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    SubjectRe: [PATCH] preserve ARCH and CROSS_COMPILE in the build directory generated Makefile
    On Fri, Apr 29, 2005 at 11:00:53PM +0200, Sam Ravnborg wrote:
    > On Fri, Apr 29, 2005 at 01:35:33PM +0200, Pavel Pisa wrote:
    > > This patch ensures, that architecture and target cross-tools prefix
    > > is preserved in the Makefile generated in the build directory for
    > > out of source tree kernel compilation. This prevents accidental
    > > screwing of configuration and builds for the case, that make without
    > > full architecture specific options is invoked in the build
    > > directory. It is secure use accustomed "make", "make xconfig",
    > > etc. without fear and special care now.
    >
    > Hi Pavel.
    > I will not apply this path because it introduce a difference when
    > building usign a separate output direcory compared to an in-tree build.
    >
    > I have briefly looked into a solution where I could add this information
    > in .config but was sidetracked by other stuff so I newer got it working.
    >
    > The build system for the kernel needs to be as predictable as possible
    > and introducing functionality that is only valid when using a separate
    > output directory does not help here.

    Without it, folk will then do (and this is taken from someone elses
    example):

    cd /usr/src
    tar -xjf /path/to/linux-2.6.x.tar.bz
    cd linux-2.6.x
    mkdir -p _build/arm
    cd _build/arm
    cat >GNUmakefile <<EOF
    VERSION = 2
    PATCHLEVEL = 6

    KERNELSRC := /usr/src/linux-2.6.x
    KERNELOUTPUT := /usr/src/linux-2.6.x/_build/arm

    MAKEFLAGS += --no-print-directory

    ARCH = arm
    #CROSS_COMPILE = arm-unknown-linux-gnu-
    CROSS_COMPILE = arm-linux-

    all:
    $(MAKE) ARCH=$(ARCH) CROSS_COMPILE=$(CROSS_COMPILE) -C $(KERNELSRC) O=$(KERNELOUTPUT)

    %::
    $(MAKE) ARCH=$(ARCH) CROSS_COMPILE=$(CROSS_COMPILE) -C $(KERNELSRC) O=$(KERNELOUTPUT) $@
    EOF
    make xconfig
    make

    which I think you'll agree is far worse.

    --
    Russell King
    Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
    maintainer of: 2.6 Serial core
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