[fpc-devel] Different handling of try..except depending on OS?

Michael Van Canneyt michael at freepascal.org
Thu Dec 10 11:53:32 CET 2020

On Thu, 10 Dec 2020, Tomas Hajny via fpc-devel wrote:

> On 2020-12-10 07:34, Sven Barth via fpc-devel wrote:
>> Am 09.12.2020 um 23:45 schrieb Bart via fpc-devel:
>>> Compiled with fpc 3.2.0 on Windows it will output (both 32 and 64 
>>> bit):
>>> Runtime error 201 at $004015F1
>>>    $004015F1
>>>    $00407307
>>> Compiled with fpc 3.2.0 on linux X86_64 it will output
>>> Except block
>>> Finally block
>>> On Windows you need to include the sysutils unit to execute the except
>>> and finally block.
>> That is correct, because without the SysUtils unit (which declared the
>> Exception type) the RTL can't convert the triggered runtime error to
>> an exception type that can be caught inside the try ... except ... end
>> block.
>  .
>  .
> Is the current behaviour on "other" (non-MS Windows) targets really 
> correct (I checked under OS/2 for both 3.2.0 and trunk and it behaves 
> the same way as Linux)? Including SysUtils should result in converting a 
> run-time error to an exception. If SysUtils is not included, run-time 
> error should be raised regardless from the try..except block (as it does 
> under MS Windows, but not on other platforms at the moment), shouldn't 
> it? Shouldn't the try..except construct by default (i.e. without using 
> SysUtils) catch only explicitly raised exceptions?

Yes, it should. it's definitely a bug.


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