[Interest] Qt 6 is much more faster to compile from source

[Nuno Santos]

Thiago,

My feedback was completely based on feeling (not actual metrics) and yesterday I have realised by feeling was driven by a release only build.

When build for release and debug, the build time is incredibly longer. 

After looking at your metrics it does seem that build Qt was even quicker before. 

I feel bit stupid now! :D

Best,

Nuno

> On 7 Sep 2021, at 18:50, Thiago Macieira <thiago.macieira at intel.com> wrote:
> 
> On Tuesday, 7 September 2021 02:52:49 PDT Tor Arne Vestbø wrote:
>> Good to hear!
>> 
>> Part of it comes from CMake generating ninja files instead of Makefiles.
> 
> Our qmake-generated Makefiles weren't that slow. Nothing compared to Automake, 
> at least.
> 
> Qt 5 qtbase/src build:
> Build succeeded, took 3:01.027s (total run time 3:01.027s), 2388.2% CPU usage
> 
> Qt 6 equivalent with Ninja:
> Build succeeded, took 222.01s (2385% CPU usage)
> 
> 3:01.027 = 181.027s (sorry, different wrapper, so they print time differently)
> 
> Same compiler, same otherwise-idle machine, icecc disabled. The configuration 
> on both builds is meant to be the same, full build.
> 
> -- 
> Thiago Macieira - thiago.macieira (AT) intel.com
>  Software Architect - Intel DPG Cloud Engineering
> 
> 
> 
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