Le 09/06/2021 à 00:31, Martin Frb via fpc-devel a écrit :
I have the following issue.
A testcase (LazDebuggerFp/test) works fine. Except for 3.2.0 and 3.2.2 (win 64)
with -O3 or -O2
In detail:
- It works in 32 bit 3.2.2 -- O3
- It works in 64 bit 3.0.4 / 3.3.1 -- O1 O2 and O3 (My 3.3.1 is 2 weeks
old.)
- It works in 64 bit LINUX 3.2.2 -- O3
- It works in 64 bit 3.2.0 / 3.2.2 -- O1
- It works in 64 bit 3.2.2 -- O3 with {$implicitexceptions off} in several
units
* It does not work in 64bit 3.2.0 / 3.2.2 -O2 or O3 with default
{$implicitexceptions ON}
Yes, it could be a bug in my code, but at this point, my primary suspicion
points to a different origin for the trouble.
I could not find the faulty code yet. I suspect that it is a random memory
write (dangling pointer) that causes an error long after.
And given that I can't use valgrind....
So anyone can thing of any bug fixed (as it works with 3.3.1), that may not
have been merged?
I have not checked 3.2.1 yet. / Will be a while, I am away a couple of days.
Martin,
could you check if this relates to bug #38973?
https://bugs.freepascal.org/view.php?id=38973
This bug also does not show in current trunk.
If you get the same pattern of failures, it is most probably related to this
wrong optimization.
Pierre
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