parallel build failure in "make includes" with same rules being run multiple times in parallel

["Greg A. Woods" <woods%planix.ca@localhost>]

I just had the following happen during a build with '-j 12', in the
"make includes" phase.  This looks like a parallel build race failure
where the same rules were run in parallel when they shouldn't have done
so.  (I'm pretty sure I've seen similar races in other parts of the tree
before too, but I've just brushed it off and re-ran the build.)

    mv: rename gthr-single.h.tmp to gthr-single.h: No such file or directory
    mv: rename gthr.h.tmp to gthr.h: No such file or directory
    --- gthr-single.h ---
    *** [gthr-single.h] Error code 1

    nbmake[7]: stopped in /work/woods/m-NetBSD-current/external/gpl3/gcc/lib/libstdc++-v3/include/bits

If I go there and run it by hand all is well:

    $ cd external/gpl3/gcc/lib/libstdc++-v3/include/bits/
    $ mynbmake includes
        install  /build/woods/b2/current-amd64-destdir/usr/include/g++/bits/basic_file.h
        install  /build/woods/b2/current-amd64-destdir/usr/include/g++/bits/c++allocator.h
        install  /build/woods/b2/current-amd64-destdir/usr/include/g++/bits/c++io.h
        install  /build/woods/b2/current-amd64-destdir/usr/include/g++/bits/c++locale.h
        install  /build/woods/b2/current-amd64-destdir/usr/include/g++/bits/gthr-posix.h
        install  /build/woods/b2/current-amd64-destdir/usr/include/g++/bits/gthr-single.h
        install  /build/woods/b2/current-amd64-destdir/usr/include/g++/bits/gthr.h
        install  /build/woods/b2/current-amd64-destdir/usr/include/g++/bits/messages_members.h
        install  /build/woods/b2/current-amd64-destdir/usr/include/g++/bits/opt_random.h
        install  /build/woods/b2/current-amd64-destdir/usr/include/g++/bits/time_members.h
    includes ===> arch
    includes ===> arch/i386
    includes ===> arch/x86_64

Given a quick look at the Makefile in that directory I'm guessing it
needs to be re-written to serialize the build of the three headers
gthr.h, gthr-single.h, and gthr-posix.h, but I'm not sure exactly how to
accomplish that in this context.

--
					Greg A. Woods <gwoods%acm.org@localhost>

Kelowna, BC     +1 250 762-7675           RoboHack <woods%robohack.ca@localhost>
Planix, Inc. <woods%planix.com@localhost>     Avoncote Farms <woods%avoncote.ca@localhost>

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