No. GCC *has* an LTO optimizer, but we're not using it. We're just doing a PGO build. MSVC requires enabling LTO to use their PGO, so the resulting build has both.
-Ted On Fri, Apr 8, 2016, at 05:08 PM, Jeff Gilbert wrote: > I thought Linux did LTO but not PGO? > > On Tue, Apr 5, 2016 at 3:53 PM, Mike Hommey <[email protected]> wrote: > > On Tue, Apr 05, 2016 at 09:02:09PM +0100, David Burns wrote: > >> Below is a highlight of all work the build peers have done in the last 2 > >> weeks as part of their work to modernise the build infrastructure. > >> > >> Since the last report[1] a large number of improvements have landed in > >> Mozilla Central. > >> > >> The build system now lazily installs test files. Before, the build copied > >> tens of thousands of test and support files. This could take dozens of > >> seconds on Windows or machines with slow I/O. Now, the build system defers > >> installing test files until they are needed there (e.g. when running tests > >> or creating test packages). Furthermore, only the test files relevant to > >> the action performed are installed. Mach commands running tests should be > >> significantly faster, as they no longer examine the state of tens of > >> thousands of files on every invocation. > >> > >> After upgrading build machines to use VS2015, we have seen a decrease in > >> build times[2] for PGO on Windows by around 100 minutes. This brings PGO > >> times on Windows in line with that of PGO(Strictly speaking this is LTO) > >> times on Linux. > > > > Just a nit: strictly speaking Windows builds do PGO+LTO, Linux builds do > > PGO, but not LTO. > > > > Mike > > _______________________________________________ > > dev-platform mailing list > > [email protected] > > https://lists.mozilla.org/listinfo/dev-platform > _______________________________________________ > dev-platform mailing list > [email protected] > https://lists.mozilla.org/listinfo/dev-platform _______________________________________________ dev-platform mailing list [email protected] https://lists.mozilla.org/listinfo/dev-platform
