How can I get this cool mbed library heap function to work? Makefile: I defined MBED_HEAP_STATS_ENABLED macro. main() { ... char* buf; buf = (char*)malloc( 1000 ); printf("\n buf = %x", buf ); print_heap_stats(); } void print_heap_stats( void ) { // Log heap stats: mbed_stats_heap_t mbed_stats_heap; mbed_stats_heap_get( &mbed_stats_heap ); printf("\n%s...\n %d current_size", __FUNCTION__, mbed_stats_heap.current_size ); printf("\n %d max_size", mbed_stats_heap.max_size ); printf("\n %d total_size", mbed_stats_heap.total_size ); printf("\n %d alloc_cnt", mbed_stats_heap.alloc_cnt ); printf("\n %d alloc_fail_cnt", mbed_stats_heap.alloc_fail_cnt ); } OUTPUT................ buf = 20006dd0 print_heap_stats... 0 current_size 0 max_size 0 total_size 0 alloc_cnt 0 alloc_fail_cnt