py/mpconfig: Enable the sys module at all feature levels by default.

This is a pretty fundamental module, and even minimal ports like unix and
zephyr minimal have it enabled.  So, enabled it by default at the lowest
feature level.

Most things in the `sys` module are configurable, and off by default, so it
shouldn't add too much to ports that don't already have it enabled (which
is just the minimal port).

Also note that `sys` is still disabled on the bare-arm port, to keep that
ultra minimal.  It means we now have bare-arm without `sys` and the minimal
port with `sys`.  That will allow different code size comparisons if/when
new `sys` features are added.

Signed-off-by: Damien George <damien@micropython.org>

examples/embedding/mpconfigport.h

@@ -13,3 +13,4 @@
 #define MICROPY_ENABLE_COMPILER                 (1)
 #define MICROPY_ENABLE_GC                       (1)
 #define MICROPY_PY_GC                           (1)
+#define MICROPY_PY_SYS                          (0)

ports/bare-arm/mpconfigport.h

@@ -37,6 +37,9 @@
 // Python internal features
 #define MICROPY_ERROR_REPORTING                 (MICROPY_ERROR_REPORTING_NONE)
 
+// Fine control over Python builtins, classes, modules, etc.
+#define MICROPY_PY_SYS                          (0)
+
 // Type definitions for the specific machine
 
 typedef int32_t mp_int_t; // must be pointer size

ports/minimal/mpconfigport.h

@@ -21,6 +21,12 @@
 // Use the minimum headroom in the chunk allocator for parse nodes.
 #define MICROPY_ALLOC_PARSE_CHUNK_INIT    (16)
 
+// Disable all optional sys module features.
+#define MICROPY_PY_SYS_MODULES            (0)
+#define MICROPY_PY_SYS_EXIT               (0)
+#define MICROPY_PY_SYS_PATH               (0)
+#define MICROPY_PY_SYS_ARGV               (0)
+
 // type definitions for the specific machine
 
 typedef intptr_t mp_int_t; // must be pointer size

ports/nrf/mpconfigport.h

@@ -289,7 +289,6 @@
 #define MICROPY_PY_GENERATOR_PEND_THROW       (1)
 #define MICROPY_PY_MATH                       (1)
 #define MICROPY_PY_STRUCT                     (1)
-#define MICROPY_PY_SYS                        (1)
 #define MICROPY_PY_SYS_PATH_ARGV_DEFAULTS     (1)
 #endif
 

ports/powerpc/mpconfigport.h

@@ -81,7 +81,6 @@
 #define MICROPY_PY_CMATH            (0)
 #define MICROPY_PY_IO               (0)
 #define MICROPY_PY_STRUCT           (1)
-#define MICROPY_PY_SYS              (1)
 #define MICROPY_MODULE_FROZEN_MPY   (1)
 #define MICROPY_CPYTHON_COMPAT      (0)
 #define MICROPY_LONGINT_IMPL        (MICROPY_LONGINT_IMPL_MPZ)

ports/unix/variants/minimal/mpconfigvariant.h

@@ -61,6 +61,5 @@
 #define MICROPY_PY_BUILTINS_RANGE_ATTRS (1)
 #define MICROPY_PY_GENERATOR_PEND_THROW (1)
 
-// Enable just the sys and os built-in modules.
-#define MICROPY_PY_SYS (1)
+// Add just the os built-in module.
 #define MICROPY_PY_OS (1)

ports/zephyr/mpconfigport_minimal.h

@@ -59,7 +59,6 @@
 #define MICROPY_PY_BUILTINS_STR_OP_MODULO (1)
 #define MICROPY_PY_BUILTINS_BYTEARRAY (1)
 #define MICROPY_PY_BUILTINS_DICT_FROMKEYS (1)
-#define MICROPY_PY_SYS              (1)
 
 #ifdef CONFIG_BOARD
 #define MICROPY_HW_BOARD_NAME "zephyr-" CONFIG_BOARD

py/mpconfig.h

@@ -1610,7 +1610,7 @@ typedef time_t mp_timestamp_t;
 
 // Whether to provide "sys" module
 #ifndef MICROPY_PY_SYS
-#define MICROPY_PY_SYS (MICROPY_CONFIG_ROM_LEVEL_AT_LEAST_CORE_FEATURES)
+#define MICROPY_PY_SYS (1)
 #endif
 
 // Whether to initialise "sys.path" and "sys.argv" to their defaults in mp_init()