The interface of Gigacage was changed in https://bugs.webkit.org/show_bug.cgi?id=174972 but the SYSTEM_MALLOC implementation in WTF was not updated.
Created attachment 322018 [details] Patch Putting up for review to make sure this is the correct fix
This should fix the WinCairo build which is x64 https://build.webkit.org/builders/WinCairo%2064-Bit%20Release/builds/6661/steps/compile-webkit/logs/stdio
Created attachment 322052 [details] Patch Rebasing after https://bugs.webkit.org/show_bug.cgi?id=177565
<rdar://problem/34713975>
Comment on attachment 322052 [details] Patch r=me if this has been tested to work. Is it tested?
Comment on attachment 322052 [details] Patch It was building and running locally for me.
Comment on attachment 322052 [details] Patch Clearing flags on attachment: 322052 Committed r222615: <http://trac.webkit.org/changeset/222615>
All reviewed patches have been landed. Closing bug.