[Buildroot] ARCH not being sent by make menuconfig - kernel compile fails to start

[William Pettersson <enigma@strudel-hound.com>]

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William Pettersson wrote:
> First off, sorry for the cross-post.  I posted this to the busybox
> mailing list first, instead of the buildroot list.  My bad there, but
> since that was completely the wrong mailing list, I'm posting it here.
> 
> 
> So, I'm trying to set up a buildroot image for a soekris net4801.  I ran
> make menuconfig, Target Architecture is set to "i386", Target
> Architecture Variant is set to "geode".
> 
> However, when I run "make", I get the following
> (cd /home/wpettersson/src/buildroot/build_/linux-2.6.21.5 ; \
>          /usr/bin/make -j1 ARCH= CC="/usr/bin/gcc" \
> 
> INSTALL_HDR_PATH=/home/wpettersson/src/buildroot/toolchain_build_/linux
> headers_install ; \
>         )
> make[1]: Entering directory
> `/home/wpettersson/src/buildroot/build_/linux-2.6.21.5'
> Makefile:491:
> /home/wpettersson/src/buildroot/build_/linux-2.6.21.5/arch//Makefile: No
> such file or directory
> make[1]: *** No rule to make target
> `/home/wpettersson/src/buildroot/build_/linux-2.6.21.5/arch//Makefile'.
>  Stop.
> make[1]: Leaving directory
> `/home/wpettersson/src/buildroot/build_/linux-2.6.21.5'
> make: ***
> [/home/wpettersson/src/buildroot/toolchain_build_/linux/.configured] Error 2
> 
> From the looks of it, "ARCH" isn't being set, which stuffs things up.
> I've tested by running the make command manually, with ARCH=i386, and
> that seemed to work.
> 
> I wasn't sure which configuration files would be required, so to save
> space I didn't include any.  If any are wanted, I'll gladly post them.
> 
> Anyone know where ARCH is meant to be set?

Ok, I've investigated some more.  If the Target Architecture Variant is
set to "i386", I get the following

wpettersson ~/buildroot/package/config/buildroot-config $ grep i386 *
auto.conf:BR2_i386=y
auto.conf:BR2_ARCH="i386"
auto.conf:BR2_x86_i386=y
auto.conf:BR2_GCC_TARGET_ARCH="i386"
auto.conf:BR2_GCC_TARGET_TUNE="i386"
autoconf.h:#define BR2_i386 1
autoconf.h:#define BR2_ARCH "i386"
autoconf.h:#define BR2_x86_i386 1
autoconf.h:#define BR2_GCC_TARGET_ARCH "i386"
autoconf.h:#define BR2_GCC_TARGET_TUNE "i386"

However, if I set Target Architecture Variant to "geode", I get
wpettersson ~/buildroot/package/config/buildroot-config $ grep geode *
auto.conf:BR2_x86_geode=y
auto.conf:BR2_GCC_TARGET_ARCH="geode"
auto.conf:BR2_GCC_TARGET_TUNE="geode"
autoconf.h:#define BR2_x86_geode 1
autoconf.h:#define BR2_GCC_TARGET_ARCH "geode"
autoconf.h:#define BR2_GCC_TARGET_TUNE "geode"


So selecting "geode" means that BR2_ARCH doesn't get set.  I'm still
trying to dig through the code, but am I heading in the right direction
with this?


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