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gcc trunk 20070110 build failure (--enable-targets=all i486-linux-gnu)

trunk configured on i486 (on x86_64 hardware) with

  --enable-targets=all i486-linux-gnu

fails to configure the first 64bit library (libiberty), not finding
the correct libgcc.

/scratch/packages/gcc/snap/gcc-snapshot-20070110/build/i486-linux-gnu/64/libiberty$ /scratch/packages/gcc/snap/gcc-snapshot-20070110/build/./gcc/xgcc -B/scratch/packages/gcc/snap/gcc-snapshot-20070110/build/./gcc/ -B/usr/lib/gcc-snapshot/i486-linux-gnu/bin/ -B/usr/lib/gcc-snapshot/i486-linux-gnu/lib/ -isystem /usr/lib/gcc-snapshot/i486-linux-gnu/include -isystem /usr/lib/gcc-snapshot/i486-linux-gnu/sys-include -m64 -o conftest -O2 -g -O2 foo.c   
/usr/bin/ld: skipping incompatible /scratch/packages/gcc/snap/gcc-snapshot-20070110/build/./gcc/libgcc.a when searching for -lgcc
/usr/bin/ld: cannot find -lgcc
collect2: ld returned 1 exit status

$ ls build/i486-linux-gnu/64

$ ls build/gcc/64
ls: build/gcc/64: No such file or directory

so the 64bit libgcc doesn't seem to be built and the multilib directory not created.

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