diff --git a/src/corelib/CMakeLists.txt b/src/corelib/CMakeLists.txt
index f2c7519aba5..8c1c214808b 100644
--- a/src/corelib/CMakeLists.txt
+++ b/src/corelib/CMakeLists.txt
@@ -68,6 +68,7 @@ qt_internal_add_module(Core
         global/qoverload.h
         global/qprocessordetection.h
         global/qrandom.cpp global/qrandom.h global/qrandom_p.h
+        global/qstdlibdetection.h
         global/qswap.h
         global/qsysinfo.cpp global/qsysinfo.h
         global/qsystemdetection.h
diff --git a/src/corelib/global/qstdlibdetection.h b/src/corelib/global/qstdlibdetection.h
new file mode 100644
index 00000000000..64c588237f9
--- /dev/null
+++ b/src/corelib/global/qstdlibdetection.h
@@ -0,0 +1,60 @@
+// Copyright (C) 2025 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#if 0
+#pragma qt_class(QtStdLibDetection)
+#pragma qt_sync_skip_header_check
+#pragma qt_sync_stop_processing
+#endif
+
+#ifndef QSTDLIBDETECTION_H
+#define QSTDLIBDETECTION_H
+
+#include <QtCore/qtconfiginclude.h>
+
+#ifdef __cplusplus
+
+/* If <version> exists, qtconfiginclude.h will have included it. */
+/* If not, we need to include _something_, and <utility> is included by qcompilerdetection.h, too */
+#if !__has_include(<version>)
+#  include <utility>
+#endif
+
+/*
+   The std lib, must be one of: (Q_STL_x)
+
+     LIBCPP       - libc++ (shipped with Clang, e.g.)
+     LIBSTDCPP    - libstdc++ (shipped with GCC, e.g.)
+     MSSTL        - Microsoft STL
+     DINKUMWARE   - Dinkumware (shipped with QNX, VxWorks, Integrity, origin of MSSTL)
+     STLPORT      - STLport (merged with SGI)
+     SGI          - The original STL
+     ROGUEWAVE    - RogueWave ((used to be) popular on ARM?)
+
+   Not included:
+     EASTL        - EASTL (this is not a drop-in STL, e.g. it doesn't have <vector>-style headers)
+
+   Should be sorted most to least authoritative.
+*/
+
+#if defined(_LIBCPP_VERSION) /* libc++ */
+#  define Q_STL_LIBCPP
+#elif defined(_GLIBCXX_RELEASE) /* libstdc++ */
+#  define Q_STL_LIBSTDCPP
+#elif defined(_MSVC_STL_VERSION) /* MSSTL (must be before Dinkumware) */
+#  define Q_STL_MSSTL
+#elif defined(_YVALS) || defined(_CPPLIB_VER) /* Dinkumware */
+#  define Q_STL_DINKUMWARE
+#elif defined(_STLPORT_VERSION) /* STLport, cf. _stlport_version.h */
+#  define Q_STL_STLPORT
+#elif defined(__SGI_STL) /* must be after STLport, which mimics as SGI STL */
+#  define Q_STL_SGI
+#elif defined(_RWSTD_VER) /* RogueWave, at least as contributed to Apache stdcxx, cf. rw/_config.h */
+#  define Q_STL_ROGUEWAVE
+#else
+#  error Unknown std library implementation, please file a report at bugreports.qt.io.
+#endif
+
+#endif // __cplusplus
+
+#endif // QSTDLIBDETECTION_H