[fpc-devel] initialization order of units

J. Gareth Moreton gareth at moreton-family.com
Fri Oct 23 01:40:44 CEST 2020

This is just my personal opinion, but I do think that using 
"initialization" is risky if it uses anything outside of the unit, and 
hence you should minimise any inter-dependencies.  If I had to suggest a 
concrete workaround, it would be a initialisation routine that you call 
manually or as part of an object constructor, although it ends up 
requiring a bit more work for those who use the unit.

Sorry I can't be of much more help.

Gareth aka. Kit

On 22/10/2020 22:24, Florian Klämpfl via fpc-devel wrote:
> Am 22.10.20 um 23:04 schrieb Pascal Riekenberg via fpc-devel:
>>> Jonas Maebe via fpc-devel <fpc-devel at lists.freepascal.org> hat am 
>>> 22.10.2020 22:28 geschrieben:
>>>   On 22/10/2020 21:35, Pascal Riekenberg via fpc-devel wrote:
>>>> Have there been any changes to the initialization order of units in 
>>>> the
>>>> last 6 month?
>>>> I have a complex project with multiple units with initialization
>>>> section. And now
>>>> one of those units does not get initialized before it is used by the
>>>> initialization part of
>>>> an other unit. This worked at the beginning of the year!
>>> It might be caused the fix for
>>> https://bugs.freepascal.org/view.php?id=32352. Keep in mind that if
>>> there are uses-cycles via the implementation section, the 
>>> initialisation
>>> order of the involved units is undefined.
>> There it is again: my pet project: Why doesn't pascal allow circular 
>> unit references (at least for classes, like forwards)!
>> I like pascal very much but this is the biggest annoyance!
>> You always have to work around this (put multiple classes in one 
>> unit, create interface classes, ...). And now this:
>> I have such cycles, but it worked before.
>> I removed this cycles and it worked as expected.
>> Isn't there a way to force the order?
>> Why isn't it initialized first even if the unit is the first after 
>> Forms in the program?
>> If there are uses-cycles via the implementation section why doesn't
>> fpc prioritize interface order?
> Basically because of this:
> https://bugs.freepascal.org/view.php?id=32352#c118712
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