message: skip validation on non-MPI builds
diff: @@ -8,11 +8,6 @@ target_link_libraries(TestUtilsCWriter adios2)
  if(ADIOS2_HAVE_MPI)
  target_link_libraries(TestUtilsCWriter MPI::MPI_C)
  -
  -# set(extra_test_args
  -# EXEC_WRAPPER
  -# ${MPIEXEC} ${MPIEXEC_NUMPROC_FLAG} ${MPIEXEC_MAX_NUMPROCS}
  -# )
  set(cmd_executor ${MPIEXEC_EXECUTABLE} ${MPIEXEC_NUMPROC_FLAG} 1)
  else()
  set(cmd_executor)
  @@ -48,6 +43,8 @@ set_property(TEST Utils.Bpls.la.Dump
  PROPERTY DEPENDS Utils.C.Writer
  )
  +if(ADIOS2_HAVE_MPI)
  +
  add_test(NAME Utils.Bpls.la.ValidateFC
  COMMAND ${CMAKE_COMMAND}
  -E env diff
  @@ -68,6 +65,8 @@ set_property(TEST Utils.Bpls.la.Validate
  PROPERTY DEPENDS Utils.Bpls.la.Dump
  )
  +endif(ADIOS2_HAVE_MPI)
  +
  # bpls2 -Al
  add_test(NAME Utils.Bpls.Al.Dump
  @@ -81,6 +80,8 @@ set_property(TEST Utils.Bpls.Al.Dump
  PROPERTY DEPENDS Utils.C.Writer
  )
  +if(ADIOS2_HAVE_MPI)
  +
  add_test(NAME Utils.Bpls.Al.Validate
  COMMAND ${CMAKE_COMMAND}
  -E compare_files
  @@ -91,6 +92,7 @@ set_property(TEST Utils.Bpls.Al.Validate
  PROPERTY DEPENDS Utils.Bpls.Al.Dump
  )
  +endif(ADIOS2_HAVE_MPI)
  # bpls2 -ldD
  add_test(NAME Utils.Bpls.ldDav.Dump
  @@ -104,6 +106,8 @@ set_property(TEST Utils.Bpls.ldDav.Dump
  PROPERTY DEPENDS Utils.C.Writer
  )
  +if(ADIOS2_HAVE_MPI)
  +
  add_test(NAME Utils.Bpls.ldDav.Validate
  COMMAND ${CMAKE_COMMAND}
  -E compare_files
  @@ -115,6 +119,7 @@ set_property(TEST Utils.Bpls.ldDav.Validate
  )
  +endif(ADIOS2_HAVE_MPI)
  # bpls2 -ld varI16 -n 10
  