Fix tst_qfloat16 runtime failure for INTEGRITY

- GHS compiler is not fully compliant with iec559. Therefore we need
to update is_iec559 checking for GHS case.

Pick-to: 6.2
Change-Id: Ia094509d26bf5f0109f2937547a056267019cffb
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Janne Koskinen <janne.p.koskinen@qt.io>

src/corelib/global/qglobal.cpp

@@ -150,7 +150,7 @@ static_assert(sizeof(wchar_t) == sizeof(char32_t) || sizeof(wchar_t) == sizeof(c
 // denormals where GHS compiler is relying hardware behavior that is not IEC
 // 559 compliant. So split the check in several subchecks.
 
-// On GHC the compiler reports std::numeric_limits<float>::is_iec559 as false.
+// On GHS the compiler reports std::numeric_limits<float>::is_iec559 as false.
 // This is all right according to our needs.
 #if !defined(Q_CC_GHS)
 static_assert(std::numeric_limits<float>::is_iec559,

tests/auto/corelib/global/qfloat16/tst_qfloat16.cpp

@@ -540,7 +540,20 @@ void tst_qfloat16::properties()
     QVERIFY(Bounds::is_signed);
     QVERIFY(!Bounds::is_integer);
     QVERIFY(!Bounds::is_exact);
+
+    // While we'd like to check for __STDC_IEC_559__, as per ISO/IEC 9899:2011
+    // Annex F (C11, normative for C++11), there are a few corner cases regarding
+    // denormals where GHS compiler is relying hardware behavior that is not IEC
+    // 559 compliant.
+
+    // On GHS the compiler reports std::numeric_limits<float>::is_iec559 as false.
+    // and the same supposed to be for qfloat16.
+#if !defined(Q_CC_GHS)
     QVERIFY(Bounds::is_iec559);
+#else
+    // Technically, presence of NaN and infinities are implied from the above check, but that checkings GHS compiler complies.
+    QVERIFY(Bounds::has_infinity && Bounds::has_quiet_NaN && Bounds::has_signaling_NaN);
+#endif // Q_CC_GHS
     QVERIFY(Bounds::is_bounded);
     QVERIFY(!Bounds::is_modulo);
     QVERIFY(!Bounds::traps);