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[fpGUI 2.0, Linux] Access violation at examples start #143

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[fpGUI 2.0, Linux] Access violation at examples start#143
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graemeg
Milestone
v2.0.1
@rchastain2

Description

@rchastain2
rchastain2
opened on Feb 10, 2026

Hello Graeme (and again thank you very much for that new version).

I don't know why I get a violation access when I start an example. (I tried with three examples.)

Here is how I compiled fpGUI:

$ pasbuild compile -p unix,agg
[INFO] PasBuild 1.2.0
[INFO] Copyright (c) 2025 by Graeme Geldenhuys

[INFO] Executing goal: reactor-compile
[INFO] Building 2 modules in dependency order
[INFO] Building module 1/2: fpgui-framework
[INFO] Executing goal: process-resources
[INFO] Processing resources from src/main/resources...
[INFO]   Filtering enabled
[INFO]   Filtered: languages/fpgui.zh_CN.po
[INFO]   Filtered: languages/fpgui.po
[INFO]   Filtered: languages/fpgui.he.po
[INFO]   Filtered: languages/fpgui.en.po
[INFO]   Filtered: languages/fpgui.pt_BR.po
[INFO]   Filtered: languages/fpgui.fr.po
[INFO]   Filtered: languages/fpgui.ms.po
[INFO]   Filtered: languages/fpgui.pt.po
[INFO]   Filtered: languages/fpgui.uk.po
[INFO]   Filtered: languages/fpgui.et.po
[INFO]   Filtered: languages/README.txt
[INFO]   Filtered: languages/fpgui.de.po
[INFO]   Filtered: languages/fpgui.it.po
[INFO]   Filtered: languages/fpgui.lo.po
[INFO]   Filtered: languages/fpgui.ru.po
[INFO]   Filtered: languages/fpgui.af.po
[INFO]   Filtered: languages/fpgui.pl.po
[INFO]   Filtered: languages/fpgui.es.po
[INFO]   Filtered: VERSION_FILE.inc
[INFO] Resources processed successfully
[INFO] Executing goal: compile
[INFO] Compiling project...
[INFO] Generating bootstrap program for library...
[INFO] Discovered 114 units
[INFO] Bootstrap program generated: target/bootstrap_program.pas
[INFO] Found 266 source file(s)
[INFO] Found 64 include file(s)
[INFO] Activating profile: unix
[INFO] Activating profile: agg
[DEBUG] user defined UnitPath: corelib/x11
[DEBUG] user defined UnitPath: corelib/render/software
[INFO] Build successful (see target/pasbuild-status/compile/fpc.log for details)
[INFO] Module build successful: fpgui-framework
[INFO] Building module 2/2: uidesigner
[INFO] Executing goal: process-resources
[INFO] Processing resources from src/main/resources...
[INFO]   Copied: uidesigner.desktop
[INFO]   Copied: icon_16.png
[INFO]   Copied: uidesigner.exe.manifest
[INFO]   Copied: icon_32.png
[INFO]   Copied: images/tabsheet.bmp
[INFO]   Copied: images/radiobutton.bmp
[INFO]   Copied: images/stringgrid.bmp
[INFO]   Copied: images/gauge.bmp
[INFO]   Copied: images/newform_16.bmp
[INFO]   Copied: images/groupbox.bmp
[INFO]   Copied: images/checkdateedit.bmp
[INFO]   Copied: images/shape_align_top.bmp
[INFO]   Copied: images/treeview.bmp
[INFO]   Copied: images/shape_align_left.bmp
[INFO]   Copied: images/listview.bmp
[INFO]   Copied: images/splitter.bmp
[INFO]   Copied: images/dateedit.bmp
[INFO]   Copied: images/editdirectory.bmp
[INFO]   Copied: images/valuebar.bmp
[INFO]   Copied: images/trackbar.bmp
[INFO]   Copied: images/pagecontrol.bmp
[INFO]   Copied: images/editcurrency.bmp
[INFO]   Copied: images/colorlistbox.bmp
[INFO]   Copied: images/editbutton.bmp
[INFO]   Copied: images/colorwheel.bmp
[INFO]   Copied: images/hyperlink.bmp
[INFO]   Copied: images/tscrollbox.png
[INFO]   Copied: images/editinteger.bmp
[INFO]   Copied: images/menubar.bmp
[INFO]   Copied: images/progressbar.bmp
[INFO]   Copied: images/ledmatrix.bmp
[INFO]   Copied: images/editfont.bmp
[INFO]   Copied: images/editfloat.bmp
[INFO]   Copied: images/editfilename.bmp
[INFO]   Copied: images/shape_align_right.bmp
[INFO]   Copied: images/scrollframe.bmp
[INFO]   Copied: images/toggle.bmp
[INFO]   Copied: images/richtextview.bmp
[INFO]   Copied: images/listbox.bmp
[INFO]   Copied: images/shape_align_bottom.bmp
[INFO]   Copied: languages/uidesigner.en.po
[INFO]   Copied: languages/uidesigner.pl.po
[INFO]   Copied: languages/uidesigner.po
[INFO]   Copied: languages/uidesigner.ms.po
[INFO]   Copied: languages/uidesigner.pt.po
[INFO]   Copied: languages/uidesigner.et.po
[INFO]   Copied: languages/uidesigner.uk.po
[INFO]   Copied: languages/uidesigner.pt_BR.po
[INFO]   Copied: languages/uidesigner.ru.po
[INFO]   Copied: languages/uidesigner.af.po
[INFO]   Copied: uidesigner.png
[INFO] Resources processed successfully
[INFO] Executing goal: compile
[INFO] Compiling project...
[INFO] Found 15 source file(s)
[INFO] Found 2 include file(s)
[WARNING] Profile not found: unix
[WARNING] Profile not found: agg
[INFO] Build successful (see target/pasbuild-status/compile/fpc.log for details)
[INFO] Module build successful: uidesigner
[INFO] Reactor build complete: 2/2 modules built

Here is how I compiled an example:

$ fpc @extrafpc.cfg aboutdialog.pp
Note: DWARF debug information cannot be used with smart linking on this target, switching to static linking
Free Pascal Compiler version 3.2.2 [2023/03/05] for x86_64
Copyright (c) 1993-2021 by Florian Klaempfl and others
Target OS: Linux for x86-64
Compiling aboutdialog.pp
Compiling fabout.pas
fabout.pas(122,29) Warning: Symbol "SetPosition" is deprecated: "Use Left, Top, Width, Height properties instead"
fabout.pas(134,30) Warning: Symbol "SetPosition" is deprecated: "Use Left, Top, Width, Height properties instead"
fabout.pas(147,30) Warning: Symbol "SetPosition" is deprecated: "Use Left, Top, Width, Height properties instead"
fabout.pas(159,30) Warning: Symbol "SetPosition" is deprecated: "Use Left, Top, Width, Height properties instead"
fabout.pas(171,31) Warning: Symbol "SetPosition" is deprecated: "Use Left, Top, Width, Height properties instead"
aboutdialog.pp(55,30) Warning: Symbol "SetPosition" is deprecated: "Use Left, Top, Width, Height properties instead"
aboutdialog.pp(61,32) Warning: Symbol "SetPosition" is deprecated: "Use Left, Top, Width, Height properties instead"
Linking aboutdialog
431 lines compiled, 3.1 sec
7 warning(s) issued
1 note(s) issued

Here is what happens when I launch the example:

$ ./aboutdialog
An unhandled exception occurred at $0000000000587A1E:
EAccessViolation: Access violation
  $0000000000587A1E  FONT_ENGINE_FREETYPE_BASE__DESTRUCT,  line 874 of src/main/pascal/corelib/render/software/agg_font_freetype.pas
  $000000000050E495  TFPGAGG2DFONTRESOURCE__DESTROY,  line 1325 of src/main/pascal/corelib/render/software/Agg2D.pas
  $000000000050E411  TFPGAGG2DFONTRESOURCE__CREATE,  line 1320 of src/main/pascal/corelib/render/software/Agg2D.pas
  $00000000004F0128  TFPGFONTMANAGER__GETFONT,  line 114 of src/main/pascal/corelib/fpg_fontmanager.pas
  $00000000004F02AA  TFPGFONTMANAGER__GETDEFAULTFONT,  line 150 of src/main/pascal/corelib/fpg_fontmanager.pas
  $00000000004F01E1  TFPGFONTMANAGER__GETFONT,  line 130 of src/main/pascal/corelib/fpg_fontmanager.pas
  $00000000004F02AA  TFPGFONTMANAGER__GETDEFAULTFONT,  line 150 of src/main/pascal/corelib/fpg_fontmanager.pas
  $00000000004F01E1  TFPGFONTMANAGER__GETFONT,  line 130 of src/main/pascal/corelib/fpg_fontmanager.pas
  $00000000004F02AA  TFPGFONTMANAGER__GETDEFAULTFONT,  line 150 of src/main/pascal/corelib/fpg_fontmanager.pas
  $00000000004F01E1  TFPGFONTMANAGER__GETFONT,  line 130 of src/main/pascal/corelib/fpg_fontmanager.pas
  $00000000004F02AA  TFPGFONTMANAGER__GETDEFAULTFONT,  line 150 of src/main/pascal/corelib/fpg_fontmanager.pas
  $00000000004F01E1  TFPGFONTMANAGER__GETFONT,  line 130 of src/main/pascal/corelib/fpg_fontmanager.pas
  $00000000004F02AA  TFPGFONTMANAGER__GETDEFAULTFONT,  line 150 of src/main/pascal/corelib/fpg_fontmanager.pas
  $00000000004F01E1  TFPGFONTMANAGER__GETFONT,  line 130 of src/main/pascal/corelib/fpg_fontmanager.pas
  $00000000004F02AA  TFPGFONTMANAGER__GETDEFAULTFONT,  line 150 of src/main/pascal/corelib/fpg_fontmanager.pas
  $00000000004F01E1  TFPGFONTMANAGER__GETFONT,  line 130 of src/main/pascal/corelib/fpg_fontmanager.pas
  $00000000004F02AA  TFPGFONTMANAGER__GETDEFAULTFONT,  line 150 of src/main/pascal/corelib/fpg_fontmanager.pas

Liberation Sans is installed:

$ fc-list
...
/usr/share/fonts/TTF/liberation/LiberationMono-BoldItalic.ttf: Liberation Mono:style=Bold Italic
/usr/share/fonts/TTF/liberation/LiberationMono-Bold.ttf: Liberation Mono:style=Bold
/usr/share/fonts/TTF/liberation/LiberationMono-Italic.ttf: Liberation Mono:style=Italic
/usr/share/fonts/TTF/liberation/LiberationMono-Regular.ttf: Liberation Mono:style=Regular
/usr/share/fonts/TTF/liberation/LiberationSans-BoldItalic.ttf: Liberation Sans:style=Bold Italic
/usr/share/fonts/TTF/liberation/LiberationSans-Bold.ttf: Liberation Sans:style=Bold
/usr/share/fonts/TTF/liberation/LiberationSans-Italic.ttf: Liberation Sans:style=Italic
/usr/share/fonts/TTF/liberation/LiberationSans-Regular.ttf: Liberation Sans:style=Regular
/usr/share/fonts/TTF/liberation/LiberationSerif-BoldItalic.ttf: Liberation Serif:style=Bold Italic
/usr/share/fonts/TTF/liberation/LiberationSerif-Bold.ttf: Liberation Serif:style=Bold
/usr/share/fonts/TTF/liberation/LiberationSerif-Italic.ttf: Liberation Serif:style=Italic
/usr/share/fonts/TTF/liberation/LiberationSerif-Regular.ttf: Liberation Serif:style=Regular

$ urpmq -i "fonts-ttf-liberation"
Name        : fonts-ttf-liberation
Version     : 2.1.5
Release     : 2.mga9
Group       : System/Fonts/True type
Size        : 4404378                      Architecture: noarch
Source RPM  : fonts-ttf-liberation-2.1.5-2.mga9.src.rpm
URL         : https://pagure.io/liberation-fonts/
Summary     : Fonts to replace commonly used Microsoft Windows Fonts
Description :
The Liberation Fonts are intended to be replacements for the three
most commonly used fonts on Microsoft systems: Times New Roman,
Arial, and Courier New.

Would you have an idea of what happens?

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