Hello lazarus project!

I added some components into package which have some threads inside, but after building lazarus, lazarus shows the message:

This binary has no thread support compiled in. Recompile the application with a thread-driver in the program uses clause before other units using thread.

But where to put into package thread support?

Thanks.

From here<http://wiki.lazarus.freepascal.org/Multithreaded_Application_Tutorial>

:

Units needed for a multithreaded application

You don?t need any special unit for this to work with Windows. However with Linux, *Mac OS X* and FreeBSD, you need the cthreads unit and it must be the first used unit of the project (the program unit, .lpr)!

So, your Lazarus application code should look like:

program MyMultiThreadedProgram;
{$mode objfpc}{$H+}
uses
{$ifdef unix}
cthreads,
{$endif}
Interfaces, // this includes the LCL widgetset
Forms
{ add your units here },

I am assuming that the $ifdef unix doesn't return true for Mac OS X, but I am sure there is one that checks if it's a Mac...

Regards,
-Reenen

Hello Reenen,

Thanks for your fast response. Of course I know, that I need to add "cthreads" into program which I want to build with thread support, but maybe you didn't realize, that I wrote about package of components to be built into Lazarus.

You know, that MyPackage.pas file is generated automatically from LPK file and it contains this:

RL> { This file was automatically created by Lazarus. Do not edit! RL> This source is only used to compile and install the package. RL> }

TRoland;

<<< 5.9.2008 8:33 - Reenen Laurie "" >>>

From here:

Units needed for a multithreaded application

You don?t need any special unit for this to work with Windows. However with Linux, Mac OS X and FreeBSD, you need the cthreads unit and it must be the first used unit of the project (the program unit, .lpr)!

So, your Lazarus application code should look like:

program MyMultiThreadedProgram;
{$mode objfpc}{$H+}
uses
{$ifdef unix}
cthreads,
{$endif}
Interfaces, // this includes the LCL widgetset
Forms
{ add your units here },

I am assuming that the $ifdef unix doesn't return true for Mac OS X, but I am sure there is one that checks if it's a Mac...

Regards,
-Reenen

En/na Reenen Laurie ha escrit:

So, your Lazarus application code should look like:

Roland's problem is, it's not his application code but lazarus itself. Besides, projects using those components should also have threads enabled, maybe it's just a matter of using -dUseCthreads in the custom options tab of the package.

Bye

Add -dUseCThreads to the usage options of your package.

Lazarus and LCL applications using the default template will pick it up.

Vincent

Vincent Snijders wrote

Add -dUseCThreads to the usage options of your package. Lazarus and LCL applications using the default template will pick it up.

I use packages that require threading support as well. My Lazarus IDE also complained about that problem, and the above change resolved the issue for me. It should for you as well.

Regards,
- Graeme -

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