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authorLudovic Courtès <ludo@gnu.org>2011-12-14 23:02:29 +0100
committerLudovic Courtès <ludo@gnu.org>2011-12-14 23:46:22 +0100
commit7f1ea859ee33383db29e38dec5802ee0f21b09bc (patch)
treeca1cdf98963ecf6108cda6298ea8d7674283980a /lib/alignof.h
parent1002c774e0b908b50895da9a21a4bb63d18228de (diff)
downloadguile-7f1ea859ee33383db29e38dec5802ee0f21b09bc.tar.gz
Update Gnulib to v0.0-6703-g4e0358a.
Diffstat (limited to 'lib/alignof.h')
-rw-r--r--lib/alignof.h14
1 files changed, 6 insertions, 8 deletions
diff --git a/lib/alignof.h b/lib/alignof.h
index 4d03e35c9..2049142c6 100644
--- a/lib/alignof.h
+++ b/lib/alignof.h
@@ -20,8 +20,11 @@
#include <stddef.h>
-/* Determine the alignment of a structure slot (field) of a given type,
+/* alignof_slot (TYPE)
+ Determine the alignment of a structure slot (field) of a given type,
at compile time. Note that the result depends on the ABI.
+ This is the same as alignof (TYPE) and _Alignof (TYPE), defined in
+ <stdalign.h> if __alignof_is_defined is 1.
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
@@ -31,7 +34,8 @@
# define alignof_slot(type) offsetof (struct { char __slot1; type __slot2; }, __slot2)
#endif
-/* Determine the good alignment of an object of the given type at compile time.
+/* alignof_type (TYPE)
+ 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,
@@ -44,10 +48,4 @@
# define alignof_type alignof_slot
#endif
-/* 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,
- due to bugs in HP-UX 10.20 cc and AIX 3.2.5 xlc. */
-#define alignof alignof_slot
-
#endif /* _ALIGNOF_H */