headers: properly decorate attributes

Found by:
find -name '*.h' |xargs grep -i 'attribute.*(([a-z]'

For an example of the type of bugs this causes, try compiling this valid
C11 program (it's valid because 'noreturn' is reserved for use in the
user namespace unless you include <stdnoreturn.h>):

$ cat foo.c
#define noreturn __attribute__((noreturn))
#include <stdlib.h>
$ gcc -c -o foo.o -Wall foo.c
In file included from /usr/include/stdlib.h:11:0,
                 from foo.c:2:
foo.c:1:18: error: expected ')' before '__attribute__'
 #define noreturn __attribute__((noreturn))
                  ^
/usr/include/stdlib.h:66:28: error: expected ',' or ';' before ')' token
 _VOID _EXFUN(abort,(_VOID) _ATTRIBUTE ((noreturn)));
                            ^

* libc/machine/spu/spu_timer_internal.h: Decorate attribute names
with __, for namespace safety.
* libc/machine/xscale/machine/profile.h: Likewise.
* libc/include/stdlib.h: Likewise.
* libc/include/_ansi.h: Likewise.
* libc/include/sys/unistd.h: Likewise.
* libc/sys/linux/linuxthreads/libc-symbols.h: Likewise.
* libc/sys/linux/linuxthreads/internals.h: Likewise.
* libc/sys/linux/machine/i386/weakalias.h: Likewise.
* libc/sys/linux/machine/i386/dl-procinfo.h: Likewise.
* libc/sys/linux/machine/i386/dl-machine.h: Likewise.
* libc/sys/linux/libc-symbols.h: Likewise.
* libc/sys/linux/iconv/gconv_charset.h: Likewise.
* libc/sys/linux/include/resolv.h: Likewise.
* libc/sys/linux/sys/unistd.h: Likewise.
* libc/sys/linux/dl/atomicity.h: Likewise.
* libc/sys/linux/dl/dynamic-link.h: Likewise.
* libc/sys/linux/dl/ldsodefs.h: Likewise.

1 files changed, 3 insertions, 3 deletions

diff --git a/newlib/libc/sys/linux/dl/atomicity.h b/newlib/libc/sys/linux/dl/atomicity.h
index 3dbd00689..2ff7e5270 100644
--- a/newlib/libc/sys/linux/dl/atomicity.h
+++ b/newlib/libc/sys/linux/dl/atomicity.h
@@ -23,7 +23,7 @@
 
 
 static inline uint32_t
-__attribute__ ((unused))
+__attribute__ ((__unused__))
 exchange_and_add (volatile uint32_t *mem, uint32_t val)
 {
   register uint32_t result;
@@ -33,7 +33,7 @@ exchange_and_add (volatile uint32_t *mem, uint32_t val)
 }
 
 static inline void
-__attribute__ ((unused))
+__attribute__ ((__unused__))
 atomic_add (volatile uint32_t *mem, int val)
 {
   __asm__ __volatile__ ("lock; addl %1,%0"
@@ -41,7 +41,7 @@ atomic_add (volatile uint32_t *mem, int val)
 }
 
 static inline char
-__attribute__ ((unused))
+__attribute__ ((__unused__))
 compare_and_swap (volatile long int *p, long int oldval, long int newval)
 {
   char ret;