trunk 20061003, works with 4.1 20060929, seen with glibc 2.3.6, 2.4, 2.5
gcc is configured with --with-system-libunwind

  Matthias

$ gcc -nostdlib -nostartfiles -static -o /home/packages/glibc/glibc-2.5/build-tree/ia64-libc/elf/sln    /home/packages/glibc/glibc-2.5/build-tree/ia64-libc/csu/crt1.o /home/packages/glibc/glibc-2.5/build-tree/ia64-libc/csu/crti.o `/usr/lib/gcc-snapshot/bin/gcc --print-file-name=crtbegin.o` /home/packages/glibc/glibc-2.5/build-tree/ia64-libc/elf/sln.o  /home/packages/glibc/glibc-2.5/build-tree/ia64-libc/libc.a -lgcc -lgcc_eh -lunwind /home/packages/glibc/glibc-2.5/build-tree/ia64-libc/libc.a `/usr/lib/gcc-snapshot/bin/gcc --print-file-name=crtend.o` /home/packages/glibc/glibc-2.5/build-tree/ia64-libc/csu/crtn.o
/usr/lib/gcc-snapshot/lib/gcc/ia64-linux-gnu/4.2.0/libgcc_eh.a(unwind-c.o): In function `__gcc_personality_v0':
(.text+0x822): undefined reference to `_Unwind_GetIPInfo'
collect2: ld returned 1 exit status
make[3]: *** [/home/packages/glibc/glibc-2.5/build-tree/ia64-libc/elf/sln] Error 1
make[3]: Leaving directory `/home/packages/glibc/glibc-2.5/build-tree/glibc-2.5/elf'
make[2]: *** [elf/others] Error 2