On May 29, 2014, at 6:03 AM, Adam Strzelecki <o...@java.pl> wrote:

> Putting my 2¢ in, Qmake is IMHO good enough. Qbs is kind of vaporware, sparse 
> documentation, needs Qmake to build (woot?!).
> 
> Altogether it sounds like a clinch, we don't want to extent Qmake with ninja 
> or anything, because there comes Qbs. But Qbs isn't really there, because one 
> needs lot of work to make it more less feature equal to CMake. So we are back 
> to Qmake, huh.

Qbs has by definition more features than cmake because it is a make tool. 
Neither cmake nor qmake build anything, they just generate makefiles or project 
files. In that respect qmake and cmake are quite alike. Qbs is a full-featured 
build tool: it takes care of generating the DAG *and* executing it. It’s like 
qmake and ninja in one.

In the long run I think Qt either need Qbs as the default build system, or 
ninja support in qmake. Ninja makes all the difference when building llvm. On a 
modern system I can get null llvm rebuild times on the order of 100ms with 
ninja, and under a second with a single changed .cpp file - and that’s a big 
project. The 1 second single-file rebuilds on fairly small make-based projects 
(like examples bundled with Qt) are really bad. With cmake+ninja, a single 
changed .cpp rebuild of a small Qt example on OS X takes about 250ms.

Cheers, Kuba
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