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Update the Dart package creation script to copy source files instead of creating symlinks to the source tree #165242

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The use of symlinks and the use of a directory as a GN output path may cause unnecessary rebuilds when Ninja checks file modification times to determine whether build outputs are up to date.

Also remove various other unused featues that were copied from the original version of the script in the Mojo project.

…of creating symlinks to the source tree

The use of symlinks and the use of a directory as a GN output path may cause unnecessary rebuilds when Ninja checks file modification times to determine whether build outputs are up to date.

Also remove various other unused featues that were copied from the original version of the script in the Mojo project.
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It looks like this pull request may not have tests. Please make sure to add tests or get an explicit test exemption before merging.

If you are not sure if you need tests, consider this rule of thumb: the purpose of a test is to make sure someone doesn't accidentally revert the fix. Ask yourself, is there anything in your PR that you feel it is important we not accidentally revert back to how it was before your fix?

Reviewers: Read the Tree Hygiene page and make sure this patch meets those guidelines before LGTMing.If you believe this PR qualifies for a test exemption, contact "@test-exemption-reviewer" in the #hackers channel in Discord (don't just cc them here, they won't see it!). The test exemption team is a small volunteer group, so all reviewers should feel empowered to ask for tests, without delegating that responsibility entirely to the test exemption group.

@github-actions github-actions bot added the engine flutter/engine repository. See also e: labels. label Mar 15, 2025
@jason-simmons jason-simmons requested a review from jtmcdole March 17, 2025 15:21
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So GN doesn't follow symlinks for modification times? Dang.

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