gcc builtin_malloc not supported

why is gcc's builtin_malloc not supported?

Why should it be supported? What are the advantages?

Why should it be supported? What are the advantages?

compatibility with gcc?

As I wrote earlier, because it doesn't make sense. It's a library
function. It will get almost always lowered to the library function and
in the few situation where the compiler can prove different, it is no
different from using alloca.

Joerg