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qt5: could not find the qt platform plugin "cocoa" in "" #42893

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matthewbauer opened this issue Jul 2, 2018 · 10 comments
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qt5: could not find the qt platform plugin "cocoa" in "" #42893

matthewbauer opened this issue Jul 2, 2018 · 10 comments
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6.topic: darwin Running or building packages on Darwin

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@matthewbauer
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Issue description

Running into this on Dwarf Therapist on macOS. Here is the text:

qt.qpa.plugin: Could not find the Qt platform plugin "cocoa" in ""
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

abort trap: 6

Steps to reproduce

$ nix-build '<nixpkgs>' -A dwarf-fortress-packages.dwarf-therapist-original
$ ./result/Applications/DwarfTherapist.app/Contents/MacOS/DwarfTherapist
qt.qpa.plugin: Could not find the Qt platform plugin "cocoa" in ""
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

abort trap: 6
@matthewbauer matthewbauer mentioned this issue Jul 2, 2018
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@orivej
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orivej commented Jul 2, 2018

I have discovered a robust way for running Qt applications without installing them globally in #30551 (comment)

@matthewbauer
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Ok that could be helpful! Still with things like nix run it seems like there is an expectation that you shouldn't have to install things for them to work.

@orivej
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orivej commented Jul 2, 2018 •
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This is true, and this should definitely be possible to achieve at least when qtbase plugins are sufficient for the application. The only difficulty with implementing this that I know is that Qt loads all plugins that it can find, but it should only be allowed to find compatible plugins (built against the same revision of qtbase), and it probably shouldn't load the same plugin twice (when it appears in multiple search paths).

Nixpkgs support Qt plugins thanks to ttuegel/qtbase@efad454. May @ttuegel have had an alternative idea when he reverted it in ttuegel/qtbase@20ab8e8?

@LnL7 LnL7 added the 6.topic: darwin Running or building packages on Darwin label Jul 4, 2018
@matthewbauer
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matthewbauer commented Jan 25, 2019 •
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To be clear, the fix for this is:

$ nix-env -iA nixpkgs.qt5.qtbase
$ export XDG_DATA_DIRS=$HOME/.nix-profile/share:$XDG_DATA_DIRS

This was referenced Jan 25, 2019
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@jackTaw88
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To be clear, the fix for this is:

$ nix-env -iA nixpkgs.qt5.qtbase
$ export XDG_DATA_DIRS=$HOME/.nix-profile/share:$XDG_DATA_DIRS

@matthewbauer will this issue bi fixed automatically? or should we type these commands?

@matthewbauer matthewbauer reopened this Feb 14, 2019
@matthewbauer
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matthewbauer commented Feb 14, 2019 •
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This actually should be handled better with:

#54525

@jcable
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jcable commented Apr 4, 2019

I get "Could not load the Qt platform plugin "cocoa" in "" even though it was found." running a unit test from qtcreator. Any ideas how this might be resolved?

@risicle risicle mentioned this issue May 11, 2019
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@colemickens colemickens mentioned this issue Jul 24, 2019
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@peti peti mentioned this issue Aug 2, 2019
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@vuxyp
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vuxyp commented Aug 31, 2019

I have the latest version of speedcrunch.

I am using UBuntu 18.04. When I start speedcrunch I got this error:

qt.qpa.plugin: Could not find the Qt platform plugin "xcb" in ""
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

@srghma
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srghma commented Sep 24, 2019 •
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same issue when running qdigidoc4

/nix/store/k9mfjxm301y32z4m1r9gz5zl4r056n3a-qdigidoc-4.1.0/bin  qdigidoc4
qt.qpa.plugin: Could not find the Qt platform plugin "xcb" in ""
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

[1]    26252 abort      qdigidoc4

The

nix-env -iA nixpkgs.qt5.qtbase
export XDG_DATA_DIRS=$HOME/.nix-profile/share:$XDG_DATA_DIRS

indeed fixes it

installed from

nix-instantiate --eval -E '(import <nixpkgs-unstable> {}).lib.version'
"20.03pre193309.c4196cca9ac"

which is from this commit c4196cca9ac

waiting for #65399

@Dr-Big-Man Dr-Big-Man mentioned this issue Jan 3, 2020
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strager added a commit to strager/nixpkgs that referenced this issue Feb 2, 2020
@strager
chatterino2: fix install on macOS
cdd1c21 
On Darwin/macOS, chatterino2's install phase copies no files into the
output. `make install` does not copy chatterino2.app. Copy the .app
manually, fixing the installation.

With this patch, chatterino2 almost works on macOS. Issue NixOS#42893
applies, so to make chatterino2 work, you must install qtbase in your
environment. For example:

    $ nix-env -iA nixpkgs.qt5.qtbase
    $ open ~/.nix-profile/Applications/chatterino.app
@strager strager mentioned this issue Feb 2, 2020
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@worldofpeace
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this is a stale bug #65399

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@matthewbauer @orivej @jcable @LnL7 @srghma @worldofpeace @jackTaw88 @vuxyp