use process jobs #6536
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use process jobs #6536
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Many toolchain tools written for POSIX systems rely on the exec system call. Unfortunately, it is not possible to implement `exec` in a POSIX-compliant manner on Windows. In particular, the semantics of the `exec` implementation provided by the widely-used `msvcrt` C runtime will cause process's waiting on the `exec`'ing process to incorrectly conclude that the process has successfully terminated when in fact it is still running in another process. For this reason, the `process` library exposes the `use_process_jobs` flag to use a more strict (although still not POSIX-compliant) mechanism for tracking process completion. This is explained in this comment [2]. Unfortunately, job support in the `process` library is currently quite broken and was only recently fixed [1]. Consequently, we only enable job object support for process releases >= 1.6.8. [1] haskell/process#168 [2] https://github.com/haskell/process/blob/master/System/Process.hs#L399
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Backported to 3.2 in #7134 |
This was referenced Feb 28, 2021
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Supersedes #6529