[fpc-devel] Re: Porting FPC to IBM zArch

[Mark Morgan Lloyd]

Hans-Peter Diettrich wrote:
> Mark Morgan Lloyd schrieb:
> 
>> Apropos Paul's comments of doing a good cross-reference and handling 
>> compiler directives, I think the thing that is likely to give real 
>> problems is the {$if defined() } form...
> 
> I'm not sure whether $if defined() works with ordinary constants. The 
> $DEFINE and CONST identifiers most probably reside in different lists.
> 
>> const   a= 1;
>>
>> var     b: integer;
>>
>> begin
>> {$if defined(a) }
> This should work better:
>  {$if a=1 }

I think you're right, but your correction doesn't detract from the point 
that it is a slightly awkward "crossover case" where it is necessary to 
do more than simply parse {$ (and, for most cases, (*$ ) lines. I can 
only think of one other compiler implementation which did this sort of 
thing, and that was TopSpeed/JPI.

-- 
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk

[Opinions above are the author's, not those of his employers or colleagues]