Fix warning in setjmp/jmpbug.c.

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.

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

1 files changed, 5 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 23fba36..d6cedab 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2014-11-26  Joseph Myers  <joseph@codesourcery.com>
+
+	* setjmp/jmpbug.c (test): Make foo volatile and cast it to
+	void.
+
 2014-11-25  Joseph Myers  <joseph@codesourcery.com>
 
 	* stdio-common/tst-printf-round.c (test_hex_in_one_mode): Make