[Development] Proposing CMake as build tool for Qt 6

Alexandru Croitor alexandru.croitor at qt.io
Thu Jun 6 16:38:12 CEST 2019


Hi,

I wrote an initial draft for how to port a module from qmake to CMake, and once more of the internals have been stabilized, I intend to add those as well.  https://wiki.qt.io/CMake_Port/Porting_Guide

Note that many (not all) of the internals are actually well commented inside the source code, so it's not completely undocumented. But I understand the value to have that out-of-source, which will happen a bit later.


On 6. Jun 2019, at 16:08, Palaraja, Kavindra <KPalaraja at luxoft.com<mailto:KPalaraja at luxoft.com>> wrote:

That's good to hear. I understand that there will be two levels of documentation:

- CMake itself on their side
- Qt's CMake related content; like the macros you mention

Regarding the possibly-internal bits, I would vote for having them documented still -- even if there's a note or a disclaimer explaining their status. This is a good way for your team to maintain the messaging; instead of having random blog posts circulating online about people's experiments on these internal macros. Those would then deviate from the official messaging. Additionally, I believe some of my colleagues, who are module maintainers outside of The Qt Company, could use this information.

Sure, I'll try to help with reviews when I have some time.

Thanks for your response,
Kavindra.

On 06.06.19, 16:00, "Kai Köhne" <Kai.Koehne at qt.io<mailto:Kai.Koehne at qt.io>> wrote:



-----Original Message-----
From: Development <development-bounces at qt-project.org<mailto:development-bounces at qt-project.org>> On Behalf Of
Palaraja, Kavindra
Sent: Thursday, June 6, 2019 3:38 PM
To: development at qt-project.org<mailto:development at qt-project.org>
Subject: Re: [Development] Proposing CMake as build tool for Qt 6

Hi,

Just curious, do you have a link to what the draft documentation for CMake
looks like?

   CMake has quite extensive documentation: https://cmake.org/cmake/help/latest/

qmake's documentation has always been an afterthought. The documentation
equivalent for CMake should be better than that – at the very least, it
shouldn’t result in another https://wiki.qt.io/Undocumented_QMake and
such.

   I think this is the case 😊 We're also gradually improving the documentation of CMake macros that Qt provides, see https://codereview.qt-project.org/q/topic:%22cmake_transition%22 (reviews welcome btw).

   Now there will still be CMake macros & functions that are only used when building Qt itself (-> are internal). I don't think it makes sense yet to document them, because they're still in flux. But once things stabilize it would be IMO a good move to at least provide overview documentation.

   Regards

   Kai



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