benchtests: Mark output variables as used

Prevent function calls that don't return anything from being optimized
out by the compiler by marking its input variables as used.

This prevents the sincos function call from being optimized out in the
benchmark.

1 files changed, 5 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index dd5a2b5b18..2d53b2b4ae 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2015-11-17  Siddhesh Poyarekar  <siddhesh.poyarekar@linaro.org>
+
+	* benchtests/scripts/bench.py (_print_arg_data): Mark output variables
+	as used.
+
 2015-11-16  Florian Weimer  <fweimer@redhat.com>
 
 	* math/test-signgam-finite-c99.c (_Mlong_double_): Undefine.