Don't run allocate_as_barrier_proc test if < 7.x

 - closes #415
 - Still broken for GFortran < 7.x

Author: zbeekman

CMakeLists.txt

@@ -646,7 +646,12 @@ if(opencoarrays_aware_compiler)
   add_caf_test(register_vector 2 register_vector)
   add_caf_test(register_alloc_vector 2 register_alloc_vector)
   add_caf_test(allocate_as_barrier 2 allocate_as_barrier)
-  add_caf_test(allocate_as_barrier_proc 8 allocate_as_barrier_proc)
+  if(gfortran_compiler AND (NOT CMAKE_Fortran_COMPILER_VERSION VERSION_LESS 7.0.0) OR (CAF_RUN_DEVELOPER_TESTS OR $ENV{OPENCOARRAYS_DEVELOPER}))
+    if( CMAKE_Fortran_COMPILER_VERSION VERSION_LESS 7.0.0 )
+      message( AUTHOR_WARNING "Developer tests requested and GFortran < 7: test allocate_as_barrier_proc may fail" )
+    endif()
+    add_caf_test(allocate_as_barrier_proc 8 allocate_as_barrier_proc)
+  endif()
   if (gfortran_compiler AND (NOT CMAKE_Fortran_COMPILER_VERSION VERSION_LESS 7.0.0) OR (CAF_RUN_DEVELOPER_TESTS OR $ENV{OPENCOARRAYS_DEVELOPER}))
     message( STATUS "Allocatable components of coarray derived types only supported in GFortran >= 7 with OpenCoarrays > 1.8.4" )
     message( STATUS "(but full support not anticipated until OpenCoarrays 2.0 release)" )