Required packages depending on the OS
lazarus / 23-Operating Systems

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MaxM74 · 2024-11-04 11:36

I am developing a cross platform Windows/Linux desktop application.

When the application is compiled for Windows it will use some specific
packages, when it is compiled for Linux it will use others.

The question is...is there a way to  {$ifdef} required packages
depending on the OS ?.

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cdbc · 2024-11-04 12:24

Hi
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i {$ifdef
unix}   unix-dependencies {$else}  windows-dependencies {$endif}Should
roughly do it, as Mac belongs under unix...
Regards Benny

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PascalDragon · 2024-11-04 20:13

Quote from: cdbc on November 04, 2024, 01:24:17 pmShould roughly do
it, as Mac belongs under unix...

Please note that MaxM74 is talking about packages, not units.

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cdbc · 2024-11-04 21:02

Hi
Ooopsss, sorry - my bad, that escaped me... 
Thanks Sven
Regards Benny

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dbannon · 2024-11-04 22:15

Quote from: MaxM74 on November 04, 2024, 12:36:17 pmThe question
is...is there a way to  {$ifdef} required packages depending on the OS
?.

If you are cross compiling from one machine, then you will need to
have all the required packages installed. Each compile run will (given
sensible uses of Benny's instructions) will not even know about the
ones it does not need.

If you are compiling on different platforms, obviously you only
install packages needed for that install. Again, Benny's answer may
well be that answer you are looking for.

Davo

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MaxM74 · 2024-11-05 09:36

for example...my application use image acquisition from scanners.

So if you are under Windows  in the project file (lpi) there is:
Code: XML  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i
<RequiredPackages Count="7">      <Item1>        <PackageName
Value="WIAPascal_pkg"/>      </Item1>      <Item2>        <PackageName
Value="DelphiTwain_pkg"/>      </Item2>      <Item3>       
<PackageName Value="MaxM_Commons"/>      </Item3>      <Item4>       
<PackageName Value="LazControls"/>      </Item4>      <Item5>       
<PackageName Value="BGRABitmapPack"/>      </Item5>      <Item6>     
 <PackageName Value="bgracontrols"/>      </Item6>      <Item7>      
<PackageName Value="LCL"/>      </Item7>
As you can see the first 2 items are strictly platform dependent
because they use Windows DLLs and ActiveX.

If in the near future i want to port the application to Linux what
should i do?
I should make another lpi project file where there would be something
like:
Code: XML  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i
<RequiredPackages Count="7">      <Item1>        <PackageName
Value="Sane_pkg"/>      </Item1>      ..commons Items     
My opinion is that it would be useful to add something to filter the
required packages by platform and include only those of the platform
being compiled.
example :
Code: XML  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i
<RequiredPackages Count="7">      <Item1 platform="linux">       
<PackageName Value="Sane_pkg"/>      </Item1>      <Item2
 platform="windows">        <PackageName Value="WIAPascal_pkg"/>     
</Item2>       <Item3>        <PackageName Value="LCL"/>      </Item3>

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korba812 · 2024-11-05 11:00

I also encountered this problem. I solved it by using two lpi files
(one for windows the other for unix) and a shared lpr and units/forms
files between them. This is not a perfect solution (you have to
remember to make changes to both project files, e.g. resources or new
units) however it works.

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MaxM74 · 2024-11-05 12:45

Quote from: korba812 on November 05, 2024, 12:00:42 pmI also
encountered this problem. I solved it by using two lpi files (one for
windows the other for unix) and a shared lpr and units/forms files
between them. This is not a perfect solution (you have to remember to
make changes to both project files, e.g. resources or new units)
however it works.

my idea could be a good feature to add to the IDE

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korba812 · 2024-11-05 14:17

Well, sure. But before you start implementing it, consider whether
it's better to make use of a particular package dependent on the build
mode instead of the platform.