Not respecting `KokkosKernels_ENABLE_COMPONENT_{whatever}=OFF`

[cwpearson]

Configure Kokkos Kernels:

cmake -S kokkos-kernels -B build-kokkos-kernels \
  -DKokkos_ROOT=...

See all components are enabled

Kokkos Kernels components
   COMMON:    ON
   BATCHED:   ON
   BLAS:      ON
   LAPACK:    ON
   GRAPH:     ON
   SPARSE:    ON
   ODE:       ON

Configure again with a component disabled:

cmake -S kokkos-kernels -B build-kokkos-kernels \
  -DKokkos_ROOT=...
  -DKokkosKernels_ENABLE_COMPONENT_BATCHED=OFF

See all components are still enabled:

Kokkos Kernels components
   COMMON:    ON
   BATCHED:   ON
   BLAS:      ON
   LAPACK:    ON
   GRAPH:     ON
   SPARSE:    ON
   ODE:       ON

At best this is surprising behavior.

[lucbv]

Fair enough, I will investigate this... although I thinking about it before looking at the code, my guess is that we need batched for other components so we don't fail at build time but maybe we should fail at configure time with a message explaining why the failure occured...