[fpc-pascal] support for FreeBSD4 broken in fpc 2.0.4

[Marco van de Voort]

> I haven't noticed up to now, but using fpc-2.0.4 on FreeBSD does not
> work completely in FreeBSD 4.11 any more.

This is by design. The default changed from FreeBSD4 to FreeBSD5 here.

The meaning of the compat switch -Xf changed accordingly afaik.

> - Compiling fpc 2.0.4 works.
> - Compiling programs does not work with the new startup
>   code (rtl/freebsd/i386/cprto.as)
>   error: failure in _init_tls()
>   couldn't find info on what that is ...

initialise the 5.x TLS supporting threading libs.
 
> - ... but multitasking isn't possible, the old cprt0.as
>   does not work with threads at all
>   errors:

Make sure nothing defines FreeBSD5, and use -Xd.
 
> Is there any chance of having support for FreeBSD 4 integrated into
> newer compilers?

Afaik, all support is still there, except maybe the startup code. Just make
sure that FreeBSD
 
> If the difference in initializing threads between 2.0.2 and 2.0.4 would
> be put into makefiles or ifdef's I think it could work ... but my
> knowledge of compiler internals and startup code is very limited.

This difference is twofold:
- startup codee, which you "fixed" (some diffing between the two would also
help.
- -Xf which changes to the "non-default" FreeBSD version on both 2.0.2 (where it
switches to 5.x) and 2.0.4(where it tries 4.x behaviour).