From 25025a5471d609d57f59e5d79ab7519635bfe95b Mon Sep 17 00:00:00 2001
From: Tom Finegan <tomfinegan@google.com>
Date: Mon, 19 Aug 2013 11:03:45 -0700
Subject: [PATCH] Add dependency checks to Makefile.

Avoid unfortunate things like breaking the library because the make file
was not previously checking dependencies.

Change-Id: Iab20c3cfa0d1475dfb5c54127646b351df1c4c50
---
 Makefile | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index a2186a8..e9a60a4 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 CXX       := g++
-CXXFLAGS  := -W -Wall -g
+CXXFLAGS  := -W -Wall -g -MMD -MP
 LIBWEBMA  := libwebm.a
 LIBWEBMSO := libwebm.so
 WEBMOBJS  := mkvparser.o mkvreader.o mkvmuxer.o mkvmuxerutil.o mkvwriter.o
@@ -10,6 +10,8 @@ OBJECTS2  := sample_muxer.o vttreader.o webvttparser.o sample_muxer_metadata.o
 OBJECTS3  := dumpvtt.o vttreader.o webvttparser.o
 OBJECTS4  := vttdemux.o webvttparser.o
 INCLUDES  := -I.
+DEPS      := $(WEBMOBJS:.o=.d) $(OBJECTS1:.o=.d) $(OBJECTS2:.o=.d)
+DEPS      += $(OBJECTS3:.o=.d) $(OBJECTS4:.o=.d)
 EXES      := samplemuxer sample dumpvtt vttdemux
 
 all: $(EXES)
@@ -44,4 +46,8 @@ libwebm.so: $(OBJSSO)
 	$(CXX) -c $(CXXFLAGS) -fPIC $(INCLUDES) $< -o $@
 
 clean:
-	$(RM) -f $(OBJECTS1) $(OBJECTS2) $(OBJECTS3) $(OBJECTS4) $(OBJSA) $(OBJSSO) $(LIBWEBMA) $(LIBWEBMSO) $(EXES) Makefile.bak
+	$(RM) -f $(OBJECTS1) $(OBJECTS2) $(OBJECTS3) $(OBJECTS4) $(OBJSA) $(OBJSSO) $(LIBWEBMA) $(LIBWEBMSO) $(EXES) $(DEPS) Makefile.bak
+
+ifneq ($(MAKECMDGOALS), clean)
+  -include $(DEPS)
+endif