I have a work in progress patch that adds some IPC actors. With my patch applied I get all kinds of errors like this on today's m-c: 0:26.11 In file included from /srv/mozilla-central/obj-x86_64-pc-linux-gnu-optdebug/dist/include/ip c/IPCMessageUtils.h:11:0, 0:26.11 from /srv/mozilla-central/obj-x86_64-pc-linux-gnu-optdebug/ipc/ipdl/_ipdlheaders/mozilla/net/PTransportProvider.h:11, 0:26.11 from /srv/mozilla-central/obj-x86_64-pc-linux-gnu-optdebug/ipc/ipdl/PTransportProvider.cpp:7, 0:26.11 from /srv/mozilla-central/obj-x86_64-pc-linux-gnu-optdebug/ipc/ipdl/UnifiedProtocols24.cpp:2: 0:26.12 /srv/mozilla-central/ipc/chromium/src/chrome/common/ipc_message_utils.h: In instantiation of ‘void IPC::WriteParam(IPC::Message*, const P&) [with P = mozilla::gfx::IntSizeTyped<mozilla::ScreenPixel>]’: 0:26.12 /srv/mozilla-central/obj-x86_64-pc-linux-gnu-optdebug/ipc/ipdl/_ipdlheaders/mozilla/layers/PUiCompositorControllerChild.h:172:24: required from ‘void mozilla::layers::PUiCompositorControllerChild::Write(const T&, mozilla::layers::PUiCompositorControllerChild::Message*) [with T = mozilla::gfx::IntSizeTyped<mozilla::ScreenPixel>; mozilla::layers::PUiCompositorControllerChild::Message = IPC::Message]’ 0:26.12 /srv/mozilla-central/obj-x86_64-pc-linux-gnu-optdebug/ipc/ipdl/PUiCompositorControllerChild.cpp:329:23: required from here 0:26.12 /srv/mozilla-central/ipc/chromium/src/chrome/common/ipc_message_utils.h:111:24: error: ‘Write’ is not a member of ‘IPC::ParamTraits<mozilla::gfx::IntSizeTyped<mozilla::ScreenPixel> >’ 0:26.12 ParamTraits<P>::Write(m, p); 0:26.12 ^ 0:26.12 /srv/mozilla-central/ipc/chromium/src/chrome/common/ipc_message_utils.h: In instantiation of ‘bool IPC::ReadParam(const IPC::Message*, PickleIterator*, P*) [with P = mozilla::gfx::PointTyped<mozilla::ScreenPixel>]’: 0:26.12 /srv/mozilla-central/obj-x86_64-pc-linux-gnu-optdebug/ipc/ipdl/_ipdlheaders/mozilla/layers/PUiCompositorControllerChild.h:182:30: required from ‘bool mozilla::layers::PUiCompositorControllerChild::Read(T*, const Message*, PickleIterator*) [with T = mozilla::gfx::PointTyped<mozilla::ScreenPixel>; mozilla::layers::PUiCompositorControllerChild::Message = IPC::Message]’ 0:26.12 /srv/mozilla-central/obj-x86_64-pc-linux-gnu-optdebug/ipc/ipdl/PUiCompositorControllerChild.cpp:408:68: required from here 0:26.12 /srv/mozilla-central/ipc/chromium/src/chrome/common/ipc_message_utils.h:117:30: error: ‘Read’ is not a member of ‘IPC::ParamTraits<mozilla::gfx::PointTyped<mozilla::ScreenPixel> >’ 0:26.12 return ParamTraits<P>::Read(m, iter, p); 0:26.12 ^ 0:26.12 /srv/mozilla-central/ipc/chromium/src/chrome/common/ipc_message_utils.h: In instantiation of ‘bool IPC::ReadParam(const IPC::Message*, PickleIterator*, P*) [with P = mozilla::gfx::ScaleFactor<mozilla::CSSPixel, mozilla::ScreenPixel>]’: 0:26.12 /srv/mozilla-central/obj-x86_64-pc-linux-gnu-optdebug/ipc/ipdl/_ipdlheaders/mozilla/layers/PUiCompositorControllerChild.h:182:30: required from ‘bool mozilla::layers::PUiCompositorControllerChild::Read(T*, const Message*, PickleIterator*) [with T = mozilla::gfx::ScaleFactor<mozilla::CSSPixel, mozilla::ScreenPixel>; mozilla::layers::PUiCompositorControllerChild::Message = IPC::Message]’ 0:26.12 /srv/mozilla-central/obj-x86_64-pc-linux-gnu-optdebug/ipc/ipdl/PUiCompositorControllerChild.cpp:417:60: required from here 0:26.12 /srv/mozilla-central/ipc/chromium/src/chrome/common/ipc_message_utils.h:117:30: error: ‘Read’ is not a member of ‘IPC::ParamTraits<mozilla::gfx::ScaleFactor<mozilla::CSSPixel, mozilla::ScreenPixel> >’ As far as I can tell PUiCompositorController.ipdl is depending on getting GfxMessageUtils.h via the unified build. It should include it directly instead.

Thanks for the help figuring this out!

Pushed by bkelly@mozilla.com: https://hg.mozilla.org/integration/mozilla-inbound/rev/44ffc0867fbb Fix unified build bustage in PUiCompositorController.ipdl. r=kats