diff mbox

Fix warning in setjmp/jmpbug.c

Message ID alpine.DEB.2.10.1411260037310.17237@digraph.polyomino.org.uk
State New
Headers show

Commit Message

Joseph Myers Nov. 26, 2014, 12:37 a.m. UTC 
This patch fixes a "set but not used" warning in setjmp/jmpbug.c.  A
variable is used only to store the result of alloca.  A cast to void
is added to avoid the warning, and the variable is made volatile to
ensure the call to alloca isn't optimized away for being unused.

Tested for x86_64.

2014-11-26  Joseph Myers  <joseph@codesourcery.com>

	* setjmp/jmpbug.c (test): Make foo volatile and cast it to
	void.

Comments

Ondřej Bílka Nov. 26, 2014, 12:41 a.m. UTC | #1 
On Wed, Nov 26, 2014 at 12:37:49AM +0000, Joseph Myers wrote:
> This patch fixes a "set but not used" warning in setjmp/jmpbug.c.  A
> variable is used only to store the result of alloca.  A cast to void
> is added to avoid the warning, and the variable is made volatile to
> ensure the call to alloca isn't optimized away for being unused.
> 
> Tested for x86_64.
> 
looks ok.
diff mbox

Patch

diff --git a/setjmp/jmpbug.c b/setjmp/jmpbug.c
index 125977b..8594c5a 100644
--- a/setjmp/jmpbug.c
+++ b/setjmp/jmpbug.c
@@ -14,7 +14,7 @@  static void
 test (int x)
 {
   jmp_buf buf;
-  char *foo;
+  char *volatile foo;
   int arr[100];
 
   arr[77] = x;
@@ -25,6 +25,7 @@  test (int x)
     }
 
   foo = (char *) alloca (128);
+  (void) foo;
   sub5 (buf);
 }