Error: The plugin "opencv_dart" requires a higher minimum macOS deployment version than your application is targeting

[ywu2014]

Describe the bug "opencv_dart" requires a higher minimum macOS deployment version；when i tried to resolve this problem, ld: library not found for -ld_classic occured

To Reproduce Steps to reproduce the behavior:

1. create an empty flutter project
2. add opencv_dart: ^1.2.1 dependency
3. use flutter run -d macos to start the project
4. See error

Expected behavior

Screenshots

Desktop (please complete the following information):

Additional context i tried to change minimum macOS deployment version by modify platform :osx '10.14' in macos/Podfile to platform :osx '10.15' as below but another problem appear as show below

[rainyl]

It seems that XCode 14.2 doesn't support the link option -ld_classic, which is used to supress warnings like no platform load command found in ‘libxyz.a’, assuming: macOS

• https://developer.apple.com/documentation/xcode-release-notes/xcode-15-release-notes#Linking
• https://wadetregaskis.com/no-platform-load-command-found-in-libxyz-a-assuming-macos/
• https://github.com/rainyl/dartcv/blob/9394c165f3404a696209eb316d3a3e49cb7a8526/DartCvMacOS.podspec#L46

I will remove it from OTHER_LDFLAGS

[ywu2014]

tks!

[rainyl]

@ywu2014 Update to 1.3.1 and try whether it works, -ld_classic will not be added with XCode < 15.0

[ywu2014]

@rainyl still doesn't work

XCode version is 14.2

[rainyl]

Well, kind of strange, looks like -ld_classic is still added.

Could you please run

• cd ~/.pub-cache/hosted/pub.dev/opencv_dart-1.3.1/macos
• pod lib lint --allow-warnings --verbose > a.log

and attach a.log so I can analyze it?

[rainyl]

Okay, reproduced, will working on it.

[ywu2014]

Well, kind of strange, looks like -ld_classic is still added.

Could you please run

• cd ~/.pub-cache/hosted/pub.dev/opencv_dart-1.3.1/macos
• pod lib lint --allow-warnings --verbose > a.log

and attach a.log so I can analyze it?

OK. In my system, dir ~/.pub-cache/hosted/pub.dev is empty, as shown below

so i route to pub.flutter-io.cn dir, and there is opencv_dart-1.3.1

a.log

[rainyl]

@ywu2014 Fine.

it's because the expressions in podspec uploaded to Cocoapods will be evaluated and saved as constants in json, I have totally remove the link flag, try to use:

opencv_dart:
  git:
    url: https://github.com/rainyl/opencv_dart.git
    ref: ebc1dc172854812e02c925c74eba195e335ae49b
    path: packages/opencv_dart/

[ywu2014]

@ywu2014 Fine.

it's because the expressions in podspec uploaded to Cocoapods will be evaluated and saved as constants in json, I have totally remove the link flag, try to use:

opencv_dart:
  git:
    url: https://github.com/rainyl/opencv_dart.git
    ref: ebc1dc172854812e02c925c74eba195e335ae49b
    path: packages/opencv_dart/

i have tried, but this time shows iOS deployment version problem

and i just create project support MacOS only, this is my project create command flutter create demo3 --platforms=macos，and form vscode left side view，there's no iOS related files or dir

[rainyl]

It's strange, since DartCvMacOS only supports osx, 10.15 https://github.com/rainyl/dartcv/blob/13b077fd98475ff49aff50400f7a8f34aae62b95/DartCvMacOS.podspec#L30

I tested it using:

• flutter create --template=app --platforms=macos demo
• edit pubspec.yaml and add the above dep
• edit macos/Podfile and change the minimum version to 10.15
• flutter run -d "macos"

and it works, so try to remove the project and create a fresh one. You can also run pod cache clean --all to delete the cache.

[ywu2014]

i followed your steps，and below is the result in my system

[rainyl]

@ywu2014 try to remove the cache of cocoapods, rm -rf ~/.cocoapods/repos/trunk

[ywu2014]

@ywu2014 try to remove the cache of cocoapods, rm -rf ~/.cocoapods/repos/trunk

the same problem, nothing changed

even if i run

1. pod cache clean --all
2. rm -rf ~/.cocoapods/repos/trunk
3. create another empyt project flutter create --template=app --platforms=macos demo5 the same problem still apears

[rainyl]

sad 😢 , I don't know why ...

Contact me via my email at https://github.com/rainyl if you still want to use it. I will send you my Wechat.

[ywu2014]

OK, tks！

[ywu2014]

i just upgrade my cocoapods version from 1.15.2 to 1.16.2 right now, and it works! thanks!

[rainyl]

i just upgrade my cocoapods version from 1.15.2 to 1.16.2 right now, and it works! thanks!

Glad it works! have fun :)