Force callback non-trivial for IAR

Author: jeromecoutant

platform/Callback.h

@@ -30,6 +30,13 @@
 // MBED_CONF_PLATFORM_CALLBACK_NONTRIVIAL - support storing non-trivial function objects
 // MBED_CONF_PLATFORM_CALLBACK_COMPARABLE - support memcmp comparing stored objects (requires zero padding)
 
+#ifdef __ICCARM__
+/* Force platform.callback-nontrivial for IAR */
+#undef MBED_CONF_PLATFORM_CALLBACK_NONTRIVIAL
+#define MBED_CONF_PLATFORM_CALLBACK_NONTRIVIAL 1
+#endif
+
+
 namespace mbed {
 /** \addtogroup platform-public-api */
 /** @{*/

platform/mbed_lib.json

@@ -119,7 +119,7 @@
             "value": 8
         },
         "callback-nontrivial": {
-            "help": "Enables support for non-trivial callable objects in Callback. Can be disabled to save ROM if no-one is using non-trivial types. Changing this value may cause incompatibility with pre-built binaries.",
+            "help": "Enables support for non-trivial callable objects in Callback. Can be disabled to save ROM if no-one is using non-trivial types. Changing this value may cause incompatibility with pre-built binaries. Choice not available with IAR, value forced to true.",
             "value": false
         },
         "callback-comparable": {