Add Makefile, deps and other misc

.gitignore

@@ -1,6 +1,8 @@
 # langserver
 .ccls-cache/
 
+build/
+
 # Prerequisites
 *.d
 

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "wavelib"]
+	path = wavelib
+	url = https://github.com/rafat/wavelib.git

Makefile

@@ -0,0 +1,30 @@
+# adapted from https://spin.atomicobject.com/2016/08/26/makefile-c-projects/
+TARGET_EXEC ?= main
+
+BUILD_DIR ?= ./build
+SRC_DIR ?= ./src
+INC_DIR ?= ./include
+
+SRCS := $(shell find $(SRC_DIR) -name *.c)
+OBJS := $(SRCS:%=$(BUILD_DIR)/%.o)
+DEPS := $(OBJS:.o=.d)
+
+INC_FLAGS := $(addprefix -I,$(INC_DIR))
+
+CFLAGS ?= $(INC_FLAGS) -Wall -MMD -MP
+
+$(BUILD_DIR)/$(TARGET_EXEC): $(OBJS)
+	$(CC) $(OBJS) -o $@ $(LDFLAGS)
+
+$(BUILD_DIR)/%.c.o: %.c
+	$(MKDIR_P) $(dir $@)
+	$(CC) $(CFLAGS) -c $< -o $@
+
+.PHONY: clean
+
+clean:
+	$(RM) -r $(BUILD_DIR)/*
+
+-include $(DEPS)
+
+MKDIR_P ?= mkdir -p