From a077708d356b8c6c896cac91a44848115a574bd2 Mon Sep 17 00:00:00 2001
From: Baptiste Daroussin <bapt@FreeBSD.org>
Date: Sat, 8 Apr 2017 08:46:02 +0000
Subject: [PATCH] add a stub --speed-large-files for compatibility with GNU
 diff

There is no intention to implement it, but lots of scripts/tools using
diff(1) passes GNU diff option
---
 usr.bin/diff/diff.1 | 7 ++++++-
 usr.bin/diff/diff.c | 4 ++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/usr.bin/diff/diff.1 b/usr.bin/diff/diff.1
index 7ec168283b9e..aeb4ee15df1a 100644
--- a/usr.bin/diff/diff.1
+++ b/usr.bin/diff/diff.1
@@ -30,7 +30,7 @@
 .\"     @(#)diff.1	8.1 (Berkeley) 6/30/93
 .\" $FreeBSD$
 .\"
-.Dd March 22, 2017
+.Dd April 8, 2017
 .Dt DIFF 1
 .Os
 .Sh NAME
@@ -57,6 +57,7 @@
 .Op Fl -rcs
 .Op Fl -show-c-function
 .Op Fl -starting-file
+.Op Fl -speed-large-files
 .Op Fl -strip-trailing-cr
 .Op Fl -tabsize
 .Op Fl -text
@@ -82,6 +83,7 @@
 .Op Fl -paginate
 .Op Fl -rcs
 .Op Fl -show-c-function
+.Op Fl -speed-large-files
 .Op Fl -starting-file
 .Op Fl -strip-trailing-cr
 .Op Fl -tabsize
@@ -105,6 +107,7 @@
 .Op Fl -paginate
 .Op Fl -rcs
 .Op Fl -show-c-function
+.Op Fl -speed-large-files
 .Op Fl -starting-file
 .Op Fl -strip-trailing-cr
 .Op Fl -tabsize
@@ -129,6 +132,7 @@
 .Op Fl -paginate
 .Op Fl -rcs
 .Op Fl -show-c-function
+.Op Fl -speed-large-files
 .Op Fl -starting-file
 .Op Fl -strip-trailing-cr
 .Op Fl -tabsize
@@ -159,6 +163,7 @@
 .Op Fl -recursive
 .Op Fl -report-identical-files
 .Op Fl -show-c-function
+.Op Fl -speed-large-files
 .Op Fl -strip-trailing-cr
 .Op Fl -tabsize
 .Op Fl -text
diff --git a/usr.bin/diff/diff.c b/usr.bin/diff/diff.c
index fd0e76ca3b67..ebb4f21c7bf2 100644
--- a/usr.bin/diff/diff.c
+++ b/usr.bin/diff/diff.c
@@ -55,6 +55,7 @@ enum {
 	OPT_NO_IGN_FN_CASE,
 	OPT_NORMAL,
 	OPT_HORIZON_LINES,
+	OPT_SPEED_LARGE_FILES,
 };
 
 static struct option longopts[] = {
@@ -87,6 +88,7 @@ static struct option longopts[] = {
 	{ "horizon-lines",		required_argument,	NULL,	OPT_HORIZON_LINES },
 	{ "no-ignore-file-name-case",	no_argument,		NULL,	OPT_NO_IGN_FN_CASE },
 	{ "normal",			no_argument,		NULL,	OPT_NORMAL },
+	{ "speed-large-files",		no_argument,		NULL,	OPT_SPEED_LARGE_FILES},
 	{ "strip-trailing-cr",		no_argument,		NULL,	OPT_STRIPCR },
 	{ "tabsize",			optional_argument,	NULL,	OPT_TSIZE },
 	{ NULL,				0,			0,	'\0'}
@@ -245,6 +247,8 @@ main(int argc, char **argv)
 				usage();
 			}
 			break;
+		case OPT_SPEED_LARGE_FILES:
+			break; /* ignore but needed for compatibility with GNU diff */
 		case OPT_STRIPCR:
 			dflags |= D_STRIPCR;
 			break;