[fpc-pascal] si_prc.pp or prt0.as(m)?

[Marco van de Voort]

In our previous episode, leledumbo said:
> Both files define _start symbol. Which one is actually used? Is it possible
> to use only ptr0.as(m)?

This afaik depends on the OS. Linux uses si_pr*, and FreeBSD uses (c)prt0.as

OS X afaik has parts that are equivalent to stuff in si_pr* integrated in
the main program.