[clang-tools-extra] [clangd] [C++20] [Modules] Support code complete for C++20 modules (PR #110083)

[kadir çetinkaya via cfe-commits]

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@@ -2122,7 +2125,10 @@ clang::CodeCompleteOptions CodeCompleteOptions::getClangCompleteOpts() const {
   // When an is used, Sema is responsible for completing the main file,
   // the index can provide results from the preamble.
   // Tell Sema not to deserialize the preamble to look for results.
-  Result.LoadExternal = !Index;
+  //
+  // FIXME: If we're using C++20 modules, force the lookup process to load external decls,
+  // since currently the index doesn't support C++20 modules.
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kadircet wrote:

i think this comment belongs to `ClangdMain.cpp` instead.

https://github.com/llvm/llvm-project/pull/110083