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-rw-r--r--include/ansidecl.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/ansidecl.h b/include/ansidecl.h
index a1a765d63f3..16adc47a1bf 100644
--- a/include/ansidecl.h
+++ b/include/ansidecl.h
@@ -361,6 +361,12 @@ So instead we use the macro below and test it against specific values. */
# endif /* GNUC >= 3.0 */
#endif /* ATTRIBUTE_ALIGNED_ALIGNOF */
+/* Useful for structures whose layout must much some binary specification
+ regardless of the alignment and padding qualities of the compiler. */
+#ifndef ATTRIBUTE_PACKED
+# define ATTRIBUTE_PACKED __attribute__ ((packed))
+#endif
+
/* We use __extension__ in some places to suppress -pedantic warnings
about GCC extensions. This feature didn't work properly before
gcc 2.8. */
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