[PATCH] D77910: AMDGPU: Define cl_khr_gl_sharing as a supported extension

[Brian Sumner via Phabricator via cfe-commits]

b-sumner added a comment.

In D77910#2015225 <https://reviews.llvm.org/D77910#2015225>, @arsenm wrote:

> In D77910#1989163 <https://reviews.llvm.org/D77910#1989163>, @b-sumner wrote:
>
> > In D77910#1988807 <https://reviews.llvm.org/D77910#1988807>, @arsenm wrote:
> >
> > > In D77910#1981828 <https://reviews.llvm.org/D77910#1981828>, @b-sumner wrote:
> > >
> > > > In D77910#1981429 <https://reviews.llvm.org/D77910#1981429>, @arsenm wrote:
> > > >
> > > > > In D77910#1976171 <https://reviews.llvm.org/D77910#1976171>, @b-sumner wrote:
> > > > >
> > > > > > I don't think we can guarantee this is or will be supported on all devices.  The language runtime makes this decision.
> > > > >
> > > > >
> > > > > We don't need to worry about theoretical devices. We should know the properties of the driver from -amdhsa, -amdpal, -mesa3d
> > > >
> > > >
> > > > It takes more than support in the ISA for some features.  The OpenCL driver may not want to support a given optional feature, e.g. images.  I'm not opposed to defaults, but if the driver chooses to not support images, it needs to be able to prevent `__IMAGE_SUPPORT__` from being defined.  Conformance will fail if the runtime and compiler are not consistent.
> > >
> > >
> > > The driver details should be captured by the the triple. If some weird driver decided to do something different, we would need to add a new triple for it. We don't have such a driver, so I don't see why worry about it. It's possible to work around with undef and redef in an implicitly included header. We need to fix properties of the driver based on the target to have perfectly matching offline compilation
> >
> >
> > I don't see anywhere in the triple talking about driver specific details, unless you would use the environment?  That seems like overkill to me.  But again, I'm not opposed to defaults, and as long as the driver can override them, this should be OK.
>
>
> The OS is the driver. It doesn't need to specifically encode these details; the OS should encode properties of the driver environment. Anything using -amdhsa should be reporting image support


But that's not how things work now or are likely to work in the future.  The language runtime is what decides if it is going to report the availability of image support.  For offline compilation, I suppose it is OK to assume images are supported, but for online compilation, the language runtime needs to be able to reflect its own decision.


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https://reviews.llvm.org/D77910