Re: [Nasm-devel] Re: [Nasm-users] multisection example...

[anonymous c. <nas...@ya...>]

Frank,
> > section mysection
> > mysectionsize equ $ - section.mysection.start
> > 
> > This will tell me section.mysection.start wasn't defined prior to its use...
> > 
> > What's wrong?
> 
> Dunno. I can confirm that it happens. I *think* you're doing everything 
> right. If I add the "-O" switch, the error message changes to "invalid 
> operand type". I suspect a bug. I'll pass this on to the developer's 
> list, and see if anyone has any ideas...

The section.<name>.start label is defined by bin_define_section_labels()
in outbin.c. However, that function isn't called until after the second
pass has been completed -- see line 1227.

As a result, with the traditional two passes, EQU can't find the label
during the first pass. And since EQU's operand is a critical expression
you get the "symbol `<name>` not defined before use" error.

With additional passes you get the "invalid operand type" warning; it
happens to be the first of the two in parser.c, in line 690.


		
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