[webkit-dev] RFC: Removing feature flag defaults in build-webkit

Keith Miller keith_miller at apple.com
Thu Sep 21 19:05:29 PDT 2017

This seems like a good progress change we could make. I’m on board!


> On Sep 21, 2017, at 11:54 AM, Tim Horton <timothy_horton at apple.com> wrote:
> Hi, all!
> Would anybody mind if build-webkit stopped being a source of default values of feature flags?
> We have defaults for feature flags in FeatureDefines.xcconfig for Xcode, WebKitFeatures.cmake (and Options*.cmake for platform overrides) for CMake, and FeatureDefines.h for everyone. This is already a mess. But it gets worse!
> Right now, for both the Xcode and CMake builds, build-webkit overrides those with its own set of defaults (in FeatureList.pm). There is also currently an argument to fall back to the CMake defaults (--default-cmake-features) and ignore build-webkit’s defaults.
> It doesn’t make sense that build-webkit enables a different set of features than a plain ol’ ‘xcodebuild’ or ‘cmake’ in the root directory. It seems like we’ve mostly tried to keep them in sync, but that’s silly busywork for seemingly little benefit.
> If we do this, the effective changes would be as follows:
> 1) The default values of feature flags would be specified in all of the usual places except FeatureList.pm
> 2) build-webkit --help will no longer list the default value of feature flags
> 3) It will be easier (but still not easy, yet) to reason about the default value of feature flags, and keep them in sync between different ways people build
> 4) --default-cmake-features will go away, because it will always be true
> And things that wouldn’t change:
> 1) You will still be able to use --FEATURE, --no-FEATURE, and --minimal arguments to build-webkit
> Any objections or things I’ve overlooked?
> —Tim
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> webkit-dev at lists.webkit.org
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