From e2e5e98bcd0badcd437b8a67aa0986ed6d6678a9 Mon Sep 17 00:00:00 2001
From: Michael Forney <mforney@mforney.org>
Date: Fri, 5 Jul 2019 20:31:33 -0700
Subject: Use a separate preprocessor rule

Otherwise, we end up passing both -c and -E to the compiler.
---
 rules.ninja | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'rules.ninja')

diff --git a/rules.ninja b/rules.ninja
index b4cd0187..f9a42064 100644
--- a/rules.ninja
+++ b/rules.ninja
@@ -9,6 +9,12 @@ rule cc
   deps = gcc
   description = CC $out
 
+rule cpp
+  command = $cc -MMD -MF $out.d $cflags -E -P -o $out $in
+  depfile = $out.d
+  deps = gcc
+  description = CPP $out
+
 rule as
   command = $as $asflags -o $out $in
 
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