[fpc-pascal] Requirement of {$M+} to add RTTI info

[luiz americo pereira camara]

2012/12/12 Sven Barth <pascaldragon at googlemail.com>:
> Am 12.12.2012 01:15 schrieb "luiz americo pereira camara"
> <luizmed at oi.com.br>:
>
>
>>
>> Some time ago, i was getting an error while trying to use RTTI
>> functions in a class descending directly of TObject
>>
>> Later i discovered that i needed to descend from TPersistent due to
>> $M+ directive (http://www.freepascal.org/docs-html/prog/progsu44.html),
>> so i did.
>>
>> Now, i decided to go back and descend directly from TObject. To allow
>> RTTI usage i would put M+ around my own class
>>
>> I tested again and using RTTI functions (SetOrdProp, GetPropInfo)
>> worked even without declaring {$M+}
>
> Can you check whether your unit was really recompiled? Remove the .ppu and
> .o files for the unit to be on the save side.


I already did that

> Also it could be that the
> switch was declared somewhere before your class and not disabled again with
> {$M-}
>

Maybe. I also think of a compiler option being passed in Lazarus
package but could not find such option

>> So, is it really necessary to put $M+ to use RTTI?
>
> Yes.


Thanks. I 'll put M+ it anyway

Luiz