Fix compiling with older Intel compilers

diff --git a/include/deal.II/fe/fe_system.h b/include/deal.II/fe/fe_system.h
index e6e3fca1a12d6a2dbc2d5767fa081e2ecb16ae74..68e37c75147bf1fdab32b7560d01424a0cfffe7b 100644 (file)
--- a/include/deal.II/fe/fe_system.h
+++ b/include/deal.II/fe/fe_system.h
@@ -475,7 +475,11 @@ public:
    * In other words, if no multiplicity for an element is explicitly specified
    * via the exponentiation operation, then it is assumed to be one (as one
    * would have expected).
+   *
+   * @warning This feature is not available for Intel compilers
+   * prior to version 19.0
    */
+#  if !defined(__INTEL_COMPILER) || __INTEL_COMPILER >= 1900
   template <
     class... FEPairs,
     typename = typename enable_if_all<
@@ -493,11 +497,15 @@ public:
    *   FiniteElementType1<dim,spacedim> fe_2;
    *   FESystem<dim,spacedim> fe_system = { fe_1^dim, fe_2^1 };
    * @endcode
+   *
+   * @warning This feature is not available for Intel compilers
+   * prior to version 19.0
    */
   FESystem(
     const std::initializer_list<
       std::pair<std::unique_ptr<FiniteElement<dim, spacedim>>, unsigned int>>
       &fe_systems);
+#  endif
 
   /**
    * Copy constructor. This constructor is deleted, i.e., copying
@@ -1272,6 +1280,7 @@ namespace internal
 
 
 
+#    if !defined(__INTEL_COMPILER) || __INTEL_COMPILER >= 1900
 // We are just forwarding/delegating to the constructor taking a
 // std::initializer_list. If we decide to remove the deprecated constructors, we
 // might just use the variadic constructor with a suitable static_assert instead
@@ -1316,6 +1325,7 @@ FESystem<dim, spacedim>::FESystem(
 
   initialize(fes, multiplicities);
 }
+#    endif
 
 #  endif // DOXYGEN