File superlu-4.3-dont-opt-away.diff of Package superlu

diff -aruN SuperLU_4.3.orig/INSTALL/timertst.c SuperLU_4.3/INSTALL/timertst.c
--- SuperLU_4.3.orig/INSTALL/timertst.c	2011-10-27 21:49:47.000000000 +0200
+++ SuperLU_4.3/INSTALL/timertst.c	2012-12-20 21:55:13.954437737 +0100
@@ -6,6 +6,8 @@
     return;
 }
 
+volatile double _dummy;
+
 int main()
 {
     /* Parameters */    
@@ -32,6 +34,7 @@
       for (j = 0; j < iters; ++j) {
 	for (i = 0; i < NMAX; ++i) y[i] += alpha * x[i];
 	alpha = -alpha;
+	_dummy = y[j%NMAX];
       }
       t2 = SuperLU_timer_();
       tnotim = t2 - t1;