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digitalmars.D - Dlang with Dlangui not working on Debian12 (oldstable)

reply rnd2 <r_narang yahoo.com> writes:
The title says it all.
I am working on Debian12 which recently became OldStable from 
Stable.
I installed gdmd and dub from Debian repositories.
Hence I have following versions:

     $ dub --version
     DUB version 1.27.0-3, built on Aug 13 2022

     $ gdmd --version
     gdc (Debian 12.2.0-14+deb12u1) 12.2.0
     Copyright (C) 2022 Free Software Foundation, Inc.
     This is free software; see the source for copying conditions. 
  There is NO
     warranty; not even for MERCHANTABILITY or FITNESS FOR A 
PARTICULAR PURPOSE.
	

     $ ldc2 --version
     LDC - the LLVM D compiler (1.30.0):
       based on DMD v2.100.1 and LLVM 14.0.6
       built with LDC - the LLVM D compiler (1.30.0)
       Default target: x86_64-pc-linux-gnu
       Host CPU: ivybridge
       http://dlang.org - http://wiki.dlang.org/LDC


I tried to build some simple applications using Dlangui and gdmd 
or ldc2m but all failed.

One source code is as follows:

     import dlangui.platforms.sdl.sdlapp; // App, Window, Button, 
etc.
     import std.stdio;
     int main(string[] args)
     {
         auto app = new App(args);                     // <- App 
is from sdlapp.d
         auto win = app.createWindow("DlangUI SDL Test", 400, 300);
         auto btn = new Button("Click Me");           // <- Button 
is from sdlapp.d
         win.addChild(btn);
         // Button click handler must return bool
         btn.click = (widget) {
             writeln("Button clicked!");
             return true;
         };
         win.show();
         return app.run();
     }

And dub.json file is as follows:

     {
         "name": "mydlangui",
         "description": "Minimal DlangUI SDL application",
         "authors": ["cardio"],
         "license": "proprietary",
         "version": "0.0.1",
         "dependencies": {
             "dlangui": "~>0.10.8"
         }
     }

The error is as follows:

     $ dub build --compiler=ldc2
     Performing "debug" build using ldc2 for x86_64.
     arsd-official:characterencodings 10.9.10: target for 
configuration "library" is up to date.
     arsd-official:dom 10.9.10: target for configuration "library" 
is up to date.
     arsd-official:color_base 10.9.10: target for configuration 
"library" is up to date.
     arsd-official:bmp 10.9.10: target for configuration "library" 
is up to date.
     arsd-official:imageresize 10.9.10: target for configuration 
"library" is up to date.
     arsd-official:jpeg 10.9.10: target for configuration 
"library" is up to date.
     arsd-official:png 10.9.10: target for configuration "library" 
is up to date.
     arsd-official:svg 10.9.10: target for configuration "library" 
is up to date.
     arsd-official:image_files 10.9.10: target for configuration 
"library" is up to date.
     bindbc-common 0.1.6: target for configuration "noBC" is up to 
date.
     bindbc-loader 1.1.5: target for configuration "noBC" is up to 
date.
     bindbc-freetype 1.2.6: target for configuration "dynamic" is 
up to date.
     bindbc-opengl 1.1.1: target for configuration "dynamic" is up 
to date.
     bindbc-sdl 1.4.8: target for configuration "dynamic" is up to 
date.
     inilike 1.2.3: target for configuration "library" is up to 
date.
     isfreedesktop 0.1.1: target for configuration "library" is up 
to date.
     xdgpaths 0.2.5: target for configuration "library" is up to 
date.
     icontheme 1.2.3: target for configuration "library" is up to 
date.
     dlangui 0.10.8: target for configuration "default" is up to 
date.
     mydlangui 0.0.1: building configuration "application"...
     source/app.d(5,16): Error: undefined identifier `App`, did 
you mean module `app`?
     source/app.d(7,16): Error: undefined identifier `Button`
     ldc2 failed with exit code 1.


Where is the problem and how can it be solved? Thanks for your 
help.
Dec 01
parent GrimMaple <grimmaple95 gmail.com> writes:
On Monday, 1 December 2025 at 17:03:31 UTC, rnd2 wrote:

 The title says it all.
 I am working on Debian12 which recently became OldStable from 
 Stable.
 I installed gdmd and dub from Debian repositories.
 Hence I have following versions:

     $ dub --version
     DUB version 1.27.0-3, built on Aug 13 2022

     $ gdmd --version
     gdc (Debian 12.2.0-14+deb12u1) 12.2.0
     Copyright (C) 2022 Free Software Foundation, Inc.
     This is free software; see the source for copying 
 conditions.  There is NO
     warranty; not even for MERCHANTABILITY or FITNESS FOR A 
 PARTICULAR PURPOSE.
 	

     $ ldc2 --version
     LDC - the LLVM D compiler (1.30.0):
       based on DMD v2.100.1 and LLVM 14.0.6
       built with LDC - the LLVM D compiler (1.30.0)
       Default target: x86_64-pc-linux-gnu
       Host CPU: ivybridge
       http://dlang.org - http://wiki.dlang.org/LDC


 I tried to build some simple applications using Dlangui and 
 gdmd or ldc2m but all failed.

 One source code is as follows:

     import dlangui.platforms.sdl.sdlapp; // App, Window, 
 Button, etc.
     import std.stdio;
     int main(string[] args)
     {
         auto app = new App(args);                     // <- App 
 is from sdlapp.d
         auto win = app.createWindow("DlangUI SDL Test", 400, 
 300);
         auto btn = new Button("Click Me");           // <- 
 Button is from sdlapp.d
         win.addChild(btn);
         // Button click handler must return bool
         btn.click = (widget) {
             writeln("Button clicked!");
             return true;
         };
         win.show();
         return app.run();
     }

 And dub.json file is as follows:

     {
         "name": "mydlangui",
         "description": "Minimal DlangUI SDL application",
         "authors": ["cardio"],
         "license": "proprietary",
         "version": "0.0.1",
         "dependencies": {
             "dlangui": "~>0.10.8"
         }
     }

 The error is as follows:

     $ dub build --compiler=ldc2
     Performing "debug" build using ldc2 for x86_64.
     arsd-official:characterencodings 10.9.10: target for 
 configuration "library" is up to date.
     arsd-official:dom 10.9.10: target for configuration 
 "library" is up to date.
     arsd-official:color_base 10.9.10: target for configuration 
 "library" is up to date.
     arsd-official:bmp 10.9.10: target for configuration 
 "library" is up to date.
     arsd-official:imageresize 10.9.10: target for configuration 
 "library" is up to date.
     arsd-official:jpeg 10.9.10: target for configuration 
 "library" is up to date.
     arsd-official:png 10.9.10: target for configuration 
 "library" is up to date.
     arsd-official:svg 10.9.10: target for configuration 
 "library" is up to date.
     arsd-official:image_files 10.9.10: target for configuration 
 "library" is up to date.
     bindbc-common 0.1.6: target for configuration "noBC" is up 
 to date.
     bindbc-loader 1.1.5: target for configuration "noBC" is up 
 to date.
     bindbc-freetype 1.2.6: target for configuration "dynamic" 
 is up to date.
     bindbc-opengl 1.1.1: target for configuration "dynamic" is 
 up to date.
     bindbc-sdl 1.4.8: target for configuration "dynamic" is up 
 to date.
     inilike 1.2.3: target for configuration "library" is up to 
 date.
     isfreedesktop 0.1.1: target for configuration "library" is 
 up to date.
     xdgpaths 0.2.5: target for configuration "library" is up to 
 date.
     icontheme 1.2.3: target for configuration "library" is up 
 to date.
     dlangui 0.10.8: target for configuration "default" is up to 
 date.
     mydlangui 0.0.1: building configuration "application"...
     source/app.d(5,16): Error: undefined identifier `App`, did 
 you mean module `app`?
     source/app.d(7,16): Error: undefined identifier `Button`
     ldc2 failed with exit code 1.


 Where is the problem and how can it be solved? Thanks for your 
 help.


I don't think those come from the module you imported. Try 
importing `import dlangui;`, it should import "the world"
Dec 03