crosstool: problem building ppc64 toolchain w/ ppc64 kernel, ppc32userspace

[Roland Dreier <roland at topspin dot com>]

I'm trying to use crosstool to build a gcc-3.4.1/glibc-2.3.2 toolchain
with ppc64 target hosted on ppc32 (specifically, an IBM pSeries
machine running a ppc64 kernel but Debian sarge ppc32 userspace).
I've successfully built a ppc64 toolchain on i386, but on ppc32, the
build fails with:

    checking size of long double... configure: error: cannot compute sizeof (long double), 77

config.log shows:

    configure:6305: powerpc64-unknown-linux-gnu-gcc  -o conftest -O   conftest.c  >&5
    /usr/local/crosstool/ppc64/powerpc64-unknown-linux-gnu/gcc-3.4.1-glibc-2.3.2/lib/gcc/powerpc64-unknown-linux-gnu/3.4.1/../../../../powerpc64-unknown-linux-gnu/bin/ld: crt1.o: No such file: No such file or directory

Possibly the problem is that in this environment (with a 64-bit
kernel), uname gives ppc64:

     $ uname -m
     ppc64

so that configure thinks it's not cross-compiling:

    + /usr/local/crosstool/crosstool-0.28-rc32/build/powerpc64-unknown-linux-gnu/gcc-3.4.1-glibc-2.3.2/glibc-2.3.2/configure --prefix=/usr --build=powerpc64-unknown-linux-gnu --host=powerpc64-unknown-linux-gnu --without-tls --without-__thread --enable-kernel=2.4.3 --without-cvs --disable-profile --disable-debug --without-gd --enable-shared --enable-add-ons --with-headers=/usr/local/crosstool/ppc64/powerpc64-unknown-linux-gnu/gcc-3.4.1-glibc-2.3.2/powerpc64-unknown-linux-gnu/sys-root/usr/include
    checking build system type... powerpc64-unknown-linux-gnu
    checking host system type... powerpc64-unknown-linux-gnu

Any ideas on what the correct fix should be?

Thanks,
  Roland

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