gecko-dev/CLOBBER
Gregory Szorc 7ca3e9dc57 Bug 1186060 - Build with Visual Studio 2015 Update 1; r=ted, ehsan
This commit switches Windows builds from Visual Studio 2013
to Visual Studio 2015 Update 1.

Previously, Visual Studio was installed on the builders as part
of the base system image. Starting with this commit, we obtain
Visual Studio from a pre-generated, self-contained archive
containing the executables, Windows SDK, and other support
files. This means that new Windows toolchains can be installed
without having to modify configuration of machines in automation!

The mozconfigs for Visual Studio 2015 are a bit different from
existing mozconfigs.

Because it appears to be completely redundant and not necessary,
the LIBPATH variable has been dropped.

The order of paths in PATH, LIB, and INCLUDE has changed. The new
order more accurately reflects what would be defined by
vcvarsall.bat.

As part of switching to Visual Studio 2015, the Universal CRT is
now required. So, the 2015 mozconfigs export WIN_UCRT_REDIST_DIR
to define the location to those files.

The switch to Visual Studio 2015 also involves the switch from
the Windows 8.1 SDK to the Windows 10 SDK. However, we still
target an old version of Windows, so this hopefully shouldn't
have any significant fallout.

It's worth noting that switching to Visual Studio 2015 makes
builds - especially PGO builds - significantly faster. Our
PGO build times in automation are ~1 hour faster. Our regular
builds appear to be a few minutes faster.

MozReview-Commit-ID: Pa5GW8V87Q

--HG--
extra : rebase_source : bff4fad17f781d8d21bdb941bdd500955d1e9f08
extra : amend_source : faa3038c290fdf5cdd3e24a45ba2a37490f68c17
extra : source : 56b27306d3257445f70374aa78fc5bd42ef300ce
2016-03-24 09:12:19 -07:00

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# To trigger a clobber replace ALL of the textual description below,
# giving a bug number and a one line description of why a clobber is
# required. Modifying this file will make configure check that a
# clobber has been performed before the build can continue.
#
# MERGE NOTE: When merging two branches that require a CLOBBER, you should
# merge both CLOBBER descriptions, to ensure that users on
# both branches correctly see the clobber warning.
#
# O <-- Users coming from both parents need to Clobber
# / \
# O O
# | |
# O <-- Clobber O <-- Clobber
#
# Note: The description below will be part of the error message shown to users.
#
# Modifying this file will now automatically clobber the buildbot machines \o/
#
# Are you updating CLOBBER because you think it's needed for your WebIDL
# changes to stick? As of bug 928195, this shouldn't be necessary! Please
# don't change CLOBBER for WebIDL changes any more.
Bug 1186060 - Switch Windows compiler from VS2013 to VS2015