*PING* — Re: Fortran: Create CLASS(*) early to avoid ICE [PR99254]

[Tobias Burnus <tobias@codesourcery.com>]

*PING*

I think the patch is an improvement, even though there is a small
regression and many issues are not covered: PR fortran/99266 and as
explained below.

On 25.02.21 12:16, Tobias Burnus wrote:
> The issue is that for CLASS – and in particular CLASS(*)
> the ts.u.derived->components is not yet created when it is
> accessed. – PR99138 shows a similar case (unfixed!
> See comment 5 and initial report for two examples).
>
> There is an issue for code like:
>   class(*) var
>   dimension :: var(..)
> that the attribute is not properly encoded in the class.
> That's independent of this patch, cf. PR fortran/99266.
>
> NOTE: This patch causes a regression:
>   subroutine foo()
>     class(*) :: x
>     allocatable :: x
> is now rejected with:
>   CLASS variable ‘x’ at (1) must be dummy, allocatable or pointer
>
> HOWEVER: While that was accepted before,
>   subroutine foo(dummy)
>     class(*) :: dummy
>     allocatable :: dummy
> failed before and still fails. (→ class_ok handling in
> gfc_build_class_symbol).
>
> All those issues are tracked in that PR fortran/99266.
>
> OK for the trunk? What about GCC 10??
>
> I am unsure about GCC 10 due to the new regression;
> the issue (PR99254) was reported as new ICE between
> 20190825 and 20190901.
>
> Tobias
>
> PS: I still do not like the way we represent CLASS internally,
> but I think I had complained about this already years ago...
> Can proponents of the current way please look at
> PR fortran/99266 ?
>
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