https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102619
Mikael Morin <mikael at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |mikael at gcc dot gnu.org
--- Comment #8 from Mikael Morin <mikael at gcc dot gnu.org> ---
The reason why the variable is not represented with an array descriptor is the
interface mapping mechanism to evaluate dummy array bounds.
gfc_add_interface_mapping replaces the normal variable decl with a
descriptorless (GFC_ARRAY_TYPE_P == 1) array. The rank for those is
GFC_TYPE_ARRAY_RANK, which is #defined to (TYPE_LANG_SPECIFIC(node)->rank).
And lang_type declares the rank field with:
int rank, corank;
so compile-time only rank.
gfc_set_interface_mapping_bounds uses a loop bounded by GFC_TYPE_ARRAY_RANK, so
it does nothing if the rank is -1 as with assumed rank.
So we expect a regular array descriptor from which we can get the runtime rank,
and we get a descriptorless array of rank -1 with unset bounds.
No wonder it doesn't work.
