-pie is broken on hppa

Hi,
I discovered that the breakage of portmap on hppa is related to the
-pie linkage.
Every program linked with the -pie option segfaults at start.
Unfortunately, portmap is unconditionnaly built with this option.
I suspect nscd is in the same case.

How can I go further in investigation ?
I would like to identify the responsible component between the toolchain 
and the glibc.

Any hint is welcome.