[Libclc-dev] libclc + llvm: enabling extensions

[Tom Stellard]

On Thu, Jan 15, 2015 at 09:42:30AM -0500, Richard Gorton wrote:
> 
> Hi,
> 
> I'm working with libclc/llvm, and encountered a compilation error on generic/include/clc/clc.h
> 
> #ifndef cl_clang_storage_class_specifiers
> #error Implementation requires cl_clang_storage_class_specifiers extension!
> #endif
> 
> Quite reasonable; as I'm investigating what goes on in LLVM3.5 I do not see any apparent instances where the various features are turned on for a given target.  What (if any) is the 'normal' convention used to turn the various extensions on or off for a given target?
> 

There is no convention for this, but what I would suggest is to wrap any extended features
in:

#if feature_x
...
#endif

And then have either you OpenCL implementation or the target defintion in
clang enable them by defining feature_x.

This won't work for all extensions, though.  If you want to enable an extension
that adds a new type, you will need to make modifications to clang.

-Tom

> Regards,
> 
> 	Richard Gorton
> 	rcgorton at cog-e.com
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