I wonder how long it takes to compile on an RPi. I tried it once with the full Qt build and gave up :) Of course, I should have cross-compiled but I guess I didn't want it enough.
The impressive thing is that the build instructions are like 3 lines long, and actually result in a working build. No drama, no specific compiler versions required, no CMake or autotools or other external crap, no dependency hell... just lots of cl.exe invocations scrolling by, followed by a command prompt.
I think people working on cross compilation are wasting their time. They are trying to fix it "properly", separating build time dependency and run time dependency, because host system can't run cross compiled target binary. The obvious solution (what Scratchbox2 does) is for host system to run cross compiled target binary, instead of trying to "fix" the build system.
Especially since many ARM platforms are stuck on old libcs that are difficult to support.