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

[From: Daniil Ivanov]

Hi David!

This is how you directory structure should look,
you have only one project with name oh-my and it contains one
application and one library

$ tree oh-my
oh-my
├── app
│   ├── app.cpp
│   ├── app.h
│   └── app.pro
├── lib
│   ├── lib.cpp
│   ├── lib.h
│   └── lib.pro
└── oh-my.pro

2 directories, 7 files

And you don't need replace() for anything.

~Daniil

On Fri, Aug 5, 2011 at 11:39 PM, David Talmage <talmage at acm.org> wrote:
> Thanks to Danil, Ville, and Christian for taking the time to answer my call
> for help.
>
> On Thursday, August 04, 2011 06:16:16 AM Daniil Ivanov wrote:
>
>>  I agree that three project files are the way to go:
>> ...
>>  This is how you declare your library for your application
>>  http://doc.qt.nokia.com/latest/qmake-project-files.html#declaring-other-li
>> braries
>
> I got about that far.  More below.
>
> To answer Ville's question about the need for a separate library: I refactored
> my application into a library that other applications can use and an
> application that uses the library.  I have at least one more application in
> mind that will use this library.  For the curious, it's a home-grown dialog
> for choosing contacts.  I wrote it last year because the native Maemo contacts
> dialog didn't support pre-selecting some contacts. (The documentation said it
> did but I couldn't make it work at all.)
>
> To answer Christian's question about linking: By "can't link" I mean that the
> linker can't find my library, so it complains about undefined symbols.
>
>
> I have a directory structure like this:
>
> 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
>
> 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.
>
> After that, my challenge is to install liblib.so in the simulator so that app
> can load it.  That's just the usual packaging task, right?
>
>
> Dave
>
>> On Thu, Aug 4, 2011 at 12:48 PM, Ville M. Vainio <vivainio at gmail.com> wrote:
>> > Do you have a particular reason for the requirement (like license) to
>> > have a separate library, instead of just having one monolithic
>> > application?
>> >
>> > On Wed, Aug 3, 2011 at 10:03 PM, David Talmage <talmage at acm.org> wrote:
>> >> I need help making QtCreator build an application and a library for
>> >> Maemo, Symbian (using the remote compiler), and the simulator.  I've
>> >> been all over the documentation, the forum on Qt Developer Network, and
>> >> Google.  I can't find an example that does what I need.
>> >>
>> >> I have a library (lib) and an application (app). Each one is a QtCreator
>> >> project.  I can build them individually but I can't link app with
>> >> liblib.so. Whatever I use has to work with maemo.org's autobuilder and
>> >> Nokia's remote compiler for Symbian.
>> >>
>> >> As a first pass, it would help if there is an environment variable I can
>> >> reference in app.pro like $$OUT_PWD that contains the name of the build
>> >> directory for lib.  Then linking might work.  I can hack something
>> >> together with qmake's replace(), like replace($$OUT_PWD, app, lib) and
>> >> that might work as long as app/ and lib/ were in the same directory.  I
>> >> don't know how well it would port or whether it would continue to work
>> >> when I install app and liblib.so on the phones.
>> >>
>> >> Dave
>> >> ...
>> > ...
>> ...
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