[Qt5-feedback] The #include directives for Qt Essentials and Qt Add-on modules

[shane.kearns at accenture.com]

> -----Original Message-----
> From: qt5-feedback-bounces+shane.kearns=accenture.com at qt.nokia.com
> [mailto:qt5-feedback-bounces+shane.kearns=accenture.com at qt.nokia.com]
> On Behalf Of lars.knoll at nokia.com
> Sent: Friday, July 01, 2011 13:31
> To: henry.haverinen at nokia.com; qt5-feedback at qt.nokia.com
> Subject: Re: [Qt5-feedback] The #include directives for Qt Essentials
> and Qt Add-on modules
>
> Yes, that's how it would look. And the advantage is that you only need
> to
> specify one include path on the compiler command line.
>
> Pushing it all into one directory is a no-go for many reasons. We're
> currently talking about how the include statements would look like.
> That
> depends on what you specifyon the compiler command line.
>
> So instead of looking at the include statements we should probably
> rather
> write down how the directory structure of Qt essential and Qt addon
> includes look like. On Unix, they'd all be under /usr/include so
> something
> like /usr/include/qt5/ should be the common base dir.
>
> In there, it should IMO look something like:
>
> QtCore/Qcore
> QtCore/qlist.h
> ...
> QtGui/QtGui
> QtGui/Qpainter
> ...
> QtAddons/MyAddon/MyAddon
> QtAddons/MyAddon/myheader.h
> QtAddons/AnotherAddon/...
>
>
> Cheers,
> Lars
>

Adding include paths on the compiler command line is similar to the "using namespace" in source files.
"-I/usr/include/qt5/QtAddons/MyAddon" would allow short #include statements with the same tradeoffs about
potential class name collisions as "using namespace QtAddons::MyAddon"

So I think you have the right idea here.
There's a requirement on the qt5 build system to easily support controlling include paths in the generated make files.

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