[clang-tools-extra] [clangd] [C++20] [Modules] Introduce initial support for C++20 Modules (PR #66462)

[Chuanqi Xu via cfe-commits]

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@@ -192,8 +192,10 @@ TEST(PreamblePatchTest, PatchesPreambleIncludes) {
   TU.AdditionalFiles["b.h"] = "";
   TU.AdditionalFiles["c.h"] = "";
   auto PI = TU.inputs(FS);
-  auto BaselinePreamble = buildPreamble(
-      TU.Filename, *buildCompilerInvocation(PI, Diags), PI, true, nullptr);
+  MockCompilationDatabase CDB;
+  auto BaselinePreamble =
+      buildPreamble(TU.Filename, *buildCompilerInvocation(PI, Diags), PI, true,
+                    /*RequiredModuleBuilder=*/nullptr, nullptr);
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ChuanqiXu9 wrote:

Agreed.  Done by adding an end-to-end test in the end of `PrerequisiteModulesTest.cpp`.

https://github.com/llvm/llvm-project/pull/66462