How to demangle pgCC names

To diagnose the following IPA problem (pgCC 11.9 on Linux):
The following function(s) are called, but no IPA information is available:
I need to demangle the above routine name and the missing routine names from the linker. I’m using a custom STL allocator and I suspect I forgot a function member somewhere (btw, my allocator compiles under gcc and VC++).
c++filt does nothing (tried all options).
Thanks for your help!

Answering my own question:
mangled name

(I was trying to use it from command line…)