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D39031.diff
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diff --git a/sys/sys/types.h b/sys/sys/types.h
--- a/sys/sys/types.h
+++ b/sys/sys/types.h
@@ -347,6 +347,18 @@
((dev_t)(_Minor & 0xff00) << 24) | (_Minor & 0xffff00ff));
}
+#if (defined(__clang__) || (defined(__GNUC__) && __GNUC__ >= 13))
+#define __enum_uint8_decl(name) enum enum_ ## name ## _uint8 : uint8_t
+#define __enum_uint8(name) enum enum_ ## name ## _uint8
+#else
+/*
+ * Note: there is no real size checking here, but the code below can be
+ * removed once we require GCC 13.
+ */
+#define __enum_uint8_decl(name) enum __attribute__((packed)) enum_ ## name ## _uint8
+#define __enum_uint8(name) enum __attribute__((packed)) enum_ ## name ## _uint8
+#endif
+
/*
* These declarations belong elsewhere, but are repeated here and in
* <stdio.h> to give broken programs a better chance of working with
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D39031: Support byte-sized enums
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