It sounds like a compiler branch, but I am not sure.
I am trying to build it on Ubuntu 10.04.
$ gcc -v
Using built-in specs.
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.4.3-4ubuntu5' --with-bugurl=file:///usr/share/doc/gcc-4.4/README.Bugs --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --enable-shared --enable-multiarch --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.4 --program-suffix=-4.4 --enable-nls --enable-clocale=gnu --enable-libstdcxx-debug --enable-plugin --enable-objc-gc --disable-werror --with-arch-32=i486 --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.4.3 (Ubuntu 4.4.3-4ubuntu5)
$ tup upd
[ tup ] Scanning filesystem...0.333s
[ tup ] No tup.config changes.
[ tup ] No Tupfiles to parse.
[ tup ] No files to delete.
[ tup ] Executing Commands...
[ 1/4085 ] gcc/gcc: CC _ashldi3.c
:0: internal compiler error: in ten_to_ptwo, at real.c:2182
Please submit a full bug report,
with preprocessed source if appropriate.
See http://gittup.org for instructions.
*** tup errors ***
*** Command ID=62683 failed with return value 1
[ 2/4085 ] gcc/gcc: CC _ashrdi3.c
:0: internal compiler error: in ten_to_ptwo, at real.c:2182
Please submit a full bug report,
with preprocessed source if appropriate.
See http://gittup.org for instructions.
*** tup errors ***
*** Command ID=62685 failed with return value 1
[ 3/4085 ] gcc/gcc: CC _subvsi3.c
:0: internal compiler error: in ten_to_ptwo, at real.c:2182
Please submit a full bug report,
with preprocessed source if appropriate.
See http://gittup.org for instructions.
*** tup errors ***
*** Command ID=62707 failed with return value 1
[ 4/4085 ] gcc/gcc: CC _lshrdi3.c
:0: internal compiler error: in ten_to_ptwo, at real.c:2182
Please submit a full bug report,
with preprocessed source if appropriate.
See http://gittup.org for instructions.
*** tup errors ***
*** Command ID=62681 failed with return value 1
[ 5/4085 ] gcc/gcc: CC _absvdi2.c
:0: internal compiler error: in ten_to_ptwo, at real.c:2182
Please submit a full bug report,
with preprocessed source if appropriate.
See http://gittup.org for instructions.
*** tup errors ***
*** Command ID=62701 failed with return value 1
[ 6/4085 ] gcc/gcc: CC _absvsi2.c
:0: internal compiler error: in ten_to_ptwo, at real.c:2182
Please submit a full bug report,
with preprocessed source if appropriate.
See http://gittup.org for instructions.
*** tup errors ***
*** Command ID=62699 failed with return value 1
[ 7/4085 ] gcc/gcc: CC __main.c
:0: internal compiler error: in ten_to_ptwo, at real.c:2182
Please submit a full bug report,
with preprocessed source if appropriate.
See http://gittup.org for instructions.
*** tup errors ***
*** Command ID=62697 failed with return value 1
[ 8/4085 ] gcc/gcc: CC _clear_cache.c
Please submit a full bug report,
with preprocessed source if appropriate.
See http://gittup.org for instructions.
*** tup errors ***
*** Command ID=62691 failed with return value 1
[ 9/4085 ] gcc/gcc: CC _muldi3.c
:0: internal compiler error: in ten_to_ptwo, at real.c:2182
Please submit a full bug report,
with preprocessed source if appropriate.
See http://gittup.org for instructions.
*** tup errors ***
*** Command ID=62677 failed with return value 1
[ 10/4085 ] gcc/gcc: CC _trampoline.c
:0: internal compiler error: in ten_to_ptwo, at real.c:2182
Please submit a full bug report,
with preprocessed source if appropriate.
See http://gittup.org for instructions.
*** tup errors ***
*** Command ID=62695 failed with return value 1
[ 11/4085 ] gcc/gcc: CC _addvsi3.c
:0: internal compiler error: in ten_to_ptwo, at real.c:2182
Please submit a full bug report,
with preprocessed source if appropriate.
See http://gittup.org for instructions.
*** tup errors ***
*** Command ID=62703 failed with return value 1
[ 12/4085 ] gcc/gcc: CC _cmpdi2.c
:0: internal compiler error: in ten_to_ptwo, at real.c:2182
Please submit a full bug report,
with preprocessed source if appropriate.
See http://gittup.org for instructions.
*** tup errors ***
*** Command ID=62687 failed with return value 1
[ 13/4085 ] gcc/gcc: CC _negdi2.c
:0: internal compiler error: in ten_to_ptwo, at real.c:2182
Please submit a full bug report,
with preprocessed source if appropriate.
See http://gittup.org for instructions.
*** tup errors ***
*** Command ID=62679 failed with return value 1
[ 14/4085 ] gcc/gcc: CC _enable_execute_stack.c
:0: internal compiler error: in ten_to_ptwo, at real.c:2182
Please submit a full bug report,
with preprocessed source if appropriate.
See http://gittup.org for instructions.
*** tup errors ***
*** Command ID=62693 failed with return value 1
[ 15/4085 ] gcc/gcc: CC _ucmpdi2.c
:0: internal compiler error: in ten_to_ptwo, at real.c:2182
Please submit a full bug report,
with preprocessed source if appropriate.
See http://gittup.org for instructions.
*** tup errors ***
*** Command ID=62689 failed with return value 1
[ 16/4085 ] gcc/gcc: CC _addvdi3.c
:0: internal compiler error: in ten_to_ptwo, at real.c:2182
Please submit a full bug report,
with preprocessed source if appropriate.
See http://gittup.org for instructions.
*** tup errors ***
*** Command ID=62705 failed with return value 1