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.

diff --git a/ChangeLog b/ChangeLog
index 23fba3607d531d619939218aafeaa55baa88633d..d6cedab7eb6d07a1a05776d539f5e7ee63382363 100644 (file)
--- 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

diff --git a/setjmp/jmpbug.c b/setjmp/jmpbug.c
index 125977b2f719dbeb5743c5133d144802d4b35cb7..8594c5a8a782b2182d0e8e39a58c4a2f08ebeec8 100644 (file)
--- 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);
 }