[PATCH] D126660: [OpenCL] Reword unknown extension pragma diagnostic

[Sven van Haastregt via Phabricator via cfe-commits]

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svenvh added reviewers: Anastasia, stuart.
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For newer OpenCL extensions that do not require a pragma, such as
`cl_khr_subgroup_shuffle`, a user could still accidentally attempt to
use a pragma.  This would result in a warning

  "unknown OpenCL extension 'cl_khr_subgroup_shuffle' - ignoring"

which could be mistakenly interpreted as "Clang does not support this
extension at all" instead of "Clang does not require any pragma for
this extension".


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D126660

Files:
  clang/include/clang/Basic/DiagnosticParseKinds.td
  clang/test/Headers/opencl-c-header.cl
  clang/test/Parser/opencl-pragma.cl
  clang/test/SemaOpenCL/extension-begin.cl
  clang/test/SemaOpenCL/extension-version.cl

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