jdenny added a comment.

Thanks for the reviews.

In D106509#2896351 <https://reviews.llvm.org/D106509#2896351>, @ABataev wrote:

> That's strange that we need to ignore `delete` modifier,

It's not ignored in general: the standard (dynamic) OpenMP reference count is 
set to 0 (if it isn't already) so that, once `hold` is not in effect, the data 
can be unmapped.

> I would say that most probably there is a bug in the user's code.

Yes, my understanding of the motivation for this OpenACC feature is to protect 
users from unbalanced increments and decrements.  In structured cases, the 
assumption is that it's unlikely the user intends to unmap early.

>> Clang currently doesn't support OpenMP 5.1 features unless 
>> -fopenmp-version=51. Does it make sense to have an option to enable 
>> extensions? Instead of a separate option, we could accept something like 
>> -fopenmp-version=51,hold,foo.
>
> I would just add a new options `-fopenmp-extension` or something like this 
> just toenable all non-standard extensions, better to keep `-fopenmp-version` 
> as is.

Works for me.  I suppose if we later want a syntax for enabling specific 
extensions, `-fopenmp-extension` could become an alias for 
`-fopenmp-extension=all`.

>> In Clang diagnostics, this patch does not add hold to the list of acceptable 
>> map type modifiers because it's an extension. Should it? If there were a 
>> command-line option to enable extensions, that would make the path clearer.
>
> Yes, with the extensions enabled it should generate the list of all supported 
> modifiers.

Agreed.

In D106509#2896399 <https://reviews.llvm.org/D106509#2896399>, @ABataev wrote:

> In D106509#2896398 <https://reviews.llvm.org/D106509#2896398>, @jdoerfert 
> wrote:
>
>> I would propose we prefix these new clauses and such with `ompx_`.
>
> +1 here

That's fine for me, but don't the routines use `llvm_omp_`?

Should we also have that prefix in various enumerators in the implementation?  
For example, what does `OMP_MAP_HOLD` become?


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D106509/new/

https://reviews.llvm.org/D106509

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