The android_clang_dbg_recipe trybot targets "all". Changes in V8 should trigger a recompile, but don't, e.g.:

https://build.chromium.org/p/tryserver.chromium.android/builders/android_clang_dbg_recipe/builds/130903/steps/analyze/logs/stdio

Outputs:
{
  "compile_targets": [], 
  "status": "Found dependency (all)", 
  "test_targets": []
}

It works correctly with the same set of changed V8 files and the "All" target (tested locally) and also with "all" and other files than V8, e.g.:
https://build.chromium.org/p/tryserver.chromium.android/builders/android_clang_dbg_recipe/builds/131627/steps/analyze/logs/stdio

  "files": [
    "content/browser/renderer_host/renderer_frame_manager.cc", 
    "content/browser/renderer_host/renderer_frame_manager.h"
  ],

leads to:

{
  "compile_targets": [
    "android_webview/test:_android_webview_unittests__library",
    ...

  ], 
  "status": "Found dependency", 
  "test_targets": []
}


What's the difference between "Found dependency (all)" and "Found dependency"? The target "all" is also not in the list here https://cs.chromium.org/chromium/src/testing/buildbot/gn_isolate_map.pyl and doesn't get mapped.

How can I find out which dependencies are under "all", since this is not a real gn label? I find e.g. d8 under All:

buildtools/linux64/gn desc //out/Debug //:All --all | grep //v8:d8
//v8:d8

and also under gn_all.