[webkit-dev] Incremental unified builds on macOS

Ken Russell kbr at google.com
Tue Jun 25 16:49:36 PDT 2019

Thanks Darin for the tip. The extra logging contained exactly what I needed
and I'm embarrassed to say this is something I broke recently. Filed
https://bugs.webkit.org/show_bug.cgi?id=199212 and working on fixing it now.


On Tue, Jun 25, 2019 at 4:20 PM Darin Adler <darin at apple.com> wrote:

> It’s unlikely the problem is due to unified builds, since those are just
> source files with includes in them.
> But I have encountered problems like this before; sometimes they are
> things affecting lots of people and I’ve been able to fix them. When trying
> to understand causes of this kind of problem in the past, an Xcode build
> system feature that Dan Bernstein told me about was really useful. To use
> it you can type this command:
> % defaults write com.apple.dt.Xcode ExplainWhyBuildCommandsAreRun -bool YES
> Then rebuild and the log will contain additional information about each
> build step.
> Good luck and please let us know what you find!
> — Darin
> PS: That should work for now since WebKit still uses the “legacy Xcode
> build system” but I hear it won’t work once we move to the modern build
> system.
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