[Development] Proposing CMake as build tool for Qt 6

[Bogdan Vatra]

Hi,

  Multi-arch builds was the biggest win of QBS which supported them not only 
for iOS but for Android and I think for any platform.
  Again multi-arch builds are out for years but no cmake support :).

Cheers,
BogDan.

În ziua de joi, 6 iunie 2019, la 16:28:20 EEST, Alexandru Croitor a scris:
> Hi,
> 
> There are 3rd party solutions for PCH in CMake, but we have not tested those
> yet.
 
> 
> Regarding iOS, I did some investigation work 2-ish months ago and here's
> what I can say:
 
> - CMake still has bugs here and there regarding iOS, but the patches I
> submitted so far to upstream CMake were merged. So I hope along the way we
> can iron out the issues before Qt 6 is released.
 
> - CMake has no proper support for doing multi-arch builds (simulator x64 +
> arm64 at the same time). We would either have to find a way to fix it
> upstream, possibly find some hack, or resort to building multiple types for
> different architectures, and then lipo-ing things together. 
 
> Note that the current support for multi-arch builds in qmake I would call
> hack-ish, given that no other build tool that I know of, does the same
> things that qmake does.
 
> - We will have to figure out which 3rd party package provide we want to use
> for CI, for packages like PCRE2, Freetype, etc, because for all the ones i
> tried (Conan, vcpkg, hunter), all of them need custom patches to support
> iOS builds.
 
> Other than that, with some WIP non-merged patches in qtbase, I was able to
> build parts of qtbase with CMake, targeting armv8 iOS.
 
> So there's still some work to be done, but in principle it should be
> doable.
 
> 
> > On 6. Jun 2019, at 15:13, Bogdan Vatra via Development
> > <development at qt-project.org> wrote:
 
> > În ziua de joi, 6 iunie 2019, la 14:45:14 EEST, Simon Hausmann a scris:
> > 
> >> Hi,
> >> 
> >> In the past months we, some developers from the Qt Company and KDAB,
> >> have made good progress on the port of Qt to use CMake as build tool.
> >> Since the initial prototype, the port has advanced very well and its
> >> current state can be summarized roughly like this:
> >> 
> >> 
> >>    * Builds on
> >>    
> >>      * Windows (desktop)
> >>      * macOS
> >>      * Linux (desktop and embedded)
> >>      * Android (running not tested yet)
> >> 
> >> 
> > 
> > 
> > Any news about iOS/tvOS/watchOS and PCH?
> > 
> > Cheers,
> > BogDan.
> > 
> > 
> > _______________________________________________
> > Development mailing list
> > Development at qt-project.org
> > https://lists.qt-project.org/listinfo/development
> 
>