Optimize a specific function

First of all, I'm not sure if this is the right place to ask this question so
please point me another place if it isn't.

It seems that clang doesn't support GCC's syntax for optimizing a specific
function. For example:

void __attribute__((optimize("omit-frame-pointer"))) foo() {}

Will this ever be supported or is there another way in clang to accomplish the
same?

Job