Enable all address sizes for CPU none

[pinobatch]

I sometimes use ca65 to write code in assembly language for an obscure CPU for which I do not want to write a whole assembler from scratch (example: #362). When I do this, I .setcpu "none" and implement every mnemonic as a ca65 macro.

However, I get Error: Range error when the assembler cannot statically prove that a particular value is less than $100. When I use .globalzp to assert that the value is less than $100, I get Warning: Symbol `memset_tiny' is absolute but exported zeropage. When I do .segment "LOWCODE0": zeropage to make a label not absolute, I get Error: Invalid address size specification for current CPU.

What would be the drawbacks of making all three address size specifications (zeropage, absolute, and far) valid for the none CPU?

[polluks]

This is the particular code

cc65/src/common/cpu.c

Line 98 in 153bb29

/* Not supported by None and Sweet16 */

[greg-king5]

I think that the original idea is that the none CPU has no instructions; therefore, it has no addressing modes. But, that makes it useless! I agree with you; we should go in the opposite direction. none should have no limits -- even "long" addresses should be allowed.

[oliverschmidt]

I fully agree. @greg-king5: Thanks for taking care.

[greg-king5]

Done: 2e5fbe8.