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-rw-r--r--include/ruby/defines.h20
1 files changed, 20 insertions, 0 deletions
diff --git a/include/ruby/defines.h b/include/ruby/defines.h
index b84e4f5..0a192d7 100644
--- a/include/ruby/defines.h
+++ b/include/ruby/defines.h
@@ -261,6 +261,26 @@ void rb_ia64_flushrs(void);
RUBY_ALIAS_FUNCTION_TYPE(VALUE, prot, name, args)
#endif
+#ifndef UNALIGNED_WORD_ACCESS
+# if defined(__i386) || defined(__i386__) || defined(_M_IX86) || \
+ defined(__x86_64) || defined(__x86_64__) || defined(_M_AMD64) || \
+ defined(__mc68020__)
+# define UNALIGNED_WORD_ACCESS 1
+# else
+# define UNALIGNED_WORD_ACCESS 0
+# endif
+#endif
+#ifndef PACKED_STRUCT
+# define PACKED_STRUCT(x) x
+#endif
+#ifndef PACKED_STRUCT_UNALIGNED
+# if UNALIGNED_WORD_ACCESS
+# define PACKED_STRUCT_UNALIGNED(x) PACKED_STRUCT(x)
+# else
+# define PACKED_STRUCT_UNALIGNED(x) x
+# endif
+#endif
+
RUBY_SYMBOL_EXPORT_END
#if defined(__cplusplus)