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[PATCH 2/3 v2] sys/cdefs.h: export __attribute_alloc_size__


Since we want to use this in installed headers, move it to the installed
sys/cdefs.h.  This requires a slight tweaking of the name (add trailing
underscores).

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

2012-12-30  Mike Frysinger  <vapier@gentoo.org>

	* include/programs/xmalloc.h: Change __attribute_alloc_size to
	__attribute_alloc_size__.
	* include/sys/cdefs.h (__attribute_alloc_size): Macro removed.
	* misc/sys/cdefs.h (__attribute_alloc_size__): New macro.
---
v2
	- change macro style to avoid __VA_ARGS__

 include/programs/xmalloc.h | 6 +++---
 include/sys/cdefs.h        | 2 --
 misc/sys/cdefs.h           | 9 +++++++++
 3 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/include/programs/xmalloc.h b/include/programs/xmalloc.h
index 550542a..d5f2954 100644
--- a/include/programs/xmalloc.h
+++ b/include/programs/xmalloc.h
@@ -24,11 +24,11 @@
 
 /* Prototypes for a few program-wide used functions.  */
 extern void *xmalloc (size_t n)
-  __attribute_malloc__ __attribute_alloc_size (1);
+  __attribute_malloc__ __attribute_alloc_size__ ((1));
 extern void *xcalloc (size_t n, size_t s)
-  __attribute_malloc__ __attribute_alloc_size (1, 2);
+  __attribute_malloc__ __attribute_alloc_size__ ((1, 2));
 extern void *xrealloc (void *o, size_t n)
-  __attribute_malloc__ __attribute_alloc_size (2);
+  __attribute_malloc__ __attribute_alloc_size__ ((2));
 extern char *xstrdup (const char *) __attribute_malloc__;
 
 #endif /* xmalloc.h */
diff --git a/include/sys/cdefs.h b/include/sys/cdefs.h
index 71baa1a..524fe57 100644
--- a/include/sys/cdefs.h
+++ b/include/sys/cdefs.h
@@ -13,8 +13,6 @@ extern void __chk_fail (void) __attribute__ ((__noreturn__));
 libc_hidden_proto (__chk_fail)
 rtld_hidden_proto (__chk_fail)
 
-
-# define __attribute_alloc_size(...) __attribute__ ((alloc_size (__VA_ARGS__)))
 #endif
 
 #endif
diff --git a/misc/sys/cdefs.h b/misc/sys/cdefs.h
index 81ab318..f9e58b6 100644
--- a/misc/sys/cdefs.h
+++ b/misc/sys/cdefs.h
@@ -222,6 +222,15 @@
 # define __attribute_malloc__ /* Ignore */
 #endif
 
+/* Tell the compiler which arguments to an allocation function
+   indicate the size of the allocation.  */
+#if __GNUC_PREREQ (4, 3)
+# define __attribute_alloc_size__(params) \
+  __attribute__ ((__alloc_size__ params))
+#else
+# define __attribute_alloc_size__(params) /* Ignore.  */
+#endif
+
 /* At some point during the gcc 2.96 development the `pure' attribute
    for functions was introduced.  We don't want to use it unconditionally
    (although this would be possible) since it generates warnings.  */
-- 
1.8.0.2


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