Disable -Winvalid-offsetof in OMROptions and FEBase.cpp

See #1662 for some further details. This will not be easy to solve
becalse it is not straightforward to covert `TR::JitConfig` to a POD
so we can use `offsetof`. This will hopefully be solved via the options
framework overhaul, so fixing this warning properly is not worth the
effort at the moment. Instead we locally disable this warning around
the problematic area.

compiler/control/OMROptions.cpp

@@ -93,6 +93,16 @@ using namespace OMR;
 
 static char * EXCLUDED_METHOD_OPTIONS_PREFIX = "ifExcluded";
 
+#if defined(LINUX)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Winvalid-offsetof"
+#elif defined(OSX)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Winvalid-offsetof"
+#elif defined(AIXPPC) || defined(J9ZOS390)
+#pragma report(disable, "CCN6281")
+#endif
+
 // The following options must be placed in alphabetical order for them to work properly
 TR::OptionTable OMR::Options::_jitOptions[] = {
 
@@ -1274,7 +1284,13 @@ TR::OptionTable OMR::Options::_jitOptions[] = {
    {NULL}
 };
 
-
+#if defined(LINUX)
+#pragma GCC diagnostic pop
+#elif defined(OSX)
+#pragma clang diagnostic pop
+#elif defined(AIXPPC) || defined(J9ZOS390)
+#pragma report(enable, "CCN6281")
+#endif
 
 int64_t
 OMR::Options::getNumericValue(char * & option)
@@ -4398,6 +4414,15 @@ OMR::Options::getDefaultCountString()
    return p;
    }
 
+#if defined(LINUX)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Winvalid-offsetof"
+#elif defined(OSX)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Winvalid-offsetof"
+#elif defined(AIXPPC) || defined(J9ZOS390)
+#pragma report(disable, "CCN6281")
+#endif
 
 char *
 OMR::Options::setCount(char *option, void *base, TR::OptionTable *entry)
@@ -4439,6 +4464,13 @@ OMR::Options::setCount(char *option, void *base, TR::OptionTable *entry)
    return option;
    }
 
+#if defined(LINUX)
+#pragma GCC diagnostic pop
+#elif defined(OSX)
+#pragma clang diagnostic pop
+#elif defined(AIXPPC) || defined(J9ZOS390)
+#pragma report(enable, "CCN6281")
+#endif
 
 // -----------------------------------------------------------------------------
 

compiler/env/FEBase.cpp

@@ -101,6 +101,8 @@ char *feGetEnv(const char *s)
 #elif defined(OSX)
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Winvalid-offsetof"
+#elif defined(AIXPPC) || defined(J9ZOS390)
+#pragma report(disable, "CCN6281")
 #endif
 
 TR::OptionTable OMR::Options::_feOptions[] =
@@ -125,6 +127,8 @@ TR::OptionTable OMR::Options::_feOptions[] =
 #pragma GCC diagnostic pop
 #elif defined(OSX)
 #pragma clang diagnostic pop
+#elif defined(AIXPPC) || defined(J9ZOS390)
+#pragma report(enable, "CCN6281")
 #endif
 
 #include "control/Recompilation.hpp"