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Brad King authored
Under job server integration, added by commit 80fe56c4 (ctest: Add support for running under a make job server on POSIX systems, 2023-11-15, v3.29.0-rc1~324^2), use a very high default so that parallelism is effectively limited only by available job server tokens. Otherwise, choose a default limit based on the number of processors. Also allow passing `0` to specify unbounded parallelism. Fixes: #25739
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