[fpc-pascal] fpc trunk issue with StreamIO or TMemoryStream

[Michael Van Canneyt]

On Mon, 7 Oct 2019, Luca Olivetti wrote:

> El 7/10/19 a les 15:18, Michael Van Canneyt ha escrit:
>> 
>> 
>> On Mon, 7 Oct 2019, Luca Olivetti wrote:
>> 
>>> I'm facing a strange issue, I don't know if it's StreamIO or 
>>> TMemoryStream. The following program, compiled with fpc
>>>
>>> Free Pascal Compiler version 3.2.0-beta [2019/04/26] for i386
>>>
>>> (I checked trunk and I don't see changes in streams or streamio)
>> 
>> I tested your program with trunk, and it works OK.
>
> Thank you for testing, maybe it's time to upgrade the compiler.
> Per chance, do you know what could possibly have changed to fix the issue?
> I'm using svn revision 41937 and I had a quick look at the changes in 
> the repo, the only thing that caught my eyes is the ";overload;" added 
> to the Read/Write methods of THandleStream/TCustomMemoryString/TMemoryString

Well, lots of things changed in trunk regarding stream handling (Delphi
comapatibility) but these things were not merged to 3.2, since they require
compiler changes, and these changes were also not merged to 3.2, since
they're quite invasive.

The 'overload' just means that the compiler will not stop searching in the
current class but will consider parent classes as well. This should not
change the behaviour in case the stream variable is declared as TSTream.
(as should be the case inside assignstream)

Michael.