seperate out library compilation from general compilation

This can help with a more nuanced compilation. (eg. use system libraries
rather than compile our own)
Furthermore, it decreases the needed compilation time, since we needn't
recompile the whole thing when having cleaned out our local sources.

.gitignore

@@ -18,5 +18,6 @@
 *.lock
 /bin/
 /obj/
+/lib/obj/
 compile_commands.json
 compile_commands.events.json

Makefile

@@ -23,7 +23,7 @@ CFLAGS   += -fsanitize=address -ftrapv -g
 LDFLAGS  += -fsanitize=address -ftrapv
 endif
 CPPFLAGS += -Iinclude -Ilib/glad/include -Ilib/glfw/include -Ilib/libarchive/libarchive
-LDFLAGS  += -Lobj/lib/glfw/src -Lobj/lib/libarchive/libarchive
+LDFLAGS  += -Llib/obj/glfw/src -Llib/obj/libarchive/libarchive
 LDLIBS   += -lm -lglfw -larchive
 
 # detect if we're compiling on Windows, meaning
@@ -43,21 +43,25 @@ SRC  := $(wildcard src/*.c  src/*/*.c  src/*/*/*.c  src/*/*/*/*.c  src/*/*/*/*/*
 OBJ  := $(SRC:%.c=obj/%.o)
 TEST := $(wildcard test/*.c test/*/*.c test/*/*/*.c test/*/*/*/*.c test/*/*/*/*/*.c test/*/*/*/*/*/*.c test/*/*/*/*/*/*/*.c test/*/*/*/*/*/*/*/*.c)
 
-.PHONY: all test clean libs
+# TODO: potentially automatically detect whether we should compile libs, or if we can just go ahead.
+.PHONY: all libs test clean clean-libs
 all: bin/$(NAME)
-libs: obj/lib/glfw/ obj/lib/libarchive/
+libs: lib/obj/glfw/ lib/obj/libarchive/
 test: bin/TEST_$(NAME); bin/TEST_$(NAME)
 clean:
 	@[ -d bin/ ] && rm -vr bin/ || true
 	@[ -d obj/ ] && rm -vr obj/ || true
+clean-libs:
+	@[ -d lib/obj/ ] && rm -vr lib/obj/
+
 
 # compiles the libraries using cmake
-obj/lib/%/: lib/%/
+lib/obj/%/: lib/%/
 	cmake -S $< -B $@
 	$(MAKE) -C $@
 
 # link together a runtime binary
-bin/$(NAME): libs $(OBJ)
+bin/$(NAME): $(OBJ)
 	$(info [CC/LD]	$@)
 	@mkdir -p $(@D)
 	@$(CC) -o $@ $^ $(LDFLAGS) $(LDLIBS)