As a follow-up, it looks like updating to a newer LLVM version fixes the problem. That update is being tracked in https://bugzilla.mozilla.org/show_bug.cgi?id=1423307.
For anybody already hitting this bustage locally, you can try updating your clang toolchain under ~/.mozbuild/clang to the one below until the in-tree changes are landed: https://queue.taskcluster.net/v1/task/Q7sN0gfPSE-OAEV5vuGtEA/runs/0/artifacts/public/build/clang.tar.bz2 -Ryan On Tue, Dec 5, 2017 at 11:16 AM, Ryan VanderMeulen < rvandermeu...@mozilla.com> wrote: > FYI, the VC++ 2017 v14.12 toolset included in the recently-released VS2017 > 15.5 update appears to have broken building Firefox due to issues with the > Rust compiler (in particular, the version of libclang we ship with it) and > one of the system headers: > > C:\PROGRA~2\MIB055~1\2017\COMMUN~1\VC\Tools\MSVC\1412~1. > 258\include\type_traits:898:47: error: '_Ty' does not refer to a value > > Which in turns leads to a Rust panic and build failure. > > The Visual Studio installer allows you to install the prior v14.11 toolset > as well, but I haven't verified yet that our build system will properly use > it if it's there. In the mean time, I'd strongly advise avoiding this > update until it's sorted out. > > -Ryan > _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
