Permissive licensed toolchain

["C. Bergström"]

Hi

What's the real status of a fully permissive licensed toolchain?

1) Benchmarks - (I mean emperical evidence on FBSD and per target with 
no anecdotal comments or speculation.. I admit benchmarks can actually 
be misleading since many companies optimize for them specifically)
2) Has anyone tested clang++ with libc++ or stdcxx?  (In my tests I hit 
some build problems with Apache stdcxx)
3) Which assembler is being used?
4) Which linker is being used?

What's the best way to make a plan which will get feedback if someone 
wanted to try alternative approach to the above?


Thanks

./C