[Patch, Fortran, pr70397, v1] [5/6 Regression] ice while allocating ultimate polymorphic

[Andre Vehreschild]

Hi all,

here is the trunk version of the patch for the regression reported in
pr70397. Applying the gcc-5 patch to trunk lead to a regression, which
the modified patch resolves now. The technique to solve the ice is
the same as for gcc-5:

> The routine gfc_copy_class_to_class() assumed that both the source
> and destination object's type is unlimited polymorphic, but in this
> case it is true for the destination only, which made gfortran look
> for a non-existent _len component in the source object and therefore
> ICE. This is fixed by the patch by adding a function to return either
> the _len component, when it exists, or a constant zero node to init
> the destination object's _len component with.

Bootstrapped and regtested on x86_64-linux-gnu/F23. Ok for trunk?

Regards,
	Andre

PS: Yes, Paul, I know you accepted the patch for gcc-5 for trunk
also, but I feel safer when the changes made get additional approval.
-- 
Andre Vehreschild * Email: vehre ad gmx dot de 
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