[maemo-developers] QtCreator, libraries, and multiple platforms

[From: Christian Kandeler]

On Fri, 2011-08-05 at 16:39 -0400, ext David Talmage wrote:
> N900/app
> N900/app-uberproject
> N900/lib
> 
> The contain, respectively, the app, the subdirs project, and the library.
> 
> I'm building for Maemo, Harmattan, Simulator, and Remote Compiler. In short, 
> everything but Desktop.
> 
> When I build for Simulator, I get directories
> 
> N900/app-build-simulator
> N900/app-uberproject-build-simulator
> N900/lib-build-simulator

But this is not a SUBDIRS project, is it? If it were, your directory
structure would look like this:
    <my-project-build-simulator/app
    <my-project-build-simulator/lib
    <my-project-build-maemo/app
    <my-project-build-maemo/lib
     ...
Then you could just add "LIBS += -L$$OUT_PWD/../lib -llib" to your
application's pro file and the correct library would be found for every
platform.

> The next challenge is to teach app.pro how to find the library for the build 
> platform, simulator in the example above.  It looks like some hackery-pokery 
> with replace() will do the job.  I was hoping that QMake would Do The Right 
> Thing for me.

Also, if, like you said, there is not a 1:1 mapping between the library
and the application, I'd put them into separate projects. Then when you
change your library, you just deploy it to your sysroot (for
Maemo/Harmattan, don't know about the other platforms) and the linker
will find it there when linking the application.


Christian