-flto / -flto-partition=none question on ia64-hp-hpux11.23

[Steve Ellcey <sje at cup dot hp dot com>]

I am looking at an lto bug on ia64-hp-hpux11.23.  If I compile
g++.dg/torture/pr33572.C with -flto on this platform I get:

ld: Unsatisfied symbol "__gcc_personality_v0" in file /var/tmp//ccYlpGzO.ltrans0.ltrans.o
1 errors.
collect2: ld returned 1 exit status

(This is using the HP linker which I do for all my GCC builds.)

If I add -flto-partition=none to the link, then everything works fine.
I notice that the =none option fo -flto-partition does not seem to be
documented in invoke.texi, which only covers 1to1 and balanced so I am
not sure what it means (put everything in one object?).

In both cases if I look at the output of the linker I see an undef of
__gcc_personality_v0 in the object file created by compiling pr33572.C
and a definition that should resolve that use in libstdc++.so.
libstdc++.so is searched in both cases and __gcc_personality_v0 is found
in both cases so I don't understand why I am getting the error in the
standard -flto case.

Does anyone have any ideas on what I should look at to understand this
problem?

I get this on a few other -flto programs, but not on all of them.

Steve Ellcey
sje@cup.hp.com