From 34f20fcc4a0abeef93bcc5995f2e083f1cf93c0f Mon Sep 17 00:00:00 2001
From: =?utf8?q?P=C3=A1draig=20Brady?= <P@draigBrady.com>
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 avoids a dependence on makeinfo from patched 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 37c5621e3e..a270c1faab 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 $@-t $@ >/dev/null 2>&1 || mv $@-t $@; }
 
 MAINTAINERCLEANFILES += doc/constants.texi
 
-- 
2.47.2