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

[Erich Keane via cfe-commits]

================
@@ -4001,6 +4008,14 @@ bool CompilerInvocation::ParseLangArgs(LangOptions &Opts, ArgList &Args,
                         (T.isNVPTX() || T.isAMDGCN()) &&
                         Args.hasArg(options::OPT_fopenmp_cuda_mode);
 
+  // OpenACC Configuration.
+  if (Args.hasArg(options::OPT_fopenacc)) {
+    Opts.OpenACC = true;
----------------
erichkeane wrote:

I likely will in the future, however as we currently don't have support for multiple versions of OpenACC, we only need 'true' or 'false'.  So for now, it seems prudent to not do that yet (as it won't be used).

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