Wednesday January 30, 2008 The latest released version of Boost 1.34.1 can be compiled under 32-bit mode by Sun Studio 12 from scratch without necessity to apply any additional patches.
If you want to use Boost 1.34.1 under 64-bit mode you still have to apply a small fix to Boost build script.
Upcoming Boost 1.35 can be compiled by Sun Studio 12 under both 32/64-bit mode without any patches.
bjam toolset=sun stdlib=sun-stlport stage # 32-bit mode bjam toolset=sun stdlib=sun-stlport address-model=64 stage # 64-bit mode
As for advantages over Studio 11 and/or gcc: