#asm/#endasm cannot be used in a macro

[Oleg-N-Cher]

Dear z88dk developers,
When working on zcc, I came across its difference from SDCC. In particular, zcc has constructs #asm/#endasm, whereas in SDCC they are designated __asm/__endasm

There is nothing wrong with this difference, but let's say I need to develop a macro that will implement a single machine command (for example, HALT). In SDCC I can wrote:

#define WAITSYNC __asm halt __endasm

And it will work.

Whereas, a similar macro containing a service symbol # will not work in zcc:

#define WAITSYNC #asm halt #endasm

Maybe I certainly do not understand something or have not studied the documentation well. In that case, correct me. However, if I am right, I would like to request such possibility. The simplest thing is to make the __asm/__endasm directives available in zcc as synonyms of #asm/#endasm.

Thank you.

[zx70]

I think this hint will work for your needs:

z88dk/include/stdlib.h

Line 270 in ae3a727

#define M_INP(port) asm("ld\tbc,"#port"\nin\tl,(c)\nld\th,0\n");

[suborb]

sdcc uses a bit of nasty "hack" to get __asm/__endasm to work in macros: #1268

Thankfully as Stefano pointed out there's an alternative which is using the asm("") function style invocation. Although the tree is using asm(), __asm__() works with both compilers. There's a multi-line example of the usage here: https://github.com/z88dk/z88dk/blob/master/include/_DEVELOPMENT/proto/im2.h#L23

[Oleg-N-Cher]

Thank you, guys. Yes, it will really help me.

Why is the \t symbol so widely used inside? Can there be a space? (this will be more visual).

[Oleg-N-Cher]

P.S. zcc doesn't compile this:

do{ __asm defb 12h __endasm; }while(0) ;

Bolder16K.c:75:20: fatal error: Unknown symbol: __asm
Compilation aborted

suborb, you wrote here (#1268 (comment)) that it must works for -compiler=sccz80

Where am I wrong? Or do I just need to update the z88dk?

[Oleg-N-Cher]

Please, answer: can I declare an aligned array in zcc?
SDCC allows such construction. but zcc looks like not.

unsigned char __at(0xFF00) Rsrc_field [256];

[suborb]

Please, answer: can I declare an aligned array in zcc?
SDCC allows such construction. but zcc looks like not.

unsigned char __at(0xFF00) Rsrc_field [256];

sccz80 is a bit picky about the order it seems, try moving the __at:

extern __at(0x4000) char x[200];

[Oleg-N-Cher]

Thank you very much for the useable hint, suborb.
I think I can close the issue.