X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;ds=sidebyside;f=lib%2Falignof.h;h=9b8e00dbcde44e76a16886e927b119d924bc5759;hb=b344de996cd51f8a2f2558a3172016b64d99c622;hp=b09d0078ea09ad800e6b092c923578f02c2fb3e3;hpb=757fcfd1ef1892f1472c0712acdf8a2d4ec774da;p=gnulib.git

diff --git a/lib/alignof.h b/lib/alignof.h
index b09d0078e..9b8e00dbc 100644
--- a/lib/alignof.h
+++ b/lib/alignof.h
@@ -1,5 +1,5 @@
 /* Determine alignment of types.
-   Copyright (C) 2003-2004, 2006, 2009 Free Software Foundation, Inc.
+   Copyright (C) 2003-2004, 2006, 2009-2011 Free Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -21,7 +21,9 @@
 #include <stddef.h>
 
 /* Determine the alignment of a structure slot (field) of a given type,
-   at compile time.  Note that the result depends on the ABI.  */
+   at compile time.  Note that the result depends on the ABI.
+   Note: The result cannot be used as a value for an 'enum' constant,
+   due to bugs in HP-UX 10.20 cc and AIX 3.2.5 xlc.  */
 #if defined __cplusplus
   template <class type> struct alignof_helper { char __slot1; type __slot2; };
 # define alignof_slot(type) offsetof (alignof_helper<type>, __slot2)
@@ -29,11 +31,13 @@
 # define alignof_slot(type) offsetof (struct { char __slot1; type __slot2; }, __slot2)
 #endif
 
-/* Determine the good alignment of a object of the given type at compile time.
+/* Determine the good alignment of an object of the given type at compile time.
    Note that this is not necessarily the same as alignof_slot(type).
    For example, with GNU C on x86 platforms: alignof_type(double) = 8, but
    - when -malign-double is not specified:  alignof_slot(double) = 4,
-   - when -malign-double is specified:      alignof_slot(double) = 8.  */
+   - when -malign-double is specified:      alignof_slot(double) = 8.
+   Note: The result cannot be used as a value for an 'enum' constant,
+   due to bugs in HP-UX 10.20 cc and AIX 3.2.5 xlc.  */
 #if defined __GNUC__
 # define alignof_type __alignof__
 #else
@@ -42,7 +46,8 @@
 
 /* alignof is an alias for alignof_slot semantics, since that's what most
    callers need.
-   Note: The result cannot be used as a value for an 'enum' constant,  */
+   Note: The result cannot be used as a value for an 'enum' constant,
+   due to bugs in HP-UX 10.20 cc and AIX 3.2.5 xlc.  */
 #define alignof alignof_slot
 
 #endif /* _ALIGNOF_H */