Compiling busybox for ARM-V7

[Denys Vlasenko]

I use a .config way of doing that:

CONFIG_CROSS_COMPILER_PREFIX="i486-linux-uclibc-"

On Fri, Jan 6, 2017 at 2:00 PM, Kang-Che Sung <explorer09 at gmail.com> wrote:
> On Fri, Jan 6, 2017 at 7:54 PM, Bob Dunlop <bob.dunlop at xyzzy.org.uk> wrote:
>> I'm not sure passing the parameters to make like this works,
>> they don't get passed to sub processes ?  I've always set them
>> in the environment so all children are guaranteed to see them.
>>
>> I'd stick the commands in a scripts for easy repetition and tweaking.
>> Something like this:
>>
>>   #!/bin/bash
>>
>>   # Export cross build parameters to environment
>>   export ARCH=arm
>>   export CROSS_COMPILE=arm-cortex_a15-linux-gnueabihf-
>>
>>   # Put compiler bin in the front of my PATH (automatically exported)
>>   TOOLCHAIN=/home/zvivered/module/CARD/linux4.1.13/toolchain
>>   PATH=$TOOLCHAIN/crosstool/release/bin:$PATH
>>
>>   # Build
>>   make clean
>>   make defconfig
>>   make
>>
>>   # Use absolute path for install directory
>>   make CONFIG_PREFIX=$(pwd)/../../../rootfs install
>
> Makefiles don't always honor environment variables like you expect.
> In most cases you are expected to *overwrite* certain variables, for
> example $CC to make it work. If unsure, read the makefile code.
>
> Do you know the difference between these two make invocations?
>
> # This overwrites $CC so that make will use your value despite how
> # makefile defines the variable $CC.
> make CC=arm-cortex_a15-linux-gnueabihf-gcc
> # This sets $CC as environment variable before invoking make, but
> # makefile may not honor the variable.
> CC=arm-cortex_a15-linux-gnueabihf-gcc make
>
> I would recommend against having $ARCH or $CROSS_COMPILE
> defined as environment variables. It's better to use overwrite method
> for these two. (But it's safe to export $PATH environment variable
> because makefiles defining it to something else is unlikely.)
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