use makefile build system

.gitignore

@@ -1,3 +1,8 @@
-.vscode
+.*
-build
+
-package/usr
+!.github/
+!.gitignore
+
+/bin/
+/obj/
+/compile_commands.json

makefile

@@ -0,0 +1,28 @@
+CC      := x86_64-pc-linux-gnu-gcc
+CFLAGS  := -Wall -Wextra -Wpedantic -O2 -std=gnu17
+LDFLAGS :=
+
+SRC = $(shell find src/ -name '*.c')
+OBJ := $(patsubst src/%,obj/%,$(SRC:.c=.o))
+BIN := bin/coinflip
+
+compile: compile_commands.json $(BIN)
+clean:
+	rm -rf obj/ bin/ compile_commands.json
+
+# link the .o files
+$(BIN): $(OBJ)
+	@mkdir -p $(@D)
+	$(CC) $(LDFLAGS) $(OBJ) -o $(BIN)
+
+# compile .o files (w/ .d files)
+obj/%.o: src/%.c
+	@mkdir -p $(@D)
+	$(CC) -c -MD -MP $(CFLAGS) -o $@ $<
+
+compile_commands.json: makefile
+	$(MAKE) clean
+	@touch compile_commands.json
+	bear -- make compile
+
+-include $(OBJ:.o=.d)