byte-compile-file not reentrant?

[Lennart Borgman]

A buffer created with (get-buffer-create " *Compiler Input*") makes
byte-compile-file not reentrant if I understand it correctly. (I did
not look very carefully.)

I do not understand the meaning of this. Should the old buffer be
reused in some way?

There is a similar call in byte-compile-from-buffer.

Could perhaps these calls be changed to generate new buffer names?
Would that make byte compiling reentrant or are there other
restrictions that makes this impossible?