From deb19e1574621ea3dfafaaa3963e4164ba2d2684 Mon Sep 17 00:00:00 2001
From: whitequark <whitequark@whitequark.org>
Date: Wed, 26 Aug 2020 16:53:47 +0000
Subject: [PATCH] Add -MP to CXXFLAGS.

This avoids an issue where deleting or moving headers breaks the next
incremental build until the outdated *.d files are deleted.
---
 Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 444678e9d..7bc2fe490 100644
--- a/Makefile
+++ b/Makefile
@@ -82,7 +82,7 @@ all: top-all
 YOSYS_SRC := $(dir $(firstword $(MAKEFILE_LIST)))
 VPATH := $(YOSYS_SRC)
 
-CXXFLAGS := $(CXXFLAGS) -Wall -Wextra -ggdb -I. -I"$(YOSYS_SRC)" -MD -D_YOSYS_ -fPIC -I$(PREFIX)/include
+CXXFLAGS := $(CXXFLAGS) -Wall -Wextra -ggdb -I. -I"$(YOSYS_SRC)" -MD -MP -D_YOSYS_ -fPIC -I$(PREFIX)/include
 LDLIBS := $(LDLIBS) -lstdc++ -lm
 PLUGIN_LDFLAGS :=
 
-- 
2.30.2