From b1395a86ba7e1dbfedc1dfd6ea1db9d981c4d8ca Mon Sep 17 00:00:00 2001
From: James Turner <zakalawe@mac.com>
Date: Thu, 9 Apr 2020 15:48:03 +0100
Subject: [PATCH] =?UTF-8?q?Add=20=E2=80=94disable-hold-short=20option=20fo?=
 =?UTF-8?q?r=20MP?=
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Allow explicit disabling of the hold-short behaviour when it causes
problems.
---
 src/Main/options.cxx      | 5 ++---
 src/Main/positioninit.cxx | 4 +++-
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/src/Main/options.cxx b/src/Main/options.cxx
index cd7b4d3d6..729bad95f 100644
--- a/src/Main/options.cxx
+++ b/src/Main/options.cxx
@@ -21,9 +21,7 @@
 // $Id$
 
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif
+#include <config.h>
 
 #include <simgear/compiler.h>
 #include <simgear/structure/exception.hxx>
@@ -1720,6 +1718,7 @@ struct OptionDesc {
     {"notrim",                       false, OPTION_BOOL,   "/sim/presets/trim", false, "", 0 },
     {"on-ground",                    false, OPTION_BOOL,   "/sim/presets/onground", true, "", 0 },
     {"in-air",                       false, OPTION_BOOL,   "/sim/presets/onground", false, "", 0 },
+    {"disable-hold-short",           false, OPTION_BOOL,   "/sim/presets/mp-hold-short-override", true, "", 0 },
     {"fog-disable",                  false, OPTION_STRING, "/sim/rendering/fog", false, "disabled", 0 },
     {"fog-fastest",                  false, OPTION_STRING, "/sim/rendering/fog", false, "fastest", 0 },
     {"fog-nicest",                   false, OPTION_STRING, "/sim/rendering/fog", false, "nicest", 0 },
diff --git a/src/Main/positioninit.cxx b/src/Main/positioninit.cxx
index 49bc0d694..42503eee8 100644
--- a/src/Main/positioninit.cxx
+++ b/src/Main/positioninit.cxx
@@ -180,7 +180,9 @@ std::tuple<SGGeod, double> runwayStartPos(FGRunwayRef runway)
     double startOffset = fgGetDouble("/sim/airport/runways/start-offset-m", 5.0);
     SGGeod pos = runway->pointOnCenterline(startOffset);
 
-    if (FGIO::isMultiplayerRequested() && (fabs(offsetNm) <0.1)) {
+    const bool overrideHoldShort = fgGetBool("/sim/presets/mp-hold-short-override", false);
+
+    if (!overrideHoldShort && FGIO::isMultiplayerRequested() && (fabs(offsetNm) <0.1)) {
         SG_LOG( SG_GENERAL, SG_WARN, "Requested to start on " << runway->airport()->ident() << "/" <<
                runway->ident() << ", MP is enabled so computing hold short position to avoid runway incursion");