Atari target for Calypsi 68k C compiler

[vinz6751]

Hello !

Håkan Thörngren has created the Calypsi cross-compiler tool chain https://www.calypsi.cc/. It targets the 68000 (and soon 68020+), 65816/6502 features a nice compiler, assembler and linker, and the documentation is really neat, check it out !
It allows coding PC-relative code, writing interrupt handlers etc.
This compiler is under active development and its primary target are the Foenix Retro System computers http://c256foenix.com.

Since this compiler is under active development, we can still provide feedback and influence its development. I asked Håkan if we could support producing Atari-compatible output (executable, DRI/GST ?), he said we would consider it if there is enough interest.

So please post here to manifest your interest ! Then we can come to Håkan and show it ! He also accepts donations so that might also be an incentive to get that job done He's really nice and very talented ; must be to have come up with a whole compiler toolchain by himself !
He also has his own room "ht313" in Foenix Retro Systems discord server https://discord.gg/2GB47Vjf if you want to follow the development.

Vinz/MPS

[shoggoth]

Awesome. Yeah, I think it would be really good to have some more compiler choices, seems very interesting.

[metalages]

A reason why i still compile with pure c is the fact the startup code is provided and it is easy to rewrite. In particular doing this allows to compile without any standard lib with limited overhead ( useful for demos )

[vinz6751]

In case you haven't seen, the Calypsi 5.1 compiler is out. There is a 68K simulator so you can test stuff on your native OS, the support of inline functions has been added. There is support for the 68020, and the assembler supports up to the 68060, and you get to choose the "by stack" calling convention of the default register-based calling convention.
Håkan Thörngren is doing an absolutely amazing job !
https://www.calypsi.cc/

I made some bindings for TOS here
https://github.com/vinz6751/Calypsi-for-TOS

[ThorstenOtto]

I made some bindings for TOS here
https://github.com/vinz6751/Calypsi-for-TOS

From what i've seen, the default calling convention for calypsi expects all registers except d0/d1/a0/a1 to be preserved, while calling any BIOS/XBIOS/GEMDOS function may clobber d2/a2. So you may have to preserve them in your bindings.
It also seem to support inline assembly similar to gcc, maybe that is more convenient for that purpose.

[vinz6751]

Very good remarks indeed, thank you!

[vinz6751]

I forgot to mention, Calypsi can generate TOS executables.