Improve detection of monotonic timer support

Some older systems support monotonic timers, but not POSIX.1-2001. The
sysconf() function is documented to return -1 if a feature is not
supported, otherwise it returns a value that's dependent on it's
argument. For POSIX.1-2001 compliant system, the value is 200112L, but
on other systems it may just return 1, for example.

Because of this, we check for the -1 return value (feature missing),
instead of relying on a specific (positive) return value.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/corelib/kernel/qeventdispatcher_unix.cpp b/src/corelib/kernel/qeventdispatcher_unix.cpp
index 6aa3b56..1b9cb93 100644
--- a/src/corelib/kernel/qeventdispatcher_unix.cpp
+++ b/src/corelib/kernel/qeventdispatcher_unix.cpp
@@ -263,7 +263,7 @@ QTimerInfoList::QTimerInfoList()
 #  if (_POSIX_MONOTONIC_CLOCK == 0)
     // detect if the system support monotonic timers
     long x = sysconf(_SC_MONOTONIC_CLOCK);
-    useMonotonicTimers = x >= 200112L;
+    useMonotonicTimers = x != -1;
 #  endif
 
     getTime(currentTime);