[PATCH] D125243: [OpenCL] Make -cl-ext a driver option

[Anastasia Stulova via Phabricator via cfe-commits]

Anastasia created this revision.
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For generic targets such as SPIR-V clang sets all OpenCL extensions/features as supported by default. However targets are unlikely to support all extensions/features which creates a problem when such generic SPIR-V binary is compiled for a specific target later on.

For SPIR-V we will likely provide control of extensions via vendor components in the target triple: https://discourse.llvm.org/t/setting-version-environment-and-extensions-for-spir-v-target, however this doesn't eliminate the need of finer-grained control of extensions for example to support some specific or emerging target architectures.

Therefore this patch exposes `-cl-ext` flag for finer-grained control of extensions and features being targeted in the OpenCL kernels to improve error reporting and control of features generated in generic binaries like SPIR-V.


https://reviews.llvm.org/D125243

Files:
  clang/docs/OpenCLSupport.rst
  clang/docs/UsersManual.rst
  clang/include/clang/Driver/Options.td
  clang/lib/Driver/ToolChains/Clang.cpp
  clang/test/Driver/opencl.cl

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