What is a plain stock compiler anyway? Certainly not gcc.
Linux already requires a specific version of a specific
compiler with a specific object file format. You simply
can't write kernel code with plain stock compilers.
There are 3 gcc variants that can support the kernel now.
If the FSF won't add some feature Linux needs, tough.
They _will_ add it if Linux stops using their gcc, just like
they made glibc work. They might not cooperate until they
start to lose control a bit. Oh well. It is sick to let
them hold Linux back.
Anyway, this is only for versioned modules.