Currently there is no option to turn on LOG, FATAL and LOG_ERROR in release build. It is useful with debugging problems with release build. The fix can be taken from: https://github.com/WebPlatformForEmbedded/WPEWebKit/commit/d0ef3bc2bf340d413c35cacd76d891de8f82ca84
Pull request: https://github.com/WebKit/WebKit/pull/13236