3 files changed, 21 insertions, 7 deletions
diff --git a/src/corelib/io/qsettings.cpp b/src/corelib/io/qsettings.cpp
index 8ee42e7..e6c5fb9 100644
--- a/src/corelib/io/qsettings.cpp
+++ b/src/corelib/io/qsettings.cpp
@@ -88,6 +88,12 @@
 #define CSIDL_APPDATA		0x001a	// <username>\Application Data
 #endif
 
+#ifdef Q_AUTOTEST_EXPORT
+#  define Q_AUTOTEST_EXPORT_HELPER Q_AUTOTEST_EXPORT
+#else
+#  define Q_AUTOTEST_EXPORT_HELPER static
+#endif
+
 // ************************************************************************
 // QConfFile
 
@@ -134,7 +140,7 @@ QT_BEGIN_INCLUDE_NAMESPACE
 # include <sys/mount.h>
 QT_END_INCLUDE_NAMESPACE
 
-static bool isLikelyToBeNfs(int handle)
+Q_AUTOTEST_EXPORT_HELPER bool qIsLikelyToBeNfs(int handle)
 {
     struct statfs buf;
     if (fstatfs(handle, &buf) != 0)
@@ -160,7 +166,7 @@ QT_END_INCLUDE_NAMESPACE
 #  define AUTOFSNG_SUPER_MAGIC  0x7d92b1a0
 # endif
 
-static bool isLikelyToBeNfs(int handle)
+Q_AUTOTEST_EXPORT_HELPER bool qIsLikelyToBeNfs(int handle)
 {
     struct statfs buf;
     if (fstatfs(handle, &buf) != 0)
@@ -177,7 +183,7 @@ QT_BEGIN_INCLUDE_NAMESPACE
 # include <sys/statvfs.h>
 QT_END_INCLUDE_NAMESPACE
 
-static bool isLikelyToBeNfs(int handle)
+Q_AUTOTEST_EXPORT_HELPER bool qIsLikelyToBeNfs(int handle)
 {
     struct statvfs buf;
     if (fstatvfs(handle, &buf) != 0)
@@ -189,7 +195,7 @@ static bool isLikelyToBeNfs(int handle)
 #endif
 }
 #else
-static inline bool isLikelyToBeNfs(int /* handle */)
+Q_AUTOTEST_EXPORT_HELPER inline bool qIsLikelyToBeNfs(int /* handle */)
 {
     return true;
 }
@@ -203,7 +209,7 @@ static bool unixLock(int handle, int lockType)
         now is to disable locking when we detect NFS (or AutoFS or
         CacheFS, which are probably wrapping NFS).
     */
-    if (isLikelyToBeNfs(handle))
+    if (qIsLikelyToBeNfs(handle))
         return false;
 
     struct flock fl;
diff --git a/src/corelib/tools/qpoint.cpp b/src/corelib/tools/qpoint.cpp
index 66f06e9..c297709 100644
--- a/src/corelib/tools/qpoint.cpp
+++ b/src/corelib/tools/qpoint.cpp
@@ -438,8 +438,12 @@ QDebug operator<<(QDebug d, const QPointF &p)
 /*!
     \fn bool QPointF::isNull() const
 
-    Returns true if both the x and y coordinates are set to 0.0,
+    Returns true if both the x and y coordinates are set to +0.0;
     otherwise returns false.
+
+    \note Since this function treats +0.0 and -0.0 differently, points
+    with zero-valued coordinates where either or both values have a
+    negative sign are not defined to be null points.
 */
 
 
diff --git a/src/corelib/tools/qsize.cpp b/src/corelib/tools/qsize.cpp
index 20ac344..12287ab 100644
--- a/src/corelib/tools/qsize.cpp
+++ b/src/corelib/tools/qsize.cpp
@@ -492,9 +492,13 @@ QDebug operator<<(QDebug dbg, const QSize &s) {
 /*!
     \fn bool QSizeF::isNull() const
 
-    Returns true if both the width and height is 0; otherwise returns
+    Returns true if both the width and height are +0.0; otherwise returns
     false.
 
+    \note Since this function treats +0.0 and -0.0 differently, sizes with
+    zero width and height where either or both values have a negative
+    sign are not defined to be null sizes.
+
     \sa isValid(), isEmpty()
 */