[R-pkg-devel] flang doesn't support derived types

[Othman El Hammouchi]

Hello once again,


Unfortunately, I didn't receive a reply to the mail I sent CRAN nor the 
follow-up/reminder I sent on 2024-05-09. It's been nearly a month now. I 
understand they're busy of course, but it's a bit disheartening not to 
know what one can do to remedy the situation after putting in so much 
work to try to get it published. Would you (or anyone else) have some 
pointers as to how I can receive a reply from CRAN?


Yours,


Othman El Hammouchi

On 10/05/2024 08:04, Othman El Hammouchi wrote:
> Dear Ivan,
>
>
> Thanks again for the help, you've given me some great pointers to 
> pursue. I will keep you posted on what CRAN responds and whether I 
> find a workaround.
>
> > I do wish that flang-new would be a better compiler or at least a
> > better documented one, but instead of a list of features on their
> > website, I can only see "Getting Involved [3] for tips on how to get in
> > touch <...> and to learn more about the current status". There is only
> > so many projects one can get involved in.
>
> The problem is not the quality of the compiler so much as the fact 
> that it's not finished. They don't make a big secret of the fact that 
> it's still under development. It may be the standard in industry as 
> you say, but it would greatly surprise me if it was the default for 
> most ordinary users. Most distros and platforms seem to ship the (much 
> more complete) gfortran.
>
>
> Yours,
>
>
> Othman El Hammouchi
>
> On 09/05/2024 18:34, Ivan Krylov wrote:
>> В Thu, 09 May 2024 15:31:25 +0000
>> Othman El Hammouchi <othman.el.hammouchi using protonmail.com> пишет:
>>
>>> Do I understand it correctly that there is no way to specify a
>>> Fortran standard in the SystemRequirements?
>> It's possible (and even recommended) to describe the Fortran version
>> requirement in SystemRequirements [1], but this field is for now mostly
>> informational. I think I remember efforts to standardise it, but they
>> are far from complete.
>>
>>> I had resubmitted my package in the mean time with a configure script
>>> that aborts the install if the compiler does not support
>>> polymorphism, but I understand that this is a fruitless avenue for
>>> CRAN?
>> Signs point to yes, at least judging by a previous time we had
>> flang-related problems [2]. On the other hand, there were relatively
>> easy workarounds that time, and here I'm not seeing anything as simple.
>>
>>> I should point out my local flang install is version 16, but I cannot
>>> install 18 on my system since it's in unstable (this again
>>> underscores the problem of developing under these constraints).
>> Would you consider containers for this purpose? I was able to reproduce
>> the problem relatively quickly by starting podman run --rm -it
>> debian:sid and installing flang-18 in there. (Unlike Docker a few years
>> ago, podman can be installed straight from the repository, at least on
>> Debian, and doesn't require adding users to special groups in order to
>> work. Maybe Docker has also improved.) I don't like containers as a
>> basis for software distribution, but I can't deny that they are being
>> great at letting me quickly reproduce problems without installing 10
>> different GNU/Linux distros.
>>
>>> What would you advise? And don't you think these Fortran constraints
>>> should be better documenten.
>> I'm afraid I don't have any more specific advice besides testing your
>> workarounds with Debian Sid in a container or a virtual machine or a
>> chroot. I can try to take a look at more concrete problems. I hope you
>> will be able to find a relatively painless workaround.
>>
>> I do wish that flang-new would be a better compiler or at least a
>> better documented one, but instead of a list of features on their
>> website, I can only see "Getting Involved [3] for tips on how to get in
>> touch <...> and to learn more about the current status". There is only
>> so many projects one can get involved in.
>>
>> -- 
>> Best regards,
>> Ivan
>>
>> [1]
>> https://cran.r-project.org/doc/manuals/R-exts.html#Using-modern-Fortran-code 
>>
>>
>> [2]
>> https://stat.ethz.ch/pipermail/r-package-devel/2023q4/010065.html
>>
>> [3]
>> https://flang.llvm.org/docs/GettingInvolved.html