Provide better error message when a linked dependency doesn't exist

This comes up for dart2js when the location for dart2js_platform.dill is invalid
or when the file was not provided. Today dart2js produces a bad crash message in
that scenario, instead of a readable error.

I wanted to provide a better message, but I'm not sure I can. For example, I
wanted to say "SDK Platform file not found", but I can't because linked
dependencies can be used for other puposes.

Change-Id: I1739ec36dab16b2fd72552e5e7716cd573a8ebd0
Reviewed-on: https://dart-review.googlesource.com/46943
Commit-Queue: Sigmund Cherem <sigmund@google.com>
Reviewed-by: Peter von der Ahé <ahe@google.com>
1 file changed
tree: 96a16ce14365711872de7811ac9ddb159201c80e
  1. build/
  2. client/
  3. docs/
  4. pkg/
  5. runtime/
  6. samples/
  7. samples-dev/
  8. sdk/
  9. tests/
  10. third_party/
  11. tools/
  12. utils/
  13. .clang-format
  14. .gitattributes
  15. .gitignore
  16. .gn
  17. .mailmap
  18. .packages
  19. AUTHORS
  20. BUILD.gn
  21. CHANGELOG.md
  22. codereview.settings
  23. DEPS
  24. LICENSE
  25. PATENTS
  26. PRESUBMIT.py
  27. README.dart-sdk
  28. README.md
  29. WATCHLISTS
README.md

Dart

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Using Dart

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