For compatibility with the Compaq C compiler, the following pragma is supported.
This pragma renames all subsequent function and variable declarations
such that string is prepended to the name. This effect may be
terminated by using another
extern_prefix pragma with the
This pragma is similar in intent to to the asm labels extension
(see Asm Labels) in that the system programmer wants to change
the assembly-level ABI without changing the source-level API. The
__EXTERN_PREFIX if the pragma is available.