Remove preprocessor conditionals for chrono include

__has_include(<chrono>) is always true, because C++11 chrono include
is required since 6.0.

Pick-to: 6.4 6.3 6.2
Change-Id: I50cb92571bf4f1f86e2f3f2b5f486dd3c3f30f4a
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

5 files changed, 7 insertions, 29 deletions

diff --git a/src/corelib/io/qlockfile.h b/src/corelib/io/qlockfile.h
index bc704ea28f..b63194dcd3 100644
--- a/src/corelib/io/qlockfile.h
+++ b/src/corelib/io/qlockfile.h
@@ -7,9 +7,7 @@
 #include <QtCore/qstring.h>
 #include <QtCore/qscopedpointer.h>
 
-#if __has_include(<chrono>)
-#    include <chrono>
-#endif
+#include <chrono>
 
 QT_BEGIN_NAMESPACE
 
@@ -30,7 +28,6 @@ public:
     void setStaleLockTime(int);
     int staleLockTime() const;
 
-#if __has_include(<chrono>)
     bool tryLock(std::chrono::milliseconds timeout) { return tryLock(int(timeout.count())); }
 
     void setStaleLockTime(std::chrono::milliseconds value) { setStaleLockTime(int(value.count())); }
@@ -39,7 +36,6 @@ public:
     {
         return std::chrono::milliseconds(staleLockTime());
     }
-#endif
 
     bool isLocked() const;
     bool getLockInfo(qint64 *pid, QString *hostname, QString *appname) const;
diff --git a/src/corelib/kernel/qdeadlinetimer.h b/src/corelib/kernel/qdeadlinetimer.h
index 2220f5dcef..980a2866e0 100644
--- a/src/corelib/kernel/qdeadlinetimer.h
+++ b/src/corelib/kernel/qdeadlinetimer.h
@@ -16,9 +16,7 @@
 
 #include <limits>
 
-#if __has_include(<chrono>)
-#  include <chrono>
-#endif
+#include <chrono>
 
 QT_BEGIN_NAMESPACE
 
@@ -84,7 +82,6 @@ public:
     QDeadlineTimer &operator-=(qint64 msecs)
     { *this = *this + (-msecs); return *this; }
 
-#if __has_include(<chrono>) || defined(Q_CLANG_QDOC)
     template <class Clock, class Duration>
     QDeadlineTimer(std::chrono::time_point<Clock, Duration> deadline_,
                    Qt::TimerType type_ = Qt::CoarseTimer) : t2(0)
@@ -142,7 +139,6 @@ public:
     template <class Rep, class Period>
     friend QDeadlineTimer operator+=(QDeadlineTimer &dt, std::chrono::duration<Rep, Period> value)
     { return dt = dt + value; }
-#endif
 
 private:
     qint64 t1;
@@ -156,7 +152,7 @@ public:
     QPair<qint64, unsigned> _q_data() const { return qMakePair(t1, t2); }
 };
 
-#if __has_include(<chrono>) && (defined(Q_OS_DARWIN) || defined(Q_OS_LINUX) || (defined(Q_CC_MSVC) && Q_CC_MSVC >= 1900))
+#if defined(Q_OS_DARWIN) || defined(Q_OS_LINUX) || (defined(Q_CC_MSVC) && Q_CC_MSVC >= 1900)
 // We know for these OS/compilers that the std::chrono::steady_clock uses the same
 // reference time as QDeadlineTimer
 
diff --git a/src/corelib/kernel/qobject.h b/src/corelib/kernel/qobject.h
index 7fa2790208..358f151495 100644
--- a/src/corelib/kernel/qobject.h
+++ b/src/corelib/kernel/qobject.h
@@ -20,9 +20,7 @@
 #include <QtCore/qobject_impl.h>
 #include <QtCore/qbindingstorage.h>
 
-#if __has_include(<chrono>)
-#  include <chrono>
-#endif
+#include <chrono>
 
 QT_BEGIN_NAMESPACE
 
@@ -128,13 +126,11 @@ public:
     void moveToThread(QThread *thread);
 
     int startTimer(int interval, Qt::TimerType timerType = Qt::CoarseTimer);
-#if __has_include(<chrono>)
     Q_ALWAYS_INLINE
     int startTimer(std::chrono::milliseconds time, Qt::TimerType timerType = Qt::CoarseTimer)
     {
         return startTimer(int(time.count()), timerType);
     }
-#endif
     void killTimer(int id);
 
     template<typename T>
diff --git a/src/corelib/kernel/qtimer.h b/src/corelib/kernel/qtimer.h
index ca8a81c889..00c06186c3 100644
--- a/src/corelib/kernel/qtimer.h
+++ b/src/corelib/kernel/qtimer.h
@@ -11,9 +11,7 @@
 #include <QtCore/qbasictimer.h> // conceptual inheritance
 #include <QtCore/qobject.h>
 
-#if __has_include(<chrono>)
-#  include <chrono>
-#endif
+#include <chrono>
 
 QT_BEGIN_NAMESPACE
 
@@ -145,7 +143,6 @@ Q_SIGNALS:
     void timeout(QPrivateSignal);
 
 public:
-#if __has_include(<chrono>) || defined(Q_QDOC)
     void setInterval(std::chrono::milliseconds value)
     {
         setInterval(int(value.count()));
@@ -175,7 +172,6 @@ public:
     {
         start(int(value.count()));
     }
-#endif
 
 protected:
     void timerEvent(QTimerEvent *) override;
@@ -192,7 +188,6 @@ private:
     static void singleShotImpl(int msec, Qt::TimerType timerType,
                                const QObject *receiver, QtPrivate::QSlotObjectBase *slotObj);
 
-#if __has_include(<chrono>)
     static Qt::TimerType defaultTypeFor(std::chrono::milliseconds interval)
     { return defaultTypeFor(int(interval.count())); }
 
@@ -202,7 +197,6 @@ private:
         singleShotImpl(int(interval.count()),
                        timerType, receiver, slotObj);
     }
-#endif
 };
 
 QT_END_NAMESPACE
diff --git a/src/corelib/thread/qmutex.h b/src/corelib/thread/qmutex.h
index 036fde729b..ce7b5275ac 100644
--- a/src/corelib/thread/qmutex.h
+++ b/src/corelib/thread/qmutex.h
@@ -9,10 +9,8 @@
 #include <QtCore/qtsan_impl.h>
 #include <new>
 
-#if __has_include(<chrono>)
-#  include <chrono>
-#  include <limits>
-#endif
+#include <chrono>
+#include <limits>
 
 class tst_QMutex;
 
@@ -31,7 +29,6 @@ class QMutex;
 class QRecursiveMutex;
 class QMutexPrivate;
 
-#if __has_include(<chrono>)
 namespace QtPrivate
 {
     template<class Rep, class Period>
@@ -57,7 +54,6 @@ namespace QtPrivate
         return ms < maxInt ? int(ms) : maxInt;
     }
 }
-#endif
 
 class Q_CORE_EXPORT QBasicMutex
 {