================
@@ -525,6 +525,19 @@ TEST(CommandMangler, RespectsOriginalSysroot) {
                 Not(HasSubstr(testPath("fake/sysroot"))));
   }
 }
+TEST(CommandMangler, ClangUnknownArgs) {
+  // Check that clang-cl-specific will drop unknown flags
+  const auto Mangler = CommandMangler::forTests();
+  {
+    tooling::CompileCommand Cmd;
+    Cmd.CommandLine = {"clang++", "-std=c++23", "--unknown-flag=abcd.flag"};
+    Mangler(Cmd, "foo.cc");
+    EXPECT_THAT(llvm::join(Cmd.CommandLine, " "),
+                Not(HasSubstr("--unknown-flag=abcd.flag")));
+    EXPECT_THAT(llvm::join(Cmd.CommandLine, " "),
+                HasSubstr("--std=c++23"));
----------------
Decodetalkers wrote:

ok, that was a mistake, I have fixed that

https://github.com/llvm/llvm-project/pull/200001
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