gmake supports restructed directories

Makefile

@@ -1,10 +1,11 @@
 .POSIX:
 .SUFFIXES:
+.DEFAULT_GOAL := all
 
 include config.mk
 
 # flags for compiling
-DWLCPPFLAGS = -I. -DWLR_USE_UNSTABLE -D_POSIX_C_SOURCE=200809L \
+DWLCPPFLAGS = -Ibuild -DWLR_USE_UNSTABLE -D_POSIX_C_SOURCE=200809L \
 	-DVERSION=\"$(VERSION)\" $(XWAYLAND)
 DWLDEVCFLAGS = -g -Wpedantic -Wall -Wextra -Wdeclaration-after-statement \
 	-Wno-unused-parameter -Wshadow -Wunused-macros -Werror=strict-prototypes \
@@ -16,13 +17,28 @@ PKGS      = wayland-server xkbcommon libinput $(XLIBS)
 DWLCFLAGS = `$(PKG_CONFIG) --cflags $(PKGS)` $(WLR_INCS) $(DWLCPPFLAGS) $(DWLDEVCFLAGS) $(CFLAGS)
 LDLIBS    = `$(PKG_CONFIG) --libs $(PKGS)` $(WLR_LIBS) -lm $(LIBS)
 
-all: dwl
-dwl: dwl.o util.o
-	$(CC) dwl.o util.o $(DWLCFLAGS) $(LDFLAGS) $(LDLIBS) -o $@
-dwl.o: dwl.c client.h config.h config.mk cursor-shape-v1-protocol.h \
+# macros to relevant path definitions
+define mkbin
+$(addprefix $(BIN)/,$1)
+endef
+define mkbuild
+$(addprefix $(BUILD)/,$1)
+endef
+define mksrc
+$(addprefix $(SRC)/,$1)
+endef
+
+.PHONY: setup
+setup:
+	mkdir -p $(BIN) $(BUILD)
+
+all: setup $(call mkbin,dwl)
+$(BIN)/dwl: $(call mkbuild,dwl.o util.o)
+	$(CC) $^ $(DWLCFLAGS) $(LDFLAGS) $(LDLIBS) -o $@
+$(BUILD)/dwl.o: $(call mksrc,dwl.c client.h) config.mk $(call mkbuild,config.h cursor-shape-v1-protocol.h \
 	pointer-constraints-unstable-v1-protocol.h wlr-layer-shell-unstable-v1-protocol.h \
-	wlr-output-power-management-unstable-v1-protocol.h xdg-shell-protocol.h
-util.o: util.c util.h
+	wlr-output-power-management-unstable-v1-protocol.h xdg-shell-protocol.h)
+$(BUILD)/util.o: $(call mksrc,util.c util.h)
 
 # wayland-scanner is a tool which generates C headers and rigging for Wayland
 # protocols, which are specified in XML. wlroots requires you to rig these up
@@ -30,39 +46,39 @@ util.o: util.c util.h
 WAYLAND_SCANNER   = `$(PKG_CONFIG) --variable=wayland_scanner wayland-scanner`
 WAYLAND_PROTOCOLS = `$(PKG_CONFIG) --variable=pkgdatadir wayland-protocols`
 
-cursor-shape-v1-protocol.h:
+$(BUILD)/cursor-shape-v1-protocol.h:
 	$(WAYLAND_SCANNER) enum-header \
 		$(WAYLAND_PROTOCOLS)/staging/cursor-shape/cursor-shape-v1.xml $@
-pointer-constraints-unstable-v1-protocol.h:
+$(BUILD)/pointer-constraints-unstable-v1-protocol.h:
 	$(WAYLAND_SCANNER) enum-header \
 		$(WAYLAND_PROTOCOLS)/unstable/pointer-constraints/pointer-constraints-unstable-v1.xml $@
-wlr-layer-shell-unstable-v1-protocol.h:
+$(BUILD)/wlr-layer-shell-unstable-v1-protocol.h:
 	$(WAYLAND_SCANNER) enum-header \
 		protocols/wlr-layer-shell-unstable-v1.xml $@
-wlr-output-power-management-unstable-v1-protocol.h:
+$(BUILD)/wlr-output-power-management-unstable-v1-protocol.h:
 	$(WAYLAND_SCANNER) server-header \
 		protocols/wlr-output-power-management-unstable-v1.xml $@
-xdg-shell-protocol.h:
+$(BUILD)/xdg-shell-protocol.h:
 	$(WAYLAND_SCANNER) server-header \
 		$(WAYLAND_PROTOCOLS)/stable/xdg-shell/xdg-shell.xml $@
 
-config.h:
-	cp config.def.h $@
+$(BUILD)/config.h:
+	cp $(SRC)/config.def.h $@
 clean:
-	rm -f dwl *.o *-protocol.h
+	rm -rf $(BUILD) $(BIN)
 
 dist: clean
 	mkdir -p dwl-$(VERSION)
-	cp -R LICENSE* Makefile CHANGELOG.md README.md client.h config.def.h \
-		config.mk protocols dwl.1 dwl.c util.c util.h dwl.desktop \
+	cp -R LICENSE Makefile CHANGELOG.md README.md src \
+		config.mk protocols dwl.1 dwl.desktop \
 		dwl-$(VERSION)
 	tar -caf dwl-$(VERSION).tar.gz dwl-$(VERSION)
 	rm -rf dwl-$(VERSION)
 
-install: dwl
+install: $(BIN)/dwl
 	mkdir -p $(DESTDIR)$(PREFIX)/bin
 	rm -f $(DESTDIR)$(PREFIX)/bin/dwl
-	cp -f dwl $(DESTDIR)$(PREFIX)/bin
+	cp -f $(BIN)/dwl $(DESTDIR)$(PREFIX)/bin
 	chmod 755 $(DESTDIR)$(PREFIX)/bin/dwl
 	mkdir -p $(DESTDIR)$(MANDIR)/man1
 	cp -f dwl.1 $(DESTDIR)$(MANDIR)/man1
@@ -74,6 +90,5 @@ uninstall:
 	rm -f $(DESTDIR)$(PREFIX)/bin/dwl $(DESTDIR)$(MANDIR)/man1/dwl.1 \
 		$(DESTDIR)$(DATADIR)/wayland-sessions/dwl.desktop
 
-.SUFFIXES: .c .o
-.c.o:
+%.c %.o:
 	$(CC) $(CPPFLAGS) $(DWLCFLAGS) -o $@ -c $<