RESOLVED INVALID 229348
Improve diagnostics for missing files in DerivedSources.make 
https://bugs.webkit.org/show_bug.cgi?id=229348
Summary Improve diagnostics for missing files in DerivedSources.make
Alexey Proskuryakov
Reported 2021-08-20 13:19:09 PDT
We are seeing mysterious build failures in certain scenarios which looks like this: make: *** No rule to make target `UserAgentScripts.h', needed by `all'. Stop. The theory is that some files that should be present in the file system aren't, but the error is not clear enough. Let's add better diagnostics to isolate the issue. cf. rdar://81042866
Attachments
proposed patch (2.41 KB, patch)
2021-08-20 13:31 PDT, Alexey Proskuryakov 		no flags
DetailsFormatted DiffDiff
View All Add attachment proposed patch, testcase, etc.
Radar WebKit Bug Importer
Comment 1 2021-08-20 13:19:23 PDT
<rdar://problem/82182815>
Alexey Proskuryakov
Comment 2 2021-08-20 13:31:24 PDT
Created attachment 436022 [details] proposed patch In testing, this patch appears to resolve the build failures instead of providing diagnostics, which is not quite satisfactory, and the theory may be incorrect. I don't see how to further diagnose the issue, and in any case, we'll have better diagnostics if the build fails again in the future, so it's an improvement either way.
Aakash Jain
Comment 3 2021-08-24 11:37:45 PDT
rs=me
Alexey Proskuryakov
Comment 4 2021-08-24 18:24:14 PDT
Comment on attachment 436022 [details] proposed patch Landing with review from Aakash and me (as it's not my patch).
EWS
Comment 5 2021-08-24 18:57:28 PDT
Committed r281540 (240907@main): <https://commits.webkit.org/240907@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 436022 [details].
WebKit Commit Bot
Comment 6 2021-08-24 23:20:05 PDT
Re-opened since this is blocked by bug 229487
Alexey Proskuryakov
Comment 7 2021-08-26 10:26:35 PDT
We no longer think that it's going to work. The script that verifies xcfilelists by running make in debug mode thinks that these fake outputs are real, and modifying it feels like it would be too much of a hack.
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