================
@@ -0,0 +1,24 @@
+//===- clang/unittests/AllClangUnitTests.cpp 
------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM 
Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/TargetSelect.h"
+#include "gtest/gtest.h"
+
+// This custom main entry point for the AllClangUnitTests binary registers all
+// tests on startup, so the tests don't become sensitive to target registration
+// within the test suite.
+int main(int argc, char **argv) {
+  ::testing::InitGoogleTest(&argc, argv);
+  llvm::cl::ParseCommandLineOptions(argc, argv);
+
+  llvm::InitializeAllTargets();
----------------
rnk wrote:

Done, sorry, I copied this from 
[`driver.cpp`](https://github.com/llvm/llvm-project/blob/main/clang/tools/driver/driver.cpp#L246),
 so I didn't get all this goop.

https://github.com/llvm/llvm-project/pull/144428
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