From fe0961cd719a9097471b14651af4144149494dea Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Thu, 30 Dec 2021 13:14:27 +0000
Subject: [PATCH] Dir.sd.mk: Prevent builtin make rule overwriting conffile.c

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---
 Dir.sd.mk | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Dir.sd.mk b/Dir.sd.mk
index 4f16b25..d65cc92 100644
--- a/Dir.sd.mk
+++ b/Dir.sd.mk
@@ -78,6 +78,12 @@ STALE_PYTHON_FILES=	$(foreach e, py pyc, \
 %.yy.c %.yy.h:	%.fl
 	flex --header=$*.yy.h -o$*.yy.c $<
 
+%.c: %.y
+# make has a builtin rule to run yacc, but we don't want that because
+# our conffile.c is handwritten, and we use conffile.yy.c for the
+# bison output.  There is no need to do likewise for flex because
+# our flex input files are end in .fl, not .l.
+
 %.tab.c %.tab.h:	%.y
 	bison -d -o $@ $<
 
-- 
2.30.2