Clang and ports

[Joshua Isom]

I know that build cluster lists some ports that have problems with 
clang, but it doesn't say if they're tested or not.  I set up a clang 
jail to test out things before switching to clang for general use.  When 
I try running mencoder to encode a file to x264, it seg faults. 
Changing options doesn't change anything.  A gdb backtrace points to 
x264 being the problem.  Everything compiles and installs, but the 
build's useless.  Is clang ready for ports, or is it only safe for 
kernel/world?