make tests work with clang and gcc5

dune/common/quadmath.hh

@@ -233,7 +233,7 @@ namespace Dune
     DUNE_UNARY_FUNC(log10, log10q);
     DUNE_UNARY_FUNC(log1p, log1pq);
     DUNE_UNARY_FUNC(log2, log2q);
-    DUNE_UNARY_FUNC(logb, logbq);
+    // DUNE_UNARY_FUNC(logb, logbq); // not available in gcc5
     DUNE_CUSTOM_UNARY_FUNC(long int, lrint, lrintq);
     DUNE_CUSTOM_UNARY_FUNC(long int, lround, lroundq);
     DUNE_UNARY_FUNC(nearbyint, nearbyintq);

dune/common/test/fvectortest.cc

@@ -545,7 +545,9 @@ int main()
     FieldVectorTest<float, 3>();
     FieldVectorTest<double, 3>();
     FieldVectorTest<long double, 3>();
+#if HAVE_QUADMATH
     FieldVectorTest<Dune::Float128, 3>();
+#endif
 #if HAVE_GMP
     // we skip the complex test and the int test, as these will be very hard to implement with GMPField
     typedef Dune::GMPField<128u> ft;