From af16d8ba5c9680febadeeed51a9be4bb5e9bf1d5 Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Mon, 13 Nov 2017 15:24:37 +0100
Subject: [PATCH] Explicitly set "update = checkout" option for submodules

It seems that older Git versions don't update submodules when issuing
just "git submodule update" if this option is not set.

We might actually prefer to use "update = rebase" but for now use the
smallest change that will (hopefully) allow people using older Git
versions to get the submodule updates.
---
 .gitmodules | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/.gitmodules b/.gitmodules
index 866d374c8b..ec57ac48de 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,23 +1,29 @@
 [submodule "3rdparty/catch"]
 	path = 3rdparty/catch
 	url = https://github.com/wxWidgets/Catch.git
+	update = checkout
 [submodule "src/zlib"]
 	path = src/zlib
 	url = https://github.com/wxWidgets/zlib.git
 	branch = wx
+	update = checkout
 [submodule "src/png"]
 	path = src/png
 	url = https://github.com/wxWidgets/libpng.git
 	branch = wx
+	update = checkout
 [submodule "src/expat"]
 	path = src/expat
 	url = https://github.com/wxWidgets/libexpat.git
 	branch = wx
+	update = checkout
 [submodule "src/tiff"]
 	path = src/tiff
 	url = https://github.com/wxWidgets/libtiff.git
 	branch = wx
+	update = checkout
 [submodule "src/jpeg"]
 	path = src/jpeg
 	url = https://github.com/wxWidgets/libjpeg-turbo.git
 	branch = wx
+	update = checkout