egcs-1.1 as of 980827 builds the tagged glibc just fine.
A word of warning though that the tagged glibc is not
fine on alpha.
After fixing the bugs in glibc (for those who care to try
a newer cvs version), all tests pass except for
* complex float (see complex-5),
* exp10 accuracy (which is currently implemented in terms
of exp, and so is not surprising).
r~