6 files changed, 26 insertions, 10 deletions
diff --git a/src/corelib/global/qconfig-bootstrapped.h b/src/corelib/global/qconfig-bootstrapped.h
index 0564683f48..b8b064d43b 100644
--- a/src/corelib/global/qconfig-bootstrapped.h
+++ b/src/corelib/global/qconfig-bootstrapped.h
@@ -98,11 +98,19 @@
 #define QT_NO_QOBJECT
 #define QT_FEATURE_process -1
 #define QT_FEATURE_regularexpression -1
-#define QT_FEATURE_renameat2 -1
+#ifdef __GLIBC_PREREQ
+# define QT_FEATURE_renameat2 (__GLIBC_PREREQ(2, 28) ? 1 : -1)
+#else
+# define QT_FEATURE_renameat2 -1
+#endif
 #define QT_FEATURE_settings -1
 #define QT_FEATURE_sharedmemory -1
 #define QT_FEATURE_slog2 -1
-#define QT_FEATURE_statx -1
+#ifdef __GLIBC_PREREQ
+# define QT_FEATURE_statx (__GLIBC_PREREQ(2, 28) ? 1 : -1)
+#else
+# define QT_FEATURE_statx -1
+#endif
 #define QT_FEATURE_syslog -1
 #define QT_NO_SYSTEMLOCALE
 #define QT_FEATURE_systemsemaphore -1
diff --git a/src/corelib/global/qglobal.cpp b/src/corelib/global/qglobal.cpp
index d197688316..37cc40f577 100644
--- a/src/corelib/global/qglobal.cpp
+++ b/src/corelib/global/qglobal.cpp
@@ -2212,10 +2212,19 @@ static bool readEtcFile(QUnixOSVersion &v, const char *filename,
     return true;
 }
 
-static bool readEtcOsRelease(QUnixOSVersion &v)
+static bool readOsRelease(QUnixOSVersion &v)
 {
-    return readEtcFile(v, "/etc/os-release", QByteArrayLiteral("ID="),
-                       QByteArrayLiteral("VERSION_ID="), QByteArrayLiteral("PRETTY_NAME="));
+    QByteArray id = QByteArrayLiteral("ID=");
+    QByteArray versionId = QByteArrayLiteral("VERSION_ID=");
+    QByteArray prettyName = QByteArrayLiteral("PRETTY_NAME=");
+
+    // man os-release(5) says:
+    // The file /etc/os-release takes precedence over /usr/lib/os-release.
+    // Applications should check for the former, and exclusively use its data
+    // if it exists, and only fall back to /usr/lib/os-release if it is
+    // missing.
+    return readEtcFile(v, "/etc/os-release", id, versionId, prettyName) ||
+            readEtcFile(v, "/usr/lib/os-release", id, versionId, prettyName);
 }
 
 static bool readEtcLsbRelease(QUnixOSVersion &v)
@@ -2297,7 +2306,7 @@ static bool readEtcDebianVersion(QUnixOSVersion &v)
 
 static bool findUnixOsVersion(QUnixOSVersion &v)
 {
-    if (readEtcOsRelease(v))
+    if (readOsRelease(v))
         return true;
     if (readEtcLsbRelease(v))
         return true;
diff --git a/src/corelib/io/qfilesystemengine_unix.cpp b/src/corelib/io/qfilesystemengine_unix.cpp
index 9d20ef5088..d0cd5449f0 100644
--- a/src/corelib/io/qfilesystemengine_unix.cpp
+++ b/src/corelib/io/qfilesystemengine_unix.cpp
@@ -91,7 +91,6 @@ extern "C" NSString *NSTemporaryDirectory();
 #  include <sys/syscall.h>
 #  include <sys/sendfile.h>
 #  include <linux/fs.h>
-#  include <linux/stat.h>
 
 // in case linux/fs.h is too old and doesn't define it:
 #ifndef FICLONE
@@ -112,6 +111,7 @@ static int renameat2(int oldfd, const char *oldpath, int newfd, const char *newp
 #    endif
 
 #    if !QT_CONFIG(statx) && defined(SYS_statx)
+#      include <linux/stat.h>
 static int statx(int dirfd, const char *pathname, int flag, unsigned mask, struct statx *statxbuf)
 { return syscall(SYS_statx, dirfd, pathname, flag, mask, statxbuf); }
 #    elif !QT_CONFIG(statx) && !defined(SYS_statx)
diff --git a/src/corelib/kernel/qeventdispatcher_glib.cpp b/src/corelib/kernel/qeventdispatcher_glib.cpp
index 8cefa7a118..4c780a9294 100644
--- a/src/corelib/kernel/qeventdispatcher_glib.cpp
+++ b/src/corelib/kernel/qeventdispatcher_glib.cpp
@@ -345,7 +345,6 @@ QEventDispatcherGlibPrivate::QEventDispatcherGlibPrivate(GMainContext *context)
                                                                         sizeof(GIdleTimerSource)));
     idleTimerSource->timerSource = timerSource;
     g_source_set_can_recurse(&idleTimerSource->source, true);
-    g_source_set_priority(&idleTimerSource->source, G_PRIORITY_DEFAULT_IDLE);
     g_source_attach(&idleTimerSource->source, mainContext);
 }
 
diff --git a/src/corelib/serialization/qxmlstream_p.h b/src/corelib/serialization/qxmlstream_p.h
index 4157fbbd0e..f8b1ede943 100644
--- a/src/corelib/serialization/qxmlstream_p.h
+++ b/src/corelib/serialization/qxmlstream_p.h
@@ -1250,7 +1250,7 @@ bool QXmlStreamReaderPrivate::parse()
             state_stack[tos] = 0;
             return true;
         } else if (act > 0) {
-            if (++tos == stack_size-1)
+            if (++tos >= stack_size-1)
                 reallocateStack();
 
             Value &val = sym_stack[tos];
diff --git a/src/corelib/tools/qtimezoneprivate_mac.mm b/src/corelib/tools/qtimezoneprivate_mac.mm
index fa0dd87cfc..d3c4fbe5da 100644
--- a/src/corelib/tools/qtimezoneprivate_mac.mm
+++ b/src/corelib/tools/qtimezoneprivate_mac.mm
@@ -227,7 +227,7 @@ QTimeZonePrivate::Data QMacTimeZonePrivate::nextTransition(qint64 afterMSecsSinc
 QTimeZonePrivate::Data QMacTimeZonePrivate::previousTransition(qint64 beforeMSecsSinceEpoch) const
 {
     // The native API only lets us search forward, so we need to find an early-enough start:
-    const NSTimeInterval lowerBound = std::numeric_limits<NSTimeInterval>::min();
+    const NSTimeInterval lowerBound = std::numeric_limits<NSTimeInterval>::lowest();
     const qint64 endSecs = beforeMSecsSinceEpoch / 1000;
     const int year = 366 * 24 * 3600; // a (long) year, in seconds
     NSTimeInterval prevSecs = endSecs; // sentinel for later check