From a468a33649df8563dd824cdf224cdc2a0631c3e4 Mon Sep 17 00:00:00 2001
From: Michael Forney <mforney@mforney.org>
Date: Tue, 12 Apr 2016 22:35:17 -0700
Subject: Add dependency tracking to cc rule

---
 rules.ninja | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/rules.ninja b/rules.ninja
index 63e5eab5..43e84027 100644
--- a/rules.ninja
+++ b/rules.ninja
@@ -4,7 +4,9 @@ rule gen
 
 # toolchain
 rule cc
-  command = $cc $cflags -c -o $out $in
+  command = $cc -MMD -MF $out.d $cflags -c -o $out $in
+  depfile = $out.d
+  deps = gcc
 
 rule link
   command = $cc $ldflags -o $out $in
-- 
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