Short live Q_CONSTINIT!

It expands to the first available of

- constinit (C++20)
- [[clang::require_constant_initialization]] (Clang)
- __constinit (GCC >= 10)

Use it around the code (on and near static QBasicAtomic; this patch
makes no attempt to find all statics in qtbase).

[ChangeLog][QtCore][QtGlobal] Added macro Q_CONSTINIT.

Fixes: QTBUG-100484
Change-Id: I11e0363a7acb3464476859d12ec7f94319d82be7
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>

2 files changed, 2 insertions, 2 deletions

diff --git a/src/network/kernel/qauthenticator.cpp b/src/network/kernel/qauthenticator.cpp
index 97f4a2cba4..9b398d7079 100644
--- a/src/network/kernel/qauthenticator.cpp
+++ b/src/network/kernel/qauthenticator.cpp
@@ -1574,7 +1574,7 @@ static PSecurityFunctionTableW pSecurityFunctionTable = nullptr;
 
 static bool q_SSPI_library_load()
 {
-    static QBasicMutex mutex;
+    Q_CONSTINIT static QBasicMutex mutex;
     QMutexLocker l(&mutex);
 
     if (pSecurityFunctionTable == nullptr)
diff --git a/src/network/kernel/qnetworkinformation.cpp b/src/network/kernel/qnetworkinformation.cpp
index 836b63bd4b..626439572a 100644
--- a/src/network/kernel/qnetworkinformation.cpp
+++ b/src/network/kernel/qnetworkinformation.cpp
@@ -124,7 +124,7 @@ bool QNetworkInformationPrivate::initializeList()
         return false;
     if (!dataHolder())
         return false;
-    static QBasicMutex mutex;
+    Q_CONSTINIT static QBasicMutex mutex;
     QMutexLocker initLocker(&mutex);
 
 #if QT_CONFIG(library)