intermediate target for profiledbootstrap?

[Matt]

Is there a target that would allow me to use the profile-generating 
gcc/libstdc++ to compile arbitrary code, and then continue the 
profiledbootstrap, so as to speed up GCC for a specific codebase?

Also, is it possible to get a profile-optimized crosscompiler?

This was something I looked into while working for a large client in 2008, 
but maybe someone has done work in this area since then?

I would settle for being able to specify a testsuite whose compilation and 
runtime would seed the profie, like C++11, as just doing a 
profiledbootstrap with-CXX, while showing an improvement on compiling a 
C++ codebase, isn't giving the boost I was hoping for.

--
tangled strands of DNA explain the way that I behave.
http://www.clock.org/~matt