External: SIGSEGV
lazarus / 1-Linux

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RogerHJB · 2022-12-30 20:25

I am using Lazarus 2.2.4, FPC 3.2.2 on X86-64-linux-gtk2

Every time I try to change the caption on any object, I have tried
TEdit, TStaticText and TButton, I get a External: SIGSEGV.  I can
change the colour with no problem but if I try  other properties such
as top, width, left, etc, I get the same error.

Objects are located on a TForm.

Roger

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MarkMLl · 2022-12-30 21:22

I'm using the same, and don't see anything like that.

Are you doing something like trying to make the change from a
background thread without using Synchronize()?

Where did you get your FPC+Lazarus: the official repositories or from
whichever distro you're using?

Apart from that I think we really need to see a cut-down project that
we can run to try to duplicate the problem.

MarkMLl

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KodeZwerg · 2022-12-30 22:32

I had that problem once when I accidently f*cked up some rtl units
(importing a project overwrote my default unit path)

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Martin_fr · 2022-12-30 22:46

Start the ide from a terminal/console (use the command startlazarus)
=> see if it prints anything when the error happens (if lucky it will
print a stack trace)

Do a clean rebuild of the IDE.

Tools > Configure Build lazarus
Select the "clean all" radio
Build

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RogerHJB · 2022-12-31 21:06

Curious thing happened.  I created a test app and duplicated what I
had before and I don't get that problem in my test app.  I have
restarted my app and so far all seems Ok.  I must have done something
wrong the first time.

Thanks for your comments.

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RogerHJB · 2023-01-03 19:48

Further to the previous post, I got the same erroe again.  I think I
have found the problem.  I was using a dynamic array to hold the
pertinent information.  I found that if I commented out the code that
created the array, the error would go away.  I have now hard coded the
size of the array and no more error.  Not sure why this would cause a
problem but there it is.

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MarkMLl · 2023-01-03 20:31

Quote from: RogerHJB on January 03, 2023, 08:48:52 pmFurther to the
previous post, I got the same erroe again.  I think I have found the
problem.  I was using a dynamic array to hold the pertinent
information.  I found that if I commented out the code that created
the array, the error would go away.  I have now hard coded the size of
the array and no more error.  Not sure why this would cause a problem
but there it is.

Were you somewhere referring to the address of the dynamic array
rather than the address of its first element? The block that describes
a dynamic array is distinct from the block which defines its contents.

MarkMLl