> My question is should the function, lets use isinf() for this example,
> be renamed _isinf() and stay in isinf.c, while the indirect symbol
> mapping is put in _isinf.c.  Or should isinf.c be moved to _isinf.c,
> isinf() renamed to _isinf(), and the indirect symbol mapping put in
> isinf.c; with the second, the filenames match the functions inside
> them.  Or does anyone have any better sugesstions?

Or compile them twice, changing a global define.  Something like

#ifdef  _EXTERNAL_
asm("   isinf .equ _isinf");    /* add more leading _ to taste */
#else

#  ifdef  _INTERNAL_
#  define isinf _isinf
#  endif

isinf(x)
	...
{
	..
}
#endif

Okay, compile them one more time than they are already compiled!