[Bug fortran/69090] Allocatable arrays mishandled in 'omp declare target'

[iverbin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69090

iverbin at gcc dot gnu.org changed:

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                 CC|                            |iverbin at gcc dot gnu.org

--- Comment #4 from iverbin at gcc dot gnu.org ---
(In reply to Alexander Monakov from comment #0)
> Compiling and running the following testcase with non-shared-memory
> accelerator segfaults in the target region, because only pointed-to data of
> the allocatable array is copied, but not the array structure (.data, .offset
> fields) itself.  From my reading of the OpenMP spec, allocatable arrays are
> not explicitely allowed in the 'declare target' directive, so the code is
> ill-formed. However, no diagnostic is issued, and generally I don't know
> what GCC intends to do here.

Do you mean *global* allocatable arrays, or locals fail too?
We discussed it a bit here: https://gcc.gnu.org/ml/gcc/2015-03/msg00238.html
There is also a discussion in OpenMP ML about clarifying the spec; and as per
my understanding global allocatable arrays are not allowed by OpenMP 4.5, so it
would be nice to have a diagnostic instead of segfault.