IPC: switch the default key type on Unix to POSIX realtime

Instead of the System V one. An important difference is that
QSharedMemory does not clean after itself.

Updated the configure summary output to include this information.
Drive-by update to sorting order and I removed cpp-winrt from the
listing because there's a warning at the end if it is not set.

Change-Id: I12a088d1ae424825abd3fffd171e0eadcfd33426
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>

src/corelib/configure.cmake

@@ -614,7 +614,7 @@ qt_feature("inotify" PUBLIC PRIVATE
 )
 qt_feature_definition("inotify" "QT_NO_INOTIFY" NEGATE VALUE "1")
 qt_feature("ipc_posix"
-    LABEL "Using POSIX IPC"
+    LABEL "Defaulting legacy IPC to POSIX"
     CONDITION TEST_posix_shm AND TEST_posix_sem AND (
         FEATURE_ipc_posix OR (APPLE AND QT_FEATURE_appstore_compliant)
         OR NOT (TEST_sysv_shm AND TEST_sysv_sem)
@@ -769,6 +769,7 @@ qt_feature("xmlstream" PUBLIC
 qt_feature("cpp-winrt" PRIVATE PUBLIC
     LABEL "cpp/winrt base"
     PURPOSE "basic cpp/winrt language projection support"
+    AUTODETECT WIN32
     CONDITION WIN32 AND TEST_cpp_winrt
 )
 qt_feature_definition("xmlstream" "QT_NO_XMLSTREAM" NEGATE VALUE "1")
@@ -999,15 +1000,18 @@ qt_feature("permissions" PUBLIC
     PURPOSE "Provides support for requesting user permission to access restricted data or APIs"
     CONDITION APPLE OR ANDROID OR WASM
 )
+
 qt_configure_add_summary_section(NAME "Qt Core")
 qt_configure_add_summary_entry(ARGS "backtrace")
 qt_configure_add_summary_entry(ARGS "doubleconversion")
 qt_configure_add_summary_entry(ARGS "system-doubleconversion")
+qt_configure_add_summary_entry(ARGS "forkfd_pidfd" CONDITION LINUX)
 qt_configure_add_summary_entry(ARGS "glib")
 qt_configure_add_summary_entry(ARGS "icu")
 qt_configure_add_summary_entry(ARGS "system-libb2")
 qt_configure_add_summary_entry(ARGS "mimetype-database")
-qt_configure_add_summary_entry(ARGS "cpp-winrt")
+qt_configure_add_summary_entry(ARGS "permissions")
+qt_configure_add_summary_entry(ARGS "ipc_posix" CONDITION UNIX)
 qt_configure_add_summary_entry(
     TYPE "firstAvailableFeature"
     ARGS "etw lttng ctf"
@@ -1024,11 +1028,6 @@ qt_configure_add_summary_entry(
 )
 qt_configure_add_summary_entry(ARGS "pcre2")
 qt_configure_add_summary_entry(ARGS "system-pcre2")
-qt_configure_add_summary_entry(
-    ARGS "forkfd_pidfd"
-    CONDITION LINUX
-)
-qt_configure_add_summary_entry(ARGS "permissions")
 qt_configure_end_summary_section() # end of "Qt Core" section
 qt_configure_add_report_entry(
     TYPE NOTE

src/corelib/ipc/qtipccommon.h

@@ -31,8 +31,6 @@ public:
     static constexpr Type DefaultTypeForOs =
 #ifdef Q_OS_WIN
             Type::Windows
-#elif !defined(QT_POSIX_IPC)
-            Type::SystemV
 #else
             Type::PosixRealtime
 #endif

tests/auto/corelib/ipc/qnativeipckey/tst_qnativeipckey.cpp

@@ -46,8 +46,6 @@ void tst_QNativeIpcKey::defaultTypes()
 
 #ifdef Q_OS_WIN
     QCOMPARE(type, QNativeIpcKey::Type::Windows);
-#elif !defined(QT_POSIX_IPC)
-    QCOMPARE(type, QNativeIpcKey::Type::SystemV);
 #else
     QCOMPARE(type, QNativeIpcKey::Type::PosixRealtime);
 #endif