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    SubjectRe: [PATCH] Symlinks for building external modules
    On Fri, Jun 04, 2004 at 08:15:02PM +0300, Jari Ruusu wrote:
    >
    > How long have you recommended building external modules like this:
    >
    > make -C /lib/modules/`uname -r`/build modules SUBDIRS=`pwd`
    > or
    > make -C /lib/modules/`uname -r`/build modules M=`pwd`
    >
    > Now they all have to be changed to:
    >
    > make -C /lib/modules/`uname -r`/source modules SUBDIRS=`pwd`
    > or
    > make -C /lib/modules/`uname -r`/source modules M=`pwd`

    That would not work either.
    You need to tell kbuild both where to find the source and the output files.
    So you have to specify both -C ... and O=...
    KERNEL=/lib/modules/`uname -r`
    make -C $KERNEL/source O=$KERNEL/build M=`pwd`

    There is no way to do the proposed chang and be backward compatible
    when the kernel is build using seperate output directories.

    Think of the following situation
    /usr/src/linux-2.6.6-xx/ <= kernel src

    /lib/modules/linux-2.6.6-xx-smp/build/ <= output files (or a symlink to them)
    /lib/modules/linux-2.6.6-xx-smp/source/ <= symlink to kernel src

    /lib/modules/linux-2.6.6-xx-up/build/ <= output files (or symlink)
    /lib/modules/linux-2.6.6-xx-up/source/ <= symlink to kernel src

    /lib/modules/linux-2.6.6-xx-4g/build/ <= output files (or symlink)
    /lib/modules/linux-2.6.6-xx-4g/source/ <= symlink to kernel src

    Notice they all share the _same_ kernel src.
    We just have three different .config files.

    If there is a way to be backward compatible with
    this feature please demonstrate it.

    Plese note that the patch Andreas made did not break existing setups
    if a seperate output directory was not used. The only effect
    would be an additional symlink to the same dir. (build and source would
    be links to the same dir).


    Andreas - please expalin why you want build to be a symlink, and not
    the directory used when actually building the kernel.

    Sam

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