[libc] [clang] [lld] [llvm] [lldb] [libcxx] [clang-tools-extra] [flang] [OpenACC] Initial commits to support OpenACC (PR #70234)

[Bruno Cardoso Lopes via cfe-commits]

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@@ -1342,6 +1342,15 @@ def err_opencl_logical_exclusive_or : Error<
 def err_openclcxx_virtual_function : Error<
   "virtual functions are not supported in C++ for OpenCL">;
 
+// OpenACC Support.
+def warn_pragma_acc_ignored : Warning<
+  "unexpected '#pragma acc ...' in program">, InGroup<SourceUsesOpenACC>, DefaultIgnore;
+def err_acc_unexpected_directive : Error<
+  "unexpected OpenACC directive %select{|'#pragma acc %1'}0">;
+def warn_pragma_acc_unimplemented
+    : Warning<"OpenACC Directives not yet implemented, pragma ignored">,
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bcardosolopes wrote:

Does `Directives` need to be capitalized?

https://github.com/llvm/llvm-project/pull/70234