From 9b5acacdd36ccfcf81d28916ac2371b2a97833b7 Mon Sep 17 00:00:00 2001
From: Julian Blake Kongslie
Date: Mon, 27 Jun 2022 18:46:30 -0700
Subject: Don't redo IWYU work when headers haven't changed.

---
 Makefile | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index c2838bf..0d154a8 100644
--- a/Makefile
+++ b/Makefile
@@ -59,11 +59,10 @@ endif
 
 ifdef iwyu
 
-build/$(1)/iwyu.cpp:
+build/$(1)/iwyu.cpp: $$(wildcard $(1)/*.h)
 	@mkdir -p $$(dir $$@)
 	@tools/iwyu-header $$(wildcard $(1)/*.h) > $$@
 	@$$(call iwyu,$$@)
-.PHONY: build/$(1)/iwyu.cpp
 
 IWYU_CPPS += build/$(1)/iwyu.cpp
 
-- 
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