>From 3506215dcd6a4dbf6b45625290b8d6999da5436c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?P=C3=A1draig=20Brady?= <address@hidden>
Date: Wed, 25 Nov 2015 13:38:29 +0000
Subject: [PATCH] build: avoid makeinfo unless required

* doc/local.mk (constants.texi): Avoid calling makeinfo unless
the constants derived from tail and shred have changed.
This avoid's a dependence on makeinfo from patch sources,
and avoids an expensive makeinfo call for developers.
---
 doc/local.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/doc/local.mk b/doc/local.mk
index 37c5621..c4b693c 100644
--- a/doc/local.mk
+++ b/doc/local.mk
@@ -42,7 +42,7 @@ doc/constants.texi: $(top_srcdir)/src/tail.c $(top_srcdir)/src/shred.c
 	  sed -n -e \
 	      's/.*\(DEFAULT_PASSES\)[ =]* \([0-9]*\).*/@set SHRED_\1 \2/p'\
 	    $(top_srcdir)/src/shred.c; } > $@-t \
-	  && mv $@-t $@
+	  && { cmp -s $@-t $@ 2>/dev/null || mv $@-t $@; }
 
 MAINTAINERCLEANFILES += doc/constants.texi
 
-- 
2.5.0