Category Archive: Qt

Apr 27

Qt Project Statistics

For about a month, I’ve been improving a set of scirpts to calculate statistics on the Qt Project. What I wanted to know, at first, was how well I was doing, how much I was contributing. Another question I had in mind and I know many others did too was “how much is the Qt …

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Apr 03

Qt 5 alpha released

Lars writes to let us know that the first (and hopefully only) Qt 5 alpha has been released! It’s the first in the major release series in 7 years, the first major release of the Qt Project (though not the first release in of the project, since we released 4.8.1 just a few weeks ago). …

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Feb 22

The value of passing by value

I’ve written in the past about how passing certain types by value in C++ would be more efficient than passing by constant reference. But it turns out that the ABI rules are somewhat more complex than what I said back in 2008. Time to investigate. This is also prompted by the discussion on qreal on …

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Jan 19

Update and benchmark on the dynamic library proposals

My last blog on the dynamic libraries on Linux attracted over 15000 visits, which was quite unexpected (it’s 15x more than the usual traffic). It got linked from reddit and ycombinator and comments there and in the previous post have raised some interesting questions I’ll try to answer. LD_PRELOAD First, a quck background: LD_PRELOAD and …

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Jan 16

Sorry state of dynamic libraries on Linux

Last week, we identified a bug in Qt with Olivier‘s new signal-slot syntax. Upon further investigation, it turns out it’s not a Qt issue, but an ABI one. Which prompted me to investigate more and decide that dynamic libraries need a big overhaul on Linux. tl;dr (a.k.a. Executive Summary) Shared libraries on Linux are linked …

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Jan 13

Qt temperatures drop from January to June

I’ve previously talked about how the Qt 5 Winter is coming. Since we started talking about that, people have begun asking what are the date limits for each thing, when the API would freeze, when Qt 5.0 would be stable, when we’d release, etc. This blog tries to answer that a little. Last month, we …

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Dec 22

Winter is coming

Winter is also coming for Qt 5.0: we are approaching feature freeze. The exact date, I can’t tell you, because we don’t know yet. That’s actually the subject of this blog: we need to find a date and I need your help to get there.

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Dec 15

Qt 4.8 released

Sinan is writing on the Qt Labs blog that Qt 4.8.0 is released. I won’t duplicate the entire contents of his post, so I’ll just give you the information you’re looking for: the download link. You can download it from the Download Page: Qt for Windows (binaries): MinGW, VS 2008, or VS 2010 Qt for …

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Oct 21

Qt-Project.org is live

As you may have noticed in Lars’s blog the new Qt Project website and organisation is live! Yeah! It’s the product of many people’s work over the course of a year and a half, changing the way how over 200 engineers work on their daily lives. The change is just in time for the Qt …

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Oct 18

QUrl in Qt 5: woes of hostname validity

A couple of days ago I posted on Google+ a comment when I was frustrated trying to update the QUrl hostname-parsing code. Turns out that rewriting the parser wasn’t that difficult for QUrl, but dealing with hostnames is very much so. The old code in QUrl simply deals with it directly, even what’s supposed to …

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