py: Add MICROPY_PY_BUILTINS_REVERSED, disable for minimal ports.

minimal/mpconfigport.h

@@ -23,6 +23,7 @@
 #define MICROPY_PY_BUILTINS_MEMORYVIEW (0)
 #define MICROPY_PY_BUILTINS_ENUMERATE (0)
 #define MICROPY_PY_BUILTINS_FROZENSET (0)
+#define MICROPY_PY_BUILTINS_REVERSED (0)
 #define MICROPY_PY_BUILTINS_SET     (0)
 #define MICROPY_PY_BUILTINS_SLICE   (0)
 #define MICROPY_PY_BUILTINS_PROPERTY (0)

py/modbuiltins.c

@@ -615,7 +615,9 @@ STATIC const mp_map_elem_t mp_module_builtins_globals_table[] = {
     { MP_OBJ_NEW_QSTR(MP_QSTR_property), (mp_obj_t)&mp_type_property },
 #endif
     { MP_OBJ_NEW_QSTR(MP_QSTR_range), (mp_obj_t)&mp_type_range },
+    #if MICROPY_PY_BUILTINS_REVERSED
     { MP_OBJ_NEW_QSTR(MP_QSTR_reversed), (mp_obj_t)&mp_type_reversed },
+    #endif
 #if MICROPY_PY_BUILTINS_SET
     { MP_OBJ_NEW_QSTR(MP_QSTR_set), (mp_obj_t)&mp_type_set },
 #endif

py/mpconfig.h

@@ -469,6 +469,11 @@ typedef double mp_float_t;
 #define MICROPY_PY_BUILTINS_EXECFILE (0)
 #endif
 
+// Whether to support reversed function(type)
+#ifndef MICROPY_PY_BUILTINS_REVERSED
+#define MICROPY_PY_BUILTINS_REVERSED (1)
+#endif
+
 // Whether to set __file__ for imported modules
 #ifndef MICROPY_PY___FILE__
 #define MICROPY_PY___FILE__ (1)

py/objreversed.c

@@ -30,6 +30,8 @@
 #include "py/nlr.h"
 #include "py/runtime.h"
 
+#if MICROPY_PY_BUILTINS_REVERSED
+
 typedef struct _mp_obj_reversed_t {
     mp_obj_base_t base;
     mp_obj_t seq;           // sequence object that we are reversing
@@ -75,3 +77,5 @@ const mp_obj_type_t mp_type_reversed = {
     .getiter = mp_identity,
     .iternext = reversed_iternext,
 };
+
+#endif // MICROPY_PY_BUILTINS_REVERSED

unix/mpconfigport_minimal.h

@@ -50,6 +50,7 @@
 #define MICROPY_PY_BUILTINS_COMPILE (0)
 #define MICROPY_PY_BUILTINS_ENUMERATE (0)
 #define MICROPY_PY_BUILTINS_FROZENSET (0)
+#define MICROPY_PY_BUILTINS_REVERSED (0)
 #define MICROPY_PY_BUILTINS_SET     (0)
 #define MICROPY_PY_BUILTINS_SLICE   (0)
 #define MICROPY_PY_BUILTINS_STR_UNICODE (0)