTING=====
@@ -95,7 +107,7 @@ $(BINS_TEST): %: %.c.o
 # exposed.
 $(BUILD_DIR)/$(TEST_DIR)/%.c.o: $(TEST_DIR)/%.c
 	mkdir -p $(dir $@)
-	$(CC) $(INTERNALCFLAGS) -I$(TEST_DIR) \
+	$(CC) $(_CFLAGS) -I$(TEST_DIR) \
 		-I$(dir $(@:$(BUILD_DIR)/$(TEST_DIR)/%=$(SRC_DIR)/%)) \
 		-c $< -o $@
 
@@ -111,6 +123,7 @@ fmt:
 .PHONY: clean
 clean:
 	rm -rf $(BUILD_DIR)
+	$(MAKE) -C trie clean
 
 
 .PHONY: bear