[profiler] disambiguate outputTimings call, change test accordingly

dune/stuff/common/profiler.hh

@@ -123,7 +123,7 @@ public:
   void outputMap(const InfoContainerMap& run_infos_map, const double scale_factor = 1.0) const;
 
   //! file-output the named sections only
-  void outputTimings(const std::string filename = "timings") const;
+  void outputTimings(const std::string filename) const;
   void outputTimings(std::ostream& out = std::cout) const;
   void outputTimingsAll(std::ostream& out = std::cout) const;
   /** call this with correct numRuns <b> before </b> starting any profiling

dune/stuff/test/common_math.cc

@@ -107,7 +107,7 @@ TYPED_TEST(MinMaxAvgTest, All)
   EXPECT_TRUE(Dune::FloatCmp::eq(mma.average(), TypeParam(0.0)));
   mma(-4);
   mmCheck<MinMaxAvg<TypeParam>, TypeParam>(mma);
-  mmb = mma;
+  auto mmb = mma;
   mmCheck<MinMaxAvg<TypeParam>, TypeParam>(mmb);
 }
 

dune/stuff/test/common_profiler.cc

@@ -55,7 +55,8 @@ TEST(ProfilerTest, OutputConstness)
   Profiler::InfoContainerMap info_map;
   prof.output(infos);
   prof.outputAveraged(0, 0);
-  prof.outputTimings();
+  prof.outputTimings("timings");
+  prof.outputTimings(DSC::dev_null);
   prof.outputMap(info_map);
 }