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Improve comments.
author
Bruno Haible
<bruno@clisp.org>
Sun, 31 May 2009 19:46:14 +0000
(21:46 +0200)
committer
Bruno Haible
<bruno@clisp.org>
Wed, 3 Jun 2009 08:33:59 +0000
(10:33 +0200)
ChangeLog
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lib/alignof.h
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diff --git
a/ChangeLog
b/ChangeLog
index a8367d4647cf25a581a9d0d03ff9ced1cadb00ca..54172a3942a9dbb6df2431bf1c016cdf3005b8cc 100644
(file)
--- a/
ChangeLog
+++ b/
ChangeLog
@@
-1,3
+1,9
@@
+2009-05-31 Bruno Haible <bruno@clisp.org>
+
+ * lib/alignof.h (alignof_slot, alignof_type, alignof): Document
+ restriction due to compiler bugs.
+ Reported by Eric Blake.
+
2009-05-31 Simon Josefsson <simon@josefsson.org>
Bruno Haible <bruno@clisp.org>
2009-05-31 Simon Josefsson <simon@josefsson.org>
Bruno Haible <bruno@clisp.org>
diff --git
a/lib/alignof.h
b/lib/alignof.h
index b09d0078ea09ad800e6b092c923578f02c2fb3e3..bc52cb33ffe024fcdee47e5cca408c9e19b1844b 100644
(file)
--- a/
lib/alignof.h
+++ b/
lib/alignof.h
@@
-21,7
+21,9
@@
#include <stddef.h>
/* Determine the alignment of a structure slot (field) of a given type,
#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)
#if defined __cplusplus
template <class type> struct alignof_helper { char __slot1; type __slot2; };
# define alignof_slot(type) offsetof (alignof_helper<type>, __slot2)
@@
-33,7
+35,9
@@
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,
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
#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.
/* 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 */
#define alignof alignof_slot
#endif /* _ALIGNOF_H */