rsmith added inline comments.
================
Comment at: include/clang/Basic/DiagnosticSemaKinds.td:7907
@@ -7904,1 +7906,3 @@
+def ext_opencl_ext_vector_type_rgba_selector: ExtWarn<
+ "vector component name '%0' is an OpenCL version 2.2 feature">;
} // end of sema category
----------------
As mentioned, normal Clang policy is to issue an `ExtWarn` in such cases unless
there is some actual problem with accepting the feature as an extension. This
*does* cause us to produce a diagnostic, which, as you say, is important.
The C and C++ standards are both clear that producing a diagnostic is a
sufficient response to code that is ill-formed, and that we are still allowed
to accept the program after producing the diagnostic; if the OpenCL
specification says something else, it is simply broken and we should get it
fixed.
================
Comment at: test/Misc/warning-flags.c:15-19
@@ -14,7 +14,7 @@
If you add a new warning without a flag, this test will fail. To fix
this test, simply add a warning group to that warning.
The list of warnings below should NEVER grow. It should gradually shrink to 0.
----------------
Please follow these instructions.
http://reviews.llvm.org/D20602
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