Is there an existing issue for this?

• I have searched the existing issues
• I have read the guide to filing a bug

Steps to reproduce

Consecutive runs of flutter run will regenerate and rebuild the C++ boilerplate, which makes the build slower.

On Desktop (at least Linux, but probably others as well), flutter run generates some C++ files such as:

linux/flutter/generated_plugin_registrant.cc
windows/flutter/generated_plugin_registrant.cc

The problem is that it will regenerate them even if they already exist. Flutter should 1st compare the contents before regenerating them, otherwise cmake will notice the new timestamp and trigger a rebuild.

Expected results

flutter run -v should not show any time spent running cmake and ninja if source files haven't changed since the last good build.

Actual results

unneeded rebuilds

Code sample

flutter create foo
cd foo
flutter run
flutter run -v

Screenshots or Video

No response

Logs

[ +414 ms] [2/5] Building CXX object CMakeFiles/pointless.dir/flutter/generated_plugin_registrant.cc.o
[  +20 ms] [3/5] Building CXX object CMakeFiles/pointless.dir/my_application.cc.o
[  +99 ms] [4/5] Linking CXX executable intermediates_do_not_run/pointless
[        ] [4/5] Install the project...

Flutter Doctor output

Flutter 3.13.0 • channel stable • https://github.com/flutter/flutter.git
Framework • revision efbf63d9c6 (5 weeks ago) • 2023-08-15 21:05:06 -0500
Engine • revision 1ac611c64e
Tools • Dart 3.1.0 • DevTools 2.25.0