[Buildroot] -m32 cross compile builds with 64 bit kernel

[Mathew Benson]

I'm trying to cross compile 32 bit code with the -m32 switch for a 64 bit
kernel that I created with buildroot.  My steps are:

1.  Built a 32 bit ("output_32") and a 64 bit ("output") kernel and sysroot
2.  Copied "output_32/host/usr/x86_64-buildroot-linux-gnu/sysroot/lib/" to
"output/host/usr/x86_64-buildroot-linux-gnu/sysroot/lib32/"
3.  Copied "output_32/host/usr/x86_64-buildroot-linux-gnu/sysroot/usr/lib/"
to "output/host/usr/x86_64-buildroot-linux-gnu/sysroot/usr/lib32/"
4.  Set my build tools to "output/host/usr/bin/i686-pc-linux-gnu-"
5.  Added "output/host/usr/x86_64-buildroot-linux-gnu/sysroot/lib32/" and
"output/host/usr/x86_64-buildroot-linux-gnu/sysroot/usrlib32/" to my
library search path.

Everything compiles and most of the libraries are found and linked in, but
why do I get the following error:

/home/orion/i5/buildroot/output/host/opt/ext-toolchain/bin/../lib/gcc/i686-pc-linux-gnu/4.7.2/../../../../i686-pc-linux-gnu/bin/ld:
skipping incompatible
/home/orion/i5/buildroot/output/host/usr/x86_64-buildroot-linux-gnu/sysroot/lib/libc.so.6
when searching for /lib/libc.so.6
/home/orion/i5/buildroot/output/host/opt/ext-toolchain/bin/../lib/gcc/i686-pc-linux-gnu/4.7.2/../../../../i686-pc-linux-gnu/bin/ld:
cannot find /lib/libc.so.6 inside
/home/orion/i5/buildroot/output/host/usr/x86_64-buildroot-linux-gnu/sysroot
/home/orion/i5/buildroot/output/host/opt/ext-toolchain/bin/../lib/gcc/i686-pc-linux-gnu/4.7.2/../../../../i686-pc-linux-gnu/bin/ld:
skipping incompatible
/home/orion/i5/buildroot/output/host/usr/x86_64-buildroot-linux-gnu/sysroot/usr/lib/libc_nonshared.a
when searching for /usr/lib/libc_nonshared.a
/home/orion/i5/buildroot/output/host/opt/ext-toolchain/bin/../lib/gcc/i686-pc-linux-gnu/4.7.2/../../../../i686-pc-linux-gnu/bin/ld:
cannot find /usr/lib/libc_nonshared.a inside
/home/orion/i5/buildroot/output/host/usr/x86_64-buildroot-linux-gnu/sysroot
/home/orion/i5/buildroot/output/host/opt/ext-toolchain/bin/../lib/gcc/i686-pc-linux-gnu/4.7.2/../../../../i686-pc-linux-gnu/bin/ld:
cannot find /lib/ld-linux.so.2 inside
/home/orion/i5/buildroot/output/host/usr/x86_64-buildroot-linux-gnu/sysroot
collect2: error: ld returned 1 exit status
make[2]: *** [cf/apps/core-bin] Error 1
make[1]: *** [cfe/CMakeFiles/core-bin.dir/all] Error 2
make: *** [all] Error 2
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