From 2d526a14383939180456f64c0de7c985b2332ff4 Mon Sep 17 00:00:00 2001
From: Jesse Luehrs <doy@tozt.net>
Date: Sun, 13 Apr 2014 21:23:42 -0400
Subject: have the makefile generate dependencies

---
 .gitignore |  1 +
 Makefile   | 16 ++++++++++++----
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/.gitignore b/.gitignore
index 97d3851..c7267e5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 *.o
+.*.d
 runes
diff --git a/Makefile b/Makefile
index 0be5373..8c5df71 100644
--- a/Makefile
+++ b/Makefile
@@ -4,18 +4,26 @@ LIBS     = cairo cairo-xlib libuv
 CFLAGS  ?= -g -Wall -Wextra -Werror
 LDFLAGS ?= -g -Wall -Wextra -Werror
 
+ALLCFLAGS  = $(shell pkg-config --cflags $(LIBS)) $(CFLAGS)
+ALLLDFLAGS = $(shell pkg-config --libs $(LIBS)) $(LDFLAGS)
+
+MAKEDEPEND = $(CC) $(ALLCFLAGS) -M -MP -MT '$@ $(@:%.o=.%.d)'
+
 build: $(OUT)
 
 $(OUT): $(OBJ)
-	$(CC) $(shell pkg-config --libs $(LIBS)) $(LDFLAGS) -o $@ $^
+	$(CC) $(ALLLDFLAGS) -o $@ $^
 
 %.o: %.c
-	$(CC) $(shell pkg-config --cflags $(LIBS)) $(CFLAGS) -c -o $@ $^
+	@$(MAKEDEPEND) -o $(<:%.c=.%.d) $<
+	$(CC) $(ALLCFLAGS) -c -o $@ $<
 
 %.c: %.l
-	$(LEX) -o $@ $^
+	$(LEX) -o $@ $<
 
 clean:
-	rm -f $(OUT) $(OBJ)
+	rm -f $(OUT) $(OBJ) $(OBJ:%.o=.%.d)
+
+-include $(OBJ:%.o=.%.d)
 
 .PHONY: build clean
-- 
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