
libclc sequential build issue addressed in commit 0c21d6b4c8ad is specific to cmake MSVC generator. Therefore, this PR avoids creating a large number of targets when a non-MSVC generator is used, such as the Ninja generator, which is used in pre-merge CI on Windows in llvm-project repo. We plan to migrate from MSVC generator to Ninja generator in our downstream CI to fix flaky cmake bug `Cannot restore timestamp`, which might be related to the large number of targets.
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