Re: CONFIG_MODVERSIONS problem identified

From: Andreas Schwab (schwab@suse.de)
Date: Thu Jul 27 2000 - 11:39:28 EDT

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    Mikael Pettersson <mikpe@csd.uu.se> writes:

    |> I wrote:
    |>
    |> >Possible solutions:
    |> >...
    |> >C. Change the Linux kernel to work around this problem. We either:
    |> > C1. forcibly remake modversions.h in each subdir's `fastdep', or
    |> > C2. don't create modversions.h at all in the subdirs, but only
    |> > once in the toplevel Makefile after doing dep-files.
    |> >
    |> >I'll do a patch to implement solution C1, unless someone has
    |> >a much better idea.
    |>
    |> I had a couple of requests to go with C2 instead of C1, since
    |> it has less overhead and works better with parallel makes.

    Note that your patch definitely does *not* work with parallel makes.

    |> --- linux-2.4.0-test5-pre6/Makefile.~1~ Thu Jul 27 13:15:00 2000
    |> +++ linux-2.4.0-test5-pre6/Makefile Thu Jul 27 13:44:47 2000
    |> @@ -442,10 +442,11 @@
    |> MODVERFILE := $(TOPDIR)/include/linux/modversions.h
    |> else
    |> MODVERFILE :=
    |> +update-modverfile:
    |> endif
    |> export MODVERFILE
    |>
    |> -depend dep: dep-files $(MODVERFILE)
    |> +depend dep: dep-files update-modverfile

    update-modverfile does not depend on dep-files, thus they will be built in
    parallel, and update-modverfile will likely read old .ver files.

    Andreas. 

    -- 
Andreas Schwab                                  "And now for something
SuSE Labs                                        completely different."
Andreas.Schwab@suse.de
SuSE GmbH, Schanzäckerstr. 10, D-90443 Nürnberg

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