Re: [avr-gcc-list] Using __tmp_reg__ etc in assembly file

[Colin Wall]

Georg-Johann Lay <address@hidden> wrote on 23/01/2009 01:06:01 p.m.:

> > 
> > So, from what I can see, the compiler makes these defines available to
> > C source, but not to asm (.S) source, and I need to repeat them myself
> > in the asm file to use them there.
> 
> No, these defines are not available in a C source. They are available in 

> a assembler .s source that is generated by the compiler.
> So you can use this in your inline asm.
> 
> If you like make you can make the assembler source(s) dependent on a 
> dummy header:
> 
> .INTERMEDIATE: asm-defines.h dummy.c
> 
> %.S: asm-defines.h
> 
> dummy.c:
>    touch $<
> 
> asm-defines.h: dummy.c
>    avr-gcc -mmcu=$(MCU_TARGET) -S $< -o $@
> 
> and include the generated header in your files
> 
> #include "asm-defines.h"
> 
> in order to be always in sync with the compiler and the target.
> 

Thanks Georg-Johan,
That explains it clearly, and your suggestion is just the kind of thing I
had been looking for.

Colin.



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