[clang] [InstallAPI] Add installapi specific options & diagnostics (PR #85100)

[Juergen Ributzka via cfe-commits]

================
@@ -126,9 +178,77 @@ bool Options::processFrontendOptions(InputArgList &Args) {
   return true;
 }
 
+std::vector<const char *>
+Options::processAndFilterOutInstallAPIOptions(ArrayRef<const char *> Args) {
+  std::unique_ptr<llvm::opt::OptTable> Table;
+  Table.reset(createDriverOptTable());
+
+  unsigned MissingArgIndex, MissingArgCount;
+  auto ParsedArgs = Table->ParseArgs(Args.slice(1), MissingArgIndex,
+                                     MissingArgCount, Visibility());
+
+  // Capture InstallAPI only driver options.
+  DriverOpts.Demangle = ParsedArgs.hasArg(OPT_demangle);
+
+  if (auto *A = ParsedArgs.getLastArg(OPT_filetype)) {
+    DriverOpts.OutFT = TextAPIWriter::parseFileType(A->getValue());
+    if (DriverOpts.OutFT == FileType::Invalid) {
+      Diags->Report(clang::diag::err_drv_invalid_value)
+          << A->getAsString(ParsedArgs) << A->getValue();
+      return {};
+    }
+  }
+
+  if (const Arg *A = ParsedArgs.getLastArg(OPT_verify_mode_EQ)) {
+    DriverOpts.VerifyMode =
+        StringSwitch<VerificationMode>(A->getValue())
+            .Case("ErrorsOnly", VerificationMode::ErrorsOnly)
+            .Case("ErrorsAndWarnings", VerificationMode::ErrorsAndWarnings)
+            .Case("Pedantic", VerificationMode::Pedantic)
+            .Default(VerificationMode::Invalid);
+
+    if (DriverOpts.VerifyMode == VerificationMode::Invalid) {
+      Diags->Report(clang::diag::err_drv_invalid_value)
+          << A->getAsString(ParsedArgs) << A->getValue();
+      return {};
+    }
+  }
+
+  if (const Arg *A = ParsedArgs.getLastArg(OPT_verify_against))
+    DriverOpts.DylibToVerify = A->getValue();
+
+  /// Any unclaimed arguments should be forwarded to the clang driver.
+  std::vector<const char *> StringList(ParsedArgs.size());
----------------
ributzka wrote:

`StringList` is a very generic variable name for a list of arguments. How about `ClangDriverArgs` or `FilteredArgs` instead?

https://github.com/llvm/llvm-project/pull/85100