Bug report: 'useGPU' argument missing from ELPA's API calls

[Cho S]

Hello,

Specifying ELPA kernel = GPU under &GLOBAL/ELPA_KERNEL causes an error at 
the beginning of scf cycle. Looking into the code, I notice that cp2k calls 
ELPA via api as follows:

elpa_solve_evp_real_2stage_double(n, neig, m_noqr, n_rows, eval_noqr, 
v_noqr, n_rows, nblk, n_cols, &
                                                             comm_row, 
comm_col, group, &
                                                             elpa_kernel, &
                                                             useQR=.FALSE.)

However, ELPA documentation suggests that a useGPU logical variable should 
be supplied in order to initiate a GPU kernel. Therefore, the call should 
be modified as follows:

elpa_solve_evp_real_2stage_double(n, neig, m_noqr, n_rows, eval_noqr, 
v_noqr, n_rows, nblk, n_cols, &
                                                             comm_row, 
comm_col, group, &
                                                             elpa_kernel, &
                                                             useQR=.FALSE., 
useGPU=gpuflag)

where gpuflag is a logical variable (.TRUE. if ELPA_KERNEL = GPU, .FALSE. 
otherwise)

Regards,
Cho 
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