Intel 18: more constexpr problems

diff --git a/source/grid/grid_generator_pipe_junction.cc b/source/grid/grid_generator_pipe_junction.cc
index 5810221a830d0b0d744341ff0c985bffd4817404..6751127315b85f23cf41cf2a80bda4937dc1d80d 100644 (file)
--- a/source/grid/grid_generator_pipe_junction.cc
+++ b/source/grid/grid_generator_pipe_junction.cc
@@ -314,7 +314,7 @@ namespace GridGenerator
     };
 
     // Cartesian base represented by unit vectors.
-    constexpr std::array<vector3d, spacedim> directions = {
+    const std::array<vector3d, spacedim> directions = {
       {vector3d({1., 0., 0.}), vector3d({0., 1., 0.}), vector3d({0., 0., 1.})}};
 
     // The skeleton corresponds to the axis of symmetry in the center of each