Found out my error, I need to build phobos
with -unittest enabled in order to run them...
(default rule says -release, which skips them)

cd phobos
make DFLAGS="-Os -pipe -funittest -nostdinc" \
     libphobos.a unittest
./unittest

(where "-Os -pipe" are my normal build flags for gdc)
Built on my Mac with a patched gcc 3.3.5 and gdc 0.8:
http://svn.kuehne.cn/dstress/raw_results/mac-OS-X-10.3.6_gdc-0.8-patch/


So now I get the "expected" failure from the unittest run:
> Error: AssertError Failure ../gcc/d/phobos/std/math.d(576)
Due to it assuming that a real is 80 bits, but it's only 64.


But the documentation should probably mention that
you need to build phobos with the -unittest D flag ?

http://home.earthlink.net/~dvdfrdmn/d/INSTALL.html

--anders