From 244d8b6654f765e3719fb09048e0f09dec48c374 Mon Sep 17 00:00:00 2001
From: David Forrest <drf@vims.edu>
Date: Wed, 14 Nov 2012 10:59:18 -0500
Subject: [PATCH] Makefile: add autodependencies for header files.

---
 .gitignore |  1 +
 Makefile   | 14 ++++++++++++--
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/.gitignore b/.gitignore
index 8344773..642a72b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,6 +12,7 @@
 *.i
 *.s
 *~
+.depend
 
 temporal.png
 temporal_data
diff --git a/Makefile b/Makefile
index f797024..0a1d3aa 100644
--- a/Makefile
+++ b/Makefile
@@ -130,7 +130,7 @@ endif
 
 OBJ = $(patsubst %.c,%.o,${SOURCES})
 
-.PHONY: all program clean size subdirs doc functionsbysize
+.PHONY: all program clean size subdirs doc functionsbysize depend
 .PRECIOUS: %.o %.elf
 
 all: config.h subdirs $(PROGRAM).hex $(PROGRAM).lst $(PROGRAM).sym size
@@ -150,7 +150,7 @@ program: $(PROGRAM).hex config.h
 	stty 115200 raw ignbrk -hup -echo ixoff < $(PROGPORT)
 
 clean: clean-subdirs
-	rm -rf *.o *.elf *.lst *.map *.sym *.lss *.eep *.srec *.bin *.hex *.al *.i *.s *~
+	rm -rf *.o *.elf *.lst *.map *.sym *.lss *.eep *.srec *.bin *.hex *.al *.i *.s *~ .depend
 
 clean-subdirs:
 	@for dir in $(SUBDIRS); do \
@@ -176,6 +176,16 @@ doc: Doxyfile *.c *.h
 functionsbysize: $(OBJ)
 	@avr-objdump -h $^ | grep '\.text\.' | perl -ne '/\.text\.(\S+)\s+([0-9a-f]+)/ && printf "%u\t%s\n", eval("0x$$2"), $$1;' | sort -n
 
+depend: .depend
+	@true
+
+.depend: $(SOURCES)
+	rm -f .depend
+	$(CC) $(CFLAGS) -MM $^ > .depend;
+
+# pull in dependency info
+-include .depend
+
 %.o: %.c config.h Makefile
 	@echo "  CC        $@"
 	@$(CC) -c $(CFLAGS) -Wa,-adhlns=$(<:.c=.al) -o $@ $(subst .o,.c,$@)