[PATCH v2] ARC/signal: shield sa_restorer from compiler toggle side-effects

when building uClibc with -O0 (DODEBUG build) the default sigrestorer
had some extra glue code generated for stack manipulation which was
messing up resume from signal path.

So annotate the function with -Os so that gcc would only generate the
bare min 2 instruction TRAP sequence

Reported-and-Debugged-by: Alexey Brodkin <[email protected]>
Signed-off-by: Vineet Gupta <[email protected]>
---
 libc/sysdeps/linux/arc/sigaction.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libc/sysdeps/linux/arc/sigaction.c b/libc/sysdeps/linux/arc/sigaction.c
index 4a4c9e2d0821..67ca38acacca 100644
--- a/libc/sysdeps/linux/arc/sigaction.c
+++ b/libc/sysdeps/linux/arc/sigaction.c
@@ -13,7 +13,8 @@
 /*
  * Default sigretrun stub if user doesn't specify SA_RESTORER
  */
-static void __default_rt_sa_restorer(void)
+static void attribute_optimize("Os") __attribute_noinline__
+__default_rt_sa_restorer(void)
 {
 	INTERNAL_SYSCALL_NCS(__NR_rt_sigreturn, , 0);
 }
-- 
1.9.1