Replace nosys hack with __verbose_terminate_handler.

micropython/modules/cppmem/cppmem.cpp

@@ -4,6 +4,17 @@
 #include <cstring>
 #include <cstdio>
 
+#ifdef PIMORONI_VERBOSE_TERMINATE_HANDLER
+namespace __gnu_cxx
+{
+    void __verbose_terminate_handler()
+    {
+    for (;;)
+        ;
+    }
+}
+#endif
+
 enum allocator_mode {
     FIXED_HEAP = 0,
     MICROPYTHON

micropython/modules/cppmem/micropython.cmake

@@ -11,6 +11,7 @@ target_include_directories(usermod_cppmem INTERFACE
 
 target_compile_definitions(usermod_cppmem INTERFACE
     MODULE_CPPMEM_ENABLED=1
+    PIMORONI_VERBOSE_TERMINATE_HANDLER=1
 )
 
 target_link_libraries(usermod INTERFACE usermod_cppmem)

micropython/modules/micropython-disable-exceptions.cmake

@@ -6,4 +6,3 @@ target_compile_options(usermod INTERFACE $<$<COMPILE_LANGUAGE:CXX>:
     -fno-rtti
     -fno-use-cxa-atexit
 >)
-target_link_options(usermod INTERFACE -specs=nano.specs)