From e8f6d1f79af24e1433e84f859aae89d0787a2cd1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Blissing?= <bjorn@blissing.se>
Date: Sun, 6 Oct 2024 21:40:49 +0200
Subject: [PATCH] Add QT_USE_NAMESPACE macro (#6864)

The macro `QT_USE_NAMESPACE` should expand to nothing for most Qt
builds, i.e. built with an empty `QT_NAMESPACE` variable.

However if Qt is built using a custom namespace then all forward
declarations must be wrapped with `QT_BEGIN_NAMESPACE` and
`QT_END_NAMESPACE`. Today CppCheck defines these macros as empty, thus
`QT_USE_NAMESPACE` should be empty as well.

Reference:
https://wiki.qt.io/Qt_In_Namespace
---
 cfg/qt.cfg | 1 +
 1 file changed, 1 insertion(+)

diff --git a/cfg/qt.cfg b/cfg/qt.cfg
index fef035130c0..08ea9d9d7c5 100644
--- a/cfg/qt.cfg
+++ b/cfg/qt.cfg
@@ -5368,6 +5368,7 @@
   <define name="Q_RETURN_ARG(type, data)" value="QReturnArgument&lt;type &gt;(#type, data)"/>
   <define name="Q_UNLIKELY(expr)" value="expr"/>
   <define name="Q_UNUSED(X)" value="(void)(X);"/>
+  <define name="QT_USE_NAMESPACE" value=""/>
   <define name="QT_BEGIN_NAMESPACE" value=""/>
   <define name="QT_END_NAMESPACE" value=""/>
   <define name="QT_BEGIN_MOC_NAMESPACE" value=""/>