On Tue, May 10, 2016 at 7:29 PM, Xidorn Quan <quanxunz...@gmail.com> wrote:
> 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 What you're suggesting is to continue providing support for these platforms for a longer period of time. The intention is to stop supporting these platforms. We have already made the decision (and in the case of OSX announced it). I don't think we have good cause to change this decision at this point. Lawrence _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
