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List:       macports-users
Subject:    Re: MacPorts downloaded package with wrong architecture on arm64 machine
From:       Ian Wadham <iandw.au () gmail ! com>
Date:       2022-09-09 5:29:33
Message-ID: BBEB892F-C7F3-448A-AD22-B736B4D80465 () gmail ! com
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Hi Ryan,

Thank you very much for your reply.

> On 9 Sep 2022, at 1:44 pm, Ryan Schmidt <ryandesign@macports.org> wrote:
> 
> On Aug 30, 2022, at 20:57, Ian Wadham wrote:
> > 
> > I recently purchased a new MacBook Pro with Monterey O/S and installed MacPorts \
> > on it from scratch. 
> > I installed the qt4-mac port successfully, but kdelibs4 refused to install \
> > because the qt4-mac port did not support arm64 architecture and i am on an Apple \
> > Silicon arm64 machine. 
> > The problem arose because the installation process for qt4-mac included the \
> > steps: 
> > —>  Attempting to fetch qt4-mac-4.8.7_13.darwin_21.x86_64.tbz from \
> > https://packages.macports.org/qt4-mac —>  Attempting to fetch \
> > qt4-mac-4.8.7_13.darwin_21.x86_64.tbz.rmd160 from \
> > https://packages.macports.org/qt4-mac 
> > The second step succeeded, i.e. MacPorts itself downloaded an inappropriate \
> > package for an Apple Silicon machine. I noticed that some (maybe not all) of \
> > qt4-mac's dependencies were compiled or downloaded as arm64 code and, curiously, \
> > some of Qt4's utility apps work on my machine, perhaps due to the Rosetta \
> > emulator stepping in and taking over. 
> > The kdelibs4 install failed in the "Computing dependencies…" step, saying \
> > "Error: Cannot install kdelibs4 for the arch arm64 because its dependency qt4-mac \
> > only supports the archs ‘ppc ppc64 i386 x86_64'" 
> > Is this a bug or is it the end of the line for kdelibs4 on arch64? Can kdelibs4 \
> > really build as arch64? And what about its (enormous) list of other dependencies? \
> > Do they all build for arch64? 
> > If there is a bug here, I think it is that MacPorts can download a package for an \
> > inappropriate architecture.
> 
> MacPorts correctly installed qt4-mac for x86_64 on your machine because qt4-mac \
> does not support arm64. The x86_64 qt4-mac will work on your arm64 Mac via Rosetta \
> 2 dynamic translation. 
> kdelibs4, and all other ports that use qt4-mac, need to be declared to be \
> arm64-incompatible, due to qt4-mac's arm64 incompatibility. 
> See https://trac.macports.org/ticket/65765
> 

Even if someone can get kdelibs4 and qt4-mac to play nicely together on arm64 Apple \
Silicon architecture, using Rosetta, I don't hold out much hope for kdelibs4's other \
dependencies, which are numerous and complex and quite huge. 

They are one reason why the KDE team switched to a radically different library \
organisation called Frameworks or KF5, based on Qt5.

I think most of the KDE apps have been ported and are up-to-date on KF5 and Qt5 and \
installable in Linux and Windows. But availability on Mac appears to be a grey area \
(pace Homebrew).

The KDE4 versions of the apps still work quite well on MacPorts on an x86_64 machine, \
although KMyMoney4 no longer works for me on my older MacBook (2017 vintage).

Cheers,
Ian Wadham.=


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