Solution to include of non-modular header inside framework module firebase_core.FLTFirebasePlugin when trying to build ios, flutter

If you are facing this issue, here is the solution. The error is not from firebase or version of your flutter, it is just a settings in your Build setting of your xcode.

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Hopefully this helps someone. Note that xcode setting changed in the latest beta version of xcode, maybe apple is moving away from supporting the include of non-modular header inside framework modules.

steps to solve

select the runner
go to build settings, click on all below build setting
scroll down to Apple Clang - Language - Modules
change the Allow Non-modular includes in Framework Modules to "Yes" (by default this is set to "No" now)