On Wed, May 11, 2016 at 6:45 AM, Gregory Szorc <g...@mozilla.com> wrote:
> On Thu, May 5, 2016 at 9:26 PM, Gregory Szorc <g...@mozilla.com> wrote: > > > There is a compiler bug in VS2015 that results in SSE instructions being > > emitted when they shouldn't be. Since Firefox still needs to remain > > compatible with ancient hardware that doesn't support SSE, this is > causing > > crashes on Firefox built with VS2015 (see bug 1265615). > > > > The good news is glandium found a pretty minimal reproduce case and > > reported the bug to Microsoft. > > > > The bad news is the issue still reproduces in the latest pre-release > > version of the Visual C++ toolchain. > > > > The worse news is we'll have to revert to building Firefox 48 (current > > Aurora) and 49 (current central) with VS2013. Bugs 1270664 and 1270714 > > track. Aurora will likely land soon. Central might take a few days, as I > > believe VS2013 is a bit broken on central at the moment. > > > > We have a change in plans. > > bsmedberg says we can require SSE. So that means the VS2015 bug emitting > SSE instructions isn't an issue. > > But we need to teach the updater to advertise CPU features in the Firefox > version before we drop SSE so we don't update users to a binary that won't > work. Since Firefox 48/Aurora is currently using VS2015, that would mean > teaching Firefox 47/Beta new tricks. Since we're already in the middle of > the Beta cycle and there is no major user benefit to shipping VS2015 builds > at this time, we're going to revert to VS2013 on Firefox 48/Aurora and > build the updater support into Firefox 48/Aurora. Firefox 49/Nightly will > continue to build with VS2015 and will be the first Firefox version to > require SSE. > > Bug 1271755 is our tracker for requiring SSE to run Firefox. > As we are dropping another set of users in Firefox 48 in addition to OS X 10.6~10.8, could we reconsider making Firefox 48 a half-ESR as I proposed in [1]? [1] https://groups.google.com/d/msg/mozilla.dev.platform/gXZj0rQWEfI/RIeuLYTvAAAJ - Xidorn _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
