Don't warn about functions not emitted

If a function is used by a template but this template is not
instantiated, the function will still be defined in the header
of a module but it won't be callable because it is in an anonymous
namespace and thus we get a warning.

This only happens in Clang; GCC consider functions referenced from
templates as used.

fixup! Don't warn about functions not emitted

opm/core/simulator/initState_impl.hpp

@@ -40,6 +40,8 @@ namespace Opm
     namespace
     {
 
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunneeded-internal-declaration"
         // Find the cells that are below and above a depth.
         // TODO: add 'anitialiasing', obtaining a more precise split
         //       by f. ex. subdividing cells cut by the split depths.
@@ -61,6 +63,7 @@ namespace Opm
                 }
             }
         }
+#pragma clang diagnostic pop
 
         enum WaterInit { WaterBelow, WaterAbove };
 

tests/test_velocityinterpolation.cpp

@@ -62,7 +62,8 @@ namespace
         }
     }
 
-
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunneeded-internal-declaration"
     // Compute flux corresponding to a velocity vector v = v0 + x*v1.
     void computeFluxLinear(const UnstructuredGrid& grid,
                            const std::vector<double>& v0,
@@ -81,7 +82,7 @@ namespace
             flux[face] = std::inner_product(v.begin(), v.end(), grid.face_normals + face*dim, 0.0);
         }
     }
-
+#pragma clang diagnostic pop
 
     double vectorDiff2(const std::vector<double>& v1, const std::vector<double>& v2)
     {