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Date:      Mon, 23 Dec 2019 15:56:16 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 242835] concurrency issue when building kernel with 'make -j8': make[5]: make[5]: don't know how to make opt_global.h. Stop
Message-ID:  <bug-242835-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D242835

            Bug ID: 242835
           Summary: concurrency issue when building kernel with 'make
                    -j8': make[5]: make[5]: don't know how to make
                    opt_global.h. Stop
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: d8zNeCFG@aon.at

Scenario:
- System running FreeBSD 13.0-CURRENT #0 r355526M: Sun Dec  8 16:30:56 CET =
2019
- /usr/src updated to r356034 (head)
- Executing 'make -j8 buildworld buildkernel KERNCONF=3D...'

Result:
- In most cases, the make fails with
    >>> stage 3.1: building everything
    ...
    make[4]: make[4]: don't know how to make opt_global.h. Stop

Notes:
- Omitting -j8 gets the build to succeed

It seems that the parallel makes repeatedly recreate opt_global.h, thereby
thrashing each other's copies.

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