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    SubjectRe: [RFC] Get rid of SUBARCH
    On 08/21/2013 07:07:33 AM, Geert Uytterhoeven wrote:
    > On Wed, Aug 21, 2013 at 10:19 AM, Richard Weinberger <richard@nod.at>
    > wrote:
    > > This series is an attempt to remove the SUBARCH make parameter.
    > > It as introduced at the times of Linux 2.5 for UML to tell the UML
    > > build system what the real architecture is.
    > >
    > > But we actually don't need SUBARCH, we can store this information
    > > in the .config file.
    >
    > Haha, now you have OS_ARCH (shouldn't that be called HOST_ARCH?)
    > instead,
    > which is available only for UM?
    >
    > > The series touches also m68k, sh, mips and unicore32.
    > > These architectures magically select a cross compiler if ARCH !=
    > SUBARCH.
    > > Do really need that behavior?
    >
    > This does remove functionality.
    > It allows to build a kernel using e.g. "make ARCH=m68k".

    make ARCH=m68k CROSS_COMPILE=m68k-
    make ARCH=arm CROSS_COMPILE=armv5l-
    make ARCH=sparc CROSS_COMPILE=sparc-
    make ARCH=ppc CROSS_COMPILE=powerpc-
    make ARCH=sh CROSS_COMPILE=sh4-
    make ARCH=mips CROSS_COMPILE=mipsel-
    make ARCH=x86 CROSS_COMPILE=i686-
    make ARCH=alpha CROSS_COMPILE=alpha-

    Works the same way on all the targets I've tried so far. You specify
    the architecture, you specify the cross compiler prefix, you feed it a
    config file, you build.

    (If a target supplies its own default cross compiler prefix I just have
    to override it with what mine's called anyway...)

    > Perhaps this can be moved to generic code? Most (not all!)
    > cross-toolchains
    > are called $ARCH-{unknown-,}linux{,-gnu}.
    > Exceptions are e.g. am33_2.0-linux and bfin-uclinux.

    The linaro toolchain is arm-linux-gnueabihf- and the one on kernel.org
    is arm-unknown-linux-gnueabi- and the one I build is armv5l- (because
    the FSF's
    $ARCH-unknown-gnu-format-tuple-all-hail-stallman-gnu-gnu-gnu-dammit-gcc
    is just nuts: why would I say -linux- in a linux-to-linux toolchain? Do
    windows toolchains say -windows-?)

    Other toolchain sources use other prefixes (-unknown- is often
    -$VENDORNAME-), and then of course there's llvm... which is why you
    specify CROSS_COMPILE= on the make command line.

    Rob

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