[clang] [clang-tools-extra] [clangd] Support clang-cl flags /std:c++23preview and /std:clatest (PR #178080)

[Nico Weber via cfe-commits]

================
@@ -535,13 +535,30 @@ TEST(CommandMangler, StdLatestFlag) {
   EXPECT_THAT(llvm::join(Cmd.CommandLine, " "), HasSubstr("/std:c++latest"));
 }
 
-TEST(CommandMangler, StdLatestFlag_Inference) {
+TEST(CommandMangler, ClangClStdFlags_Inference) {
   const auto Mangler = CommandMangler::forTests();
-  tooling::CompileCommand Cmd;
-  Cmd.CommandLine = {"clang-cl", "/std:c++latest", "--", "/Users/foo.cc"};
-  Mangler(Cmd, "/Users/foo.hpp");
-  // Check that the /std:c++latest flag is not dropped during inference
----------------
nico wrote:

Done. Thanks!

https://github.com/llvm/llvm-project/pull/178080