fix clang++ error messages
fix clang++ error messages

--HG--
extra : convert_revision : 85709943a60ee73faf277f702b859dcb13923949

sonny-tarbouriech/ompl,utiasASRL/batch-informed-trees,utiasASRL/batch-informed-trees,jvgomez/ompl,davetcoleman/ompl,davetcoleman/ompl,jvgomez/ompl,utiasASRL/batch-informed-trees,jvgomez/ompl,jvgomez/ompl,davetcoleman/ompl,utiasASRL/batch-informed-trees,florianhauer/ompl,florianhauer/ompl,davetcoleman/ompl,sonny-tarbouriech/ompl,sonny-tarbouriech/ompl,sonny-tarbouriech/ompl,utiasASRL/batch-informed-trees,utiasASRL/batch-informed-trees,florianhauer/ompl,jvgomez/ompl,florianhauer/ompl,florianhauer/ompl,sonny-tarbouriech/ompl,jvgomez/ompl,sonny-tarbouriech/ompl,davetcoleman/ompl,davetcoleman/ompl,florianhauer/ompl