unity: add option to enable 64-bit formatting support

This option is not enabled by default because many existing tests
use integer assertions to check the pointers:

   TEST_ASSERT_EQUAL(NULL, pointer)

This causes a "cast from pointer to integer of different size"
(-Wpointer-to-int-cast) warning to be generated, as Unity converts
every argument to UNITY_UINT first, and with 64-bit support enabled,
UNITY_UINT becomes a 64-bit unsigned type.

components/unity/Kconfig

@@ -13,6 +13,14 @@ menu "Unity unit testing library"
         help
             If not set, assertions on double arguments will not be available.
 
+    config UNITY_ENABLE_64BIT
+        bool "Support for 64-bit integer types"
+        default n
+        help
+            If not set, assertions on 64-bit integer types will always fail.
+            If this feature is enabled, take care not to pass pointers (which are 32 bit)
+            to UNITY_ASSERT_EQUAL, as that will cause pointer-to-int-cast warnings.
+
     config UNITY_ENABLE_COLOR
         bool "Colorize test output"
         default n

components/unity/include/unity_config.h

@@ -21,13 +21,16 @@
 #define UNITY_EXCLUDE_DOUBLE
 #endif //CONFIG_UNITY_ENABLE_DOUBLE
 
+#ifdef CONFIG_UNITY_ENABLE_64BIT
+#define UNITY_SUPPORT_64
+#endif
+
 #ifdef CONFIG_UNITY_ENABLE_COLOR
 #define UNITY_OUTPUT_COLOR
 #endif
 
 #define UNITY_EXCLUDE_TIME_H
 
-
 void unity_flush(void);
 void unity_putc(int c);
 void unity_gets(char* dst, size_t len);