Clang-cl doesn't support using /Yc without /FI and gives a warning. Without ninja we don't seem to get any pch built, with it, we seem to get one built by CL that clang-cl cannot read.
Created attachment 314764 [details] Patch to pass /FI for clang-cl builds when making precompiled headers
Created attachment 314774 [details] Patch to pass /FI for clang-cl builds when making precompiled headers
Comment on attachment 314774 [details] Patch to pass /FI for clang-cl builds when making precompiled headers Clearing flags on attachment: 314774 Committed r219228: <http://trac.webkit.org/changeset/219228>
All reviewed patches have been landed. Closing bug.