[Tests] Add simple test running a TBB program if TBB was found

dune/common/test/.gitignore

@@ -72,3 +72,4 @@ testdebugallocator_fail5
 eigenvaluestest
 *.log
 *.trs
+tbbruntest

dune/common/test/Makefile.am

@@ -57,6 +57,12 @@ TESTPROGS = \
     tupleutilitytest \
     utilitytest
 
+
+# only run this test if TBB is availabe
+if TBB
+  TESTPROGS+=tbbruntest
+endif
+
 # which tests to run
 COMPILE_XFAIL=$(DUNE_COMMON_BIN)/xfail-compile-tests
 
@@ -209,6 +215,13 @@ singletontest_SOURCES = singletontest.cc
 
 utilitytest_SOURCES = utilitytest.cc
 
+if TBB
+  tbbruntest_SOURCES = tbbruntest.cc
+  tbbruntest_CPPFLAGS = $(AM_CPPFLAGS) $(TBB_CPPFLAGS)
+  tbbruntest_LDADD = $(TBB_LIBS) $(LDADD)
+  tbbruntest_LDFLAGS = $(AM_LDFLAGS) $(TBB_LDFLAGS)
+endif
+
 testdebugallocator_SOURCES = testdebugallocator.cc
 testdebugallocator_CPPFLAGS = $(AM_CPPFLAGS)
 

dune/common/test/tbbruntest.cc

+// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+// vi: set et ts=4 sw=2 sts=2:
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <tbb/tbb.h>
+#include <numeric>
+#include <iostream>
+
+#if __cplusplus < 201103L
+// provide a fallback for compilers without lambdas
+struct add
+{
+add(int* x)
+  : _x(x)
+{}
+
+int* _x;
+
+void operator()(int i) const
+{
+_x[i] = i;
+}
+};
+#endif
+
+int main()
+{
+  int x[10] = {0};
+#if __cplusplus >= 201103L
+  tbb::parallel_for(0,10,[&](int i){ x[i] = i; });
+#else
+  tbb::parallel_for(0,10,add(x));
+#endif
+  int result = std::accumulate(x,x+10,0);
+  int expected = (9*10)/2;
+  std::cout << result << " == " << expected << (result == expected ? " ok" : " ERROR") << std::endl;
+  return !(result == expected);
+}