diff --git a/tests/auto/corelib/io/qprocess/crasher.h b/tests/auto/corelib/io/qprocess/crasher.h
index f1ca82a86b7..6b27e4f6790 100644
--- a/tests/auto/corelib/io/qprocess/crasher.h
+++ b/tests/auto/corelib/io/qprocess/crasher.h
@@ -5,37 +5,11 @@
 #if defined(_MSC_VER)
 #  include <intrin.h>
 #endif
-#if __has_include(<signal.h>)
-#  include <signal.h>
-#endif
-#if __has_include(<sys/resource.h>)
-#  include <sys/resource.h>
-#endif
-
 #ifndef __has_builtin
 #  define __has_builtin(x)  0
 #endif
 
 namespace tst_QProcessCrash {
-struct NoCoreDumps
-{
-#if defined(RLIMIT_CORE)
-    struct rlimit rlim;
-    NoCoreDumps()
-    {
-        if (getrlimit(RLIMIT_CORE, &rlim) == 0 && rlim.rlim_cur != 0) {
-            struct rlimit newrlim = rlim;
-            newrlim.rlim_cur = 0;
-            setrlimit(RLIMIT_CORE, &newrlim);
-        }
-    }
-    ~NoCoreDumps()
-    {
-        setrlimit(RLIMIT_CORE, &rlim);
-    }
-#endif // RLIMIT_CORE
-};
-
 void crashFallback(volatile int *ptr = nullptr)
 {
     *ptr = 0;
diff --git a/tests/auto/corelib/io/qprocess/testProcessCrash/CMakeLists.txt b/tests/auto/corelib/io/qprocess/testProcessCrash/CMakeLists.txt
index 2f167899eb8..02c04c6ad16 100644
--- a/tests/auto/corelib/io/qprocess/testProcessCrash/CMakeLists.txt
+++ b/tests/auto/corelib/io/qprocess/testProcessCrash/CMakeLists.txt
@@ -10,4 +10,5 @@ qt_internal_add_executable(testProcessCrash
     CORE_LIBRARY None
     SOURCES
         main.cpp
+        ../../../../../shared/disablecoredumps.cpp
 )
diff --git a/tests/auto/corelib/io/qprocess/testProcessCrash/main.cpp b/tests/auto/corelib/io/qprocess/testProcessCrash/main.cpp
index a5f1eef88a9..384ac6f17d8 100644
--- a/tests/auto/corelib/io/qprocess/testProcessCrash/main.cpp
+++ b/tests/auto/corelib/io/qprocess/testProcessCrash/main.cpp
@@ -7,8 +7,6 @@ using namespace tst_QProcessCrash;
 
 int main()
 {
-    [[maybe_unused]] // NoCoreDumps may be an empty struct, not a RAII class
-    NoCoreDumps disableCoreDumps;
     crash();
     return 0;
 }
diff --git a/tests/auto/corelib/io/qprocess/tst_qprocess.cpp b/tests/auto/corelib/io/qprocess/tst_qprocess.cpp
index 704696e2c24..355e75abdc8 100644
--- a/tests/auto/corelib/io/qprocess/tst_qprocess.cpp
+++ b/tests/auto/corelib/io/qprocess/tst_qprocess.cpp
@@ -22,6 +22,7 @@
 #include <qplatformdefs.h>
 #ifdef Q_OS_UNIX
 #  include <private/qcore_unix_p.h>
+#  include <sys/resource.h>
 #  include <sys/wait.h>
 #endif
 
@@ -1491,8 +1492,25 @@ void tst_QProcess::createProcessArgumentsModifier()
 static constexpr int sigs[] = { SIGABRT, SIGILL, SIGSEGV };
 struct DisableCrashLogger
 {
+#if defined(RLIMIT_CORE)
     // disable core dumps too
-    tst_QProcessCrash::NoCoreDumps disableCoreDumps {};
+    struct NoCoreDumps {
+        struct rlimit rlim;
+        NoCoreDumps()
+        {
+            if (getrlimit(RLIMIT_CORE, &rlim) == 0 && rlim.rlim_cur != 0) {
+                struct rlimit newrlim = rlim;
+                newrlim.rlim_cur = 0;
+                setrlimit(RLIMIT_CORE, &newrlim);
+            }
+        }
+        ~NoCoreDumps()
+        {
+            setrlimit(RLIMIT_CORE, &rlim);
+        }
+    } disableCoreDumps;
+#endif // RLIMIT_CORE
+
     std::array<struct sigaction, std::size(sigs)> oldhandlers;
     DisableCrashLogger()
     {
diff --git a/tests/auto/network/socket/qtcpserver/crashingServer/CMakeLists.txt b/tests/auto/network/socket/qtcpserver/crashingServer/CMakeLists.txt
index bb1feb02379..348075f8d3f 100644
--- a/tests/auto/network/socket/qtcpserver/crashingServer/CMakeLists.txt
+++ b/tests/auto/network/socket/qtcpserver/crashingServer/CMakeLists.txt
@@ -1,17 +1,12 @@
 # Copyright (C) 2022 The Qt Company Ltd.
 # SPDX-License-Identifier: BSD-3-Clause
 
-#####################################################################
-## crashingServer Binary:
-#####################################################################
-
 qt_internal_add_executable(crashingServer
     OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/"
     SOURCES
         main.cpp
+        ../../../../../shared/disablecoredumps.cpp
     LIBRARIES
         Qt::Network
 )
 
-## Scopes:
-#####################################################################
diff --git a/tests/auto/network/socket/qtcpserver/crashingServer/main.cpp b/tests/auto/network/socket/qtcpserver/crashingServer/main.cpp
index 63bd7b1e078..ed7f557c18e 100644
--- a/tests/auto/network/socket/qtcpserver/crashingServer/main.cpp
+++ b/tests/auto/network/socket/qtcpserver/crashingServer/main.cpp
@@ -7,27 +7,12 @@
 
 #include <QtCore/qcoreapplication.h>
 
-#if defined(Q_OS_WIN) && defined(Q_CC_MSVC)
-#  include <crtdbg.h>
-#endif
 #ifdef Q_OS_UNIX
-#  include <sys/resource.h>
 #  include <unistd.h>
 #endif
 
 int main(int argc, char *argv[])
 {
-#if defined(Q_OS_WIN) && defined(Q_CC_MSVC)
-    // Windows: Suppress crash notification dialog.
-    _CrtSetReportMode(_CRT_ERROR, _CRTDBG_MODE_DEBUG);
-#elif defined(RLIMIT_CORE)
-    // Unix: set our core dump limit to zero to request no dialogs.
-    if (struct rlimit rlim; getrlimit(RLIMIT_CORE, &rlim) == 0) {
-        rlim.rlim_cur = 0;
-        setrlimit(RLIMIT_CORE, &rlim);
-    }
-#endif
-
     QCoreApplication app(argc, argv);
     if (argc < 1) {
         fprintf(stderr, "Need a port number\n");
diff --git a/tests/auto/testlib/selftests/crashes/CMakeLists.txt b/tests/auto/testlib/selftests/crashes/CMakeLists.txt
index c11bab90d0b..324b3cbedcd 100644
--- a/tests/auto/testlib/selftests/crashes/CMakeLists.txt
+++ b/tests/auto/testlib/selftests/crashes/CMakeLists.txt
@@ -11,6 +11,7 @@ qt_internal_add_executable(crashes
     OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
     SOURCES
         tst_crashes.cpp
+        ../../../../shared/disablecoredumps.cpp
     LIBRARIES
         Qt::Test
 )
diff --git a/tests/auto/testlib/selftests/crashes/tst_crashes.cpp b/tests/auto/testlib/selftests/crashes/tst_crashes.cpp
index 4ba8a426e6b..d3dc2922cb0 100644
--- a/tests/auto/testlib/selftests/crashes/tst_crashes.cpp
+++ b/tests/auto/testlib/selftests/crashes/tst_crashes.cpp
@@ -21,16 +21,6 @@ private slots:
 
 void tst_Crashes::crash()
 {
-#if defined(Q_OS_WIN)
-   //we avoid the error dialogbox to appear on windows
-   SetErrorMode( SEM_NOGPFAULTERRORBOX | SEM_FAILCRITICALERRORS | SEM_NOOPENFILEERRORBOX);
-#elif defined(RLIMIT_CORE)
-    // Unix: set our core dump limit to zero to request no dialogs.
-    if (struct rlimit rlim; getrlimit(RLIMIT_CORE, &rlim) == 0) {
-        rlim.rlim_cur = 0;
-        setrlimit(RLIMIT_CORE, &rlim);
-    }
-#endif
     /*
         We deliberately dereference an invalid but non-zero address;
         it should be non-zero because a few platforms may have special crash behavior
diff --git a/tests/auto/testlib/selftests/silent_fatal/CMakeLists.txt b/tests/auto/testlib/selftests/silent_fatal/CMakeLists.txt
index e4b59e399ff..2cdc714ed0b 100644
--- a/tests/auto/testlib/selftests/silent_fatal/CMakeLists.txt
+++ b/tests/auto/testlib/selftests/silent_fatal/CMakeLists.txt
@@ -7,6 +7,7 @@ qt_internal_add_executable(silent_fatal
     OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
     SOURCES
         tst_silent_fatal.cpp
+        ../../../../shared/disablecoredumps.cpp
     LIBRARIES
         Qt::TestPrivate
 )
diff --git a/tests/auto/testlib/selftests/silent_fatal/tst_silent_fatal.cpp b/tests/auto/testlib/selftests/silent_fatal/tst_silent_fatal.cpp
index a7b4324992d..57aa1f702cc 100644
--- a/tests/auto/testlib/selftests/silent_fatal/tst_silent_fatal.cpp
+++ b/tests/auto/testlib/selftests/silent_fatal/tst_silent_fatal.cpp
@@ -5,29 +5,6 @@
 #include <QTest>
 #include <private/qtestlog_p.h>
 
-#if defined(Q_OS_WIN) && defined(Q_CC_MSVC)
-#  include <crtdbg.h>
-#endif
-#ifdef Q_OS_UNIX
-#  include <sys/resource.h>
-#  include <unistd.h>
-#endif
-
-void disableCoreDumps()
-{
-#if defined(Q_OS_WIN) && defined(Q_CC_MSVC)
-    // Windows: Suppress crash notification dialog.
-    _CrtSetReportMode(_CRT_ERROR, _CRTDBG_MODE_DEBUG);
-#elif defined(RLIMIT_CORE)
-    // Unix: set our core dump limit to zero to request no dialogs.
-    if (struct rlimit rlim; getrlimit(RLIMIT_CORE, &rlim) == 0) {
-        rlim.rlim_cur = 0;
-        setrlimit(RLIMIT_CORE, &rlim);
-    }
-#endif
-}
-Q_CONSTRUCTOR_FUNCTION(disableCoreDumps)
-
 class tst_SilentFatal : public QObject
 {
     Q_OBJECT
diff --git a/tests/shared/disablecoredumps.cpp b/tests/shared/disablecoredumps.cpp
new file mode 100644
index 00000000000..326c51b3afc
--- /dev/null
+++ b/tests/shared/disablecoredumps.cpp
@@ -0,0 +1,41 @@
+// Copyright (C) 2025 Intel Corporation.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
+
+// This file is added to some test helpers that don't link to Qt, so don't
+// use Qt #includes here.
+
+#ifdef _WIN32
+#  include <windows.h>
+#else
+#  include <unistd.h>
+#endif
+#if __has_include(<sys/resource.h>)
+#  include <sys/resource.h>
+#endif
+#ifdef _MSC_VER
+#  include <crtdbg.h>
+#endif
+
+static void disableCoreDumps()
+{
+#ifdef _WIN32
+    // Windows: suppress the OS error dialog box.
+    SetErrorMode(SEM_NOGPFAULTERRORBOX | SEM_FAILCRITICALERRORS | SEM_NOOPENFILEERRORBOX);
+#  ifdef _MSC_VER
+    // MSVC: Suppress runtime's crash notification dialog.
+    _CrtSetReportMode(_CRT_ERROR, _CRTDBG_MODE_DEBUG);
+#  endif
+#elif defined(RLIMIT_CORE)
+    // Unix: set our core dump limit to zero to request no dialogs.
+    if (struct rlimit rlim; getrlimit(RLIMIT_CORE, &rlim) == 0) {
+        rlim.rlim_cur = 0;
+        setrlimit(RLIMIT_CORE, &rlim);
+    }
+#endif
+}
+
+struct DisableCoreDumps
+{
+    DisableCoreDumps() { disableCoreDumps(); }
+};
+[[maybe_unused]] DisableCoreDumps disableCoreDumpsConstructorFunction;