Make a test that only runs if benchmark was found

test/sumfact/poisson/CMakeLists.txt

@@ -119,3 +119,13 @@ dune_add_formcompiler_system_test(UFLFILE poisson_dg_3d.ufl
                                   BASENAME sumfact_poisson_dg_3d_diagonal
                                   INIFILE diagonal.mini
                                   )
+
+#======================================
+# Test autotuning with google-benchmark
+#======================================
+if(benchmark_FOUND)
+  dune_add_formcompiler_system_test(UFLFILE poisson_3d.ufl
+                                  BASENAME sumfact_poisson_3d_benchmark
+                                  INIFILE poisson_3d_benchmark.mini
+                                  )
+endif()

test/sumfact/poisson/poisson_3d.mini

@@ -16,7 +16,6 @@ extension = vtu
 
 [formcompiler]
 compare_l2errorsquared = 1e-4, 1e-8 | expand deg
-autotune_google_benchmark = 0, 1 | expand deg
 
 [formcompiler.r]
 numerical_jacobian = 1, 0 | expand num

test/sumfact/poisson/poisson_3d_benchmark.mini

+__name = sumfact_poisson_3d_benchmark_{__exec_suffix}
+__exec_suffix = {deg_suffix}_{diff_suffix}_{quadvec_suffix}_{gradvec_suffix}
+
+deg_suffix = deg{formcompiler.ufl_variants.degree}
+diff_suffix = symdiff
+quadvec_suffix = quadvec
+gradvec_suffix = autotunevec
+
+cells = 8 8 8
+extension = 1. 1. 1.
+
+[wrapper.vtkcompare]
+name = {__name}
+reference = poisson_ref
+extension = vtu
+
+[formcompiler]
+compare_l2errorsquared = 1e-4
+autotune_google_benchmark = 1
+
+[formcompiler.r]
+numerical_jacobian = 0
+sumfact = 1
+vectorization_quadloop = 1
+vectorization_strategy = autotune
+geometry_mixins = sumfact_equidistant
+
+[formcompiler.ufl_variants]
+degree = 1