From 4f5b1c75a9427c26df0bb92c92f3d8c6370a371a Mon Sep 17 00:00:00 2001
From: Laszlo Agocs <lagocs83@gmail.com>
Date: Thu, 9 Jan 2025 17:49:24 +0100
Subject: [PATCH] QVulkanDefaultInstance: warn if setting flags has no effect

Pick-to: 6.9
Change-Id: Ib939e56f0e8bc3e04725fb3660d30a8d3e13fad3
Reviewed-by: Andy Nichols <andy.nichols@qt.io>
Reviewed-by: Kristoffer Skau <kristoffer.skau@qt.io>
---
 src/gui/vulkan/qvulkandefaultinstance.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/gui/vulkan/qvulkandefaultinstance.cpp b/src/gui/vulkan/qvulkandefaultinstance.cpp
index b4f343cf177..2a0b1d3d705 100644
--- a/src/gui/vulkan/qvulkandefaultinstance.cpp
+++ b/src/gui/vulkan/qvulkandefaultinstance.cpp
@@ -17,9 +17,11 @@ QVulkanDefaultInstance::Flags QVulkanDefaultInstance::flags()
     return s_vulkanInstanceFlags;
 }
 
-// As always, calling this when hasInstance() is already true has no effect. (unless cleanup() is called)
 void QVulkanDefaultInstance::setFlag(Flag flag, bool on)
 {
+    if (hasInstance())
+        qWarning("QVulkanDefaultInstance::setFlag called when Vulkan instance is already created; this has no effect");
+
     s_vulkanInstanceFlags.setFlag(flag, on);
 }