new file mode 100644
--- /dev/null
+++ b/build/unix/build-gcc/7F74F97C103468EE5D750B583AB00996FC26A641.key
@@ -0,0 +1,54 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
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+-----END PGP PUBLIC KEY BLOCK-----

--- a/build/unix/build-gcc/build-gcc.sh
+++ b/build/unix/build-gcc/build-gcc.sh
@@ -1,38 +1,16 @@
 #!/bin/bash
 
 set -e
 set -x
 
 make_flags='-j12'
 
-if [ -z "$root_dir" -o ! -d "$root_dir" ]; then
-  root_dir=$(mktemp -d)
-fi
-
-if test -z $TMPDIR; then
-  TMPDIR=/tmp/
-fi
-
-mkdir $root_dir/gpg
-GPG="gpg --homedir $root_dir/gpg"
-
-> $root_dir/downloads
-
-download() {
-  wget -c -P $TMPDIR $1/$2
-  (cd $TMPDIR; sha256sum $2) >> $root_dir/downloads
-}
-
-download_and_check() {
-  download $1 ${2%.*}
-  wget -c -P $TMPDIR $1/$2
-  $GPG --verify $TMPDIR/$2 $TMPDIR/${2%.*}
-}
+. $data_dir/download-tools.sh
 
 prepare() {
   pushd $root_dir
   download_and_check ftp://ftp.gnu.org/gnu/binutils binutils-$binutils_version.tar.$binutils_ext.sig
   tar xaf $TMPDIR/binutils-$binutils_version.tar.$binutils_ext
 
   case "$gcc_version" in
   *-*)
@@ -90,29 +68,91 @@ prepare() {
 
 apply_patch() {
   pushd $root_dir/gcc-$gcc_version
   patch -p1 < $1
   popd
 }
 
 build_binutils() {
+  # if binutils_configure_flags is not set at all, give it the default value
+  if [ -z "${binutils_configure_flags+xxx}" ];
+  then
+    # gold is disabled because we don't use it on automation, and also we ran into
+    # some issues with it using this script in build-clang.py.
+    binutils_configure_flags="--disable-gold --enable-plugins --disable-nls"
+  fi
+
   mkdir $root_dir/binutils-objdir
   pushd $root_dir/binutils-objdir
-  # gold is disabled because we don't use it on automation, and also we ran into
-  # some issues with it using this script in build-clang.py.
-  ../binutils-$binutils_version/configure --prefix /tools/gcc/ --disable-gold --enable-plugins --disable-nls
+  ../binutils-$binutils_version/configure --prefix /tools/gcc/ $binutils_configure_flags
   make $make_flags
   make install $make_flags DESTDIR=$root_dir
   popd
 }
 
 build_gcc() {
   mkdir $root_dir/gcc-objdir
   pushd $root_dir/gcc-objdir
   ../gcc-$gcc_version/configure --prefix=/tools/gcc --enable-languages=c,c++  --disable-nls --disable-gnu-unique-object --enable-__cxa_atexit --with-arch-32=pentiumpro
   make $make_flags
   make $make_flags install DESTDIR=$root_dir
 
   cd $root_dir/tools
   tar caf $root_dir/gcc.tar.xz gcc/
   popd
 }
+
+build_gcc_and_mingw() {
+  export install_dir=$root_dir/tools/gcc/
+  mkdir -p $install_dir
+  export PATH=$PATH:$install_dir/bin/
+
+  cd $root_dir
+
+  git clone -n git://git.code.sf.net/p/mingw-w64/mingw-w64
+  pushd mingw-w64
+  git checkout $mingw_version # Asserts the integrity of the checkout (Right?)
+  popd
+
+  mkdir gcc-objdir
+  pushd gcc-objdir
+  ../gcc-$gcc_version/configure --prefix=$install_dir --target=i686-w64-mingw32 --with-gnu-ld --with-gnu-as --disable-multilib --enable-threads=posix
+  make $make_flags all-gcc
+  make $make_flags install-gcc
+  popd
+
+  mkdir mingw-w64-headers32
+  pushd mingw-w64-headers32
+  ../mingw-w64/mingw-w64-headers/configure --host=i686-w64-mingw32 --prefix=$install_dir/i686-w64-mingw32/ --enable-sdk=all --enable-secure-api --enable-idl
+  make $make_flags install
+  popd
+
+  mkdir mingw-w64-crt32
+  pushd mingw-w64-crt32
+  ../mingw-w64/mingw-w64-crt/configure --host=i686-w64-mingw32 --prefix=$install_dir/i686-w64-mingw32/
+  make
+  make install
+  popd
+
+  mkdir mingw-w64-pthread
+  pushd mingw-w64-pthread
+  ../mingw-w64/mingw-w64-libraries/winpthreads/configure --host=i686-w64-mingw32 --prefix=$install_dir/i686-w64-mingw32/
+  make
+  make install
+  popd
+
+  pushd gcc-objdir
+  make
+  make install
+  popd
+
+  mkdir widl32
+  pushd widl32
+  ../mingw-w64/mingw-w64-tools/widl/configure --prefix=$install_dir --target=i686-w64-mingw32
+  make
+  make install
+  popd
+
+  pushd $root_dir/tools
+  tar caf $root_dir/mingw32.tar.xz gcc/
+  popd
+}

new file mode 100755
--- /dev/null
+++ b/build/unix/build-gcc/download-tools.sh
@@ -0,0 +1,28 @@
+#!/bin/bash
+
+set -e
+set -x
+
+if [ -z "$root_dir" -o ! -d "$root_dir" ]; then
+  root_dir=$(mktemp -d)
+fi
+
+if test -z $TMPDIR; then
+  TMPDIR=/tmp/
+fi
+
+mkdir $root_dir/gpg
+GPG="gpg --homedir $root_dir/gpg"
+
+> $root_dir/downloads
+
+download() {
+  wget -c -P $TMPDIR $1/$2
+  (cd $TMPDIR; sha256sum $2) >> $root_dir/downloads
+}
+
+download_and_check() {
+  download $1 ${2%.*}
+  wget -c -P $TMPDIR $1/$2
+  $GPG --verify $TMPDIR/$2 $TMPDIR/${2%.*}
+}
\ No newline at end of file

old mode 100644
new mode 100755
--- a/taskcluster/ci/toolchain/linux.yml
+++ b/taskcluster/ci/toolchain/linux.yml
@@ -223,8 +223,94 @@ linux64-gn:
         script: build-gn-linux.sh
         tooltool-downloads: public
         resources:
             - 'taskcluster/scripts/misc/tooltool-download.sh'
             - 'taskcluster/scripts/misc/build-gn-common.sh'
         toolchain-artifact: public/build/gn.tar.xz
     toolchains:
         - linux64-gcc-4.9
+
+linux64-upx:
+    description: "UPX build for MinGW32 Cross Compile"
+    treeherder:
+        kind: build
+        platform: toolchains/opt
+        symbol: TMW(upx)
+        tier: 2
+    worker-type: aws-provisioner-v1/gecko-{level}-b-linux
+    worker:
+        docker-image: {in-tree: desktop-build}
+        max-run-time: 3600
+    run:
+        using: toolchain-script
+        script: build-upx.sh
+        toolchain-artifact: public/build/upx.tar.xz
+
+linux64-wine:
+    description: "Wine build for MinGW32 Cross Compile"
+    treeherder:
+        kind: build
+        platform: toolchains/opt
+        symbol: TMW(wine)
+        tier: 2
+    worker-type: aws-provisioner-v1/gecko-{level}-b-linux
+    worker:
+        docker-image: {in-tree: desktop-build}
+        max-run-time: 10800
+    run:
+        using: toolchain-script
+        script: build-wine.sh
+        toolchain-artifact: public/build/wine.tar.xz
+
+linux64-mingw32-gcc:
+    description: "GCC toolchain build for MinGW32 Cross Compile"
+    treeherder:
+        kind: build
+        platform: toolchains/opt
+        symbol: TMW(mingw32-gcc)
+        tier: 2
+    worker-type: aws-provisioner-v1/gecko-{level}-b-linux
+    worker:
+        docker-image: {in-tree: desktop-build}
+        max-run-time: 10800
+    run:
+        using: toolchain-script
+        script: build-gcc-mingw32.sh
+        resources:
+            - 'build/unix/build-gcc/build-gcc.sh'
+        toolchain-artifact: public/build/mingw32.tar.xz
+
+linux64-mingw32-nsis:
+    description: "NSIS build for MinGW32 Cross Compile"
+    treeherder:
+        kind: build
+        platform: toolchains/opt
+        symbol: TMW(mingw32-nsis)
+        tier: 2
+    worker-type: aws-provisioner-v1/gecko-{level}-b-linux
+    worker:
+        docker-image: {in-tree: desktop-build}
+        max-run-time: 3600
+    run:
+        using: toolchain-script
+        script: build-mingw32-nsis.sh
+        toolchain-artifact: public/build/nsis.tar.xz
+    toolchains:
+        - linux64-mingw32-gcc
+
+linux64-mingw32-fxc2:
+    description: "fxc2.exe build for MinGW32 Cross Compile"
+    treeherder:
+        kind: build
+        platform: toolchains/opt
+        symbol: TMW(mingw32-fxc2)
+        tier: 2
+    worker-type: aws-provisioner-v1/gecko-{level}-b-linux
+    worker:
+        docker-image: {in-tree: desktop-build}
+        max-run-time: 1800
+    run:
+        using: toolchain-script
+        script: build-mingw32-fxc2.sh
+        toolchain-artifact: public/build/fxc2.tar.xz
+    toolchains:
+        - linux64-mingw32-gcc
\ No newline at end of file

old mode 100644
new mode 100755
--- a/taskcluster/docker/desktop-build/Dockerfile
+++ b/taskcluster/docker/desktop-build/Dockerfile
@@ -63,13 +63,16 @@ ADD           oauth.txt /builds/worker/
 # the directory where mozharness is run (not its --work-dir)
 ADD           buildprops.json /builds/worker/
 
 # Move installation to base centos6-build image once Bug 1272629 is fixed
 # Install the screen package here to use with xvfb.
 # Install bison to build binutils.
 RUN yum install -y bison screen
 
+# For the mingw toolchain & job (scons: nsis, flex: wine, p7zip: ff installer)
+RUN yum install -y scons flex p7zip
+
 # Install libtool.
 RUN yum install -y libtool
 
 # Set a default command useful for debugging
 CMD ["/bin/bash", "--login"]

new file mode 100755
--- /dev/null
+++ b/taskcluster/scripts/misc/build-gcc-mingw32.sh
@@ -0,0 +1,50 @@
+#!/bin/bash
+set -e
+
+# This script is for building a MinGW GCC (and headers) to be used on Linux to compile for Windows.
+
+WORKSPACE=$HOME/workspace
+HOME_DIR=$WORKSPACE/build
+UPLOAD_DIR=$HOME/artifacts
+
+# Do not define root_dir so we build everything to a tmpdir
+#root_dir=$HOME_DIR
+data_dir=$HOME_DIR/src/build/unix/build-gcc
+
+. $data_dir/build-gcc.sh
+
+gcc_version=5.4.0
+gcc_ext=bz2
+binutils_version=2.27
+binutils_ext=bz2
+binutils_configure_flags="--target=i686-w64-mingw32"
+mingw_version=da41a54ba54c6e37322f111a5b76099b9cd39051
+
+# GPG keys used to sign GCC (collected from 5.1.0, 5.4.0, 6.4.0)
+$GPG --import $data_dir/33C235A34C46AA3FFB293709A328C3A2C3C45C06.key
+$GPG --import $data_dir/7F74F97C103468EE5D750B583AB00996FC26A641.key
+# GPG key used to sign binutils
+$GPG --import $data_dir/EAF1C276A747E9ED86210CBAC3126D3B4AE55E93.key
+# GPG key used to sign GMP
+$GPG --import $data_dir/343C2FF0FBEE5EC2EDBEF399F3599FF828C67298.key
+# GPG key used to sign MPFR
+$GPG --import $data_dir/07F3DBBECC1A39605078094D980C197698C3739D.key
+# GPG key used to sign MPC
+$GPG --import $data_dir/AD17A21EF8AED8F1CC02DBD9F7D5C9BF765C61E3.key
+
+cat > $root_dir/checksums <<EOF
+369737ce51587f92466041a97ab7d2358c6d9e1b6490b3940eb09fb0a9a6ac88  binutils-2.27.tar.bz2
+608df76dec2d34de6558249d8af4cbee21eceddbcb580d666f7a5a583ca3303a  gcc-5.4.0.tar.bz2
+752079520b4690531171d0f4532e40f08600215feefede70b24fabdc6f1ab160  gmp-5.1.3.tar.bz2
+7e3c02ff52f8540f6a85534f54158968417fd676001651c8289c705bd0228f36  isl-0.14.tar.bz2
+ae79f8d41d8a86456b68607e9ca398d00f8b7342d1d83bcf4428178ac45380c7  mpc-0.8.2.tar.gz
+ca498c1c7a74dd37a576f353312d1e68d490978de4395fa28f1cbd46a364e658  mpfr-3.1.5.tar.bz2
+EOF
+
+prepare
+build_binutils
+build_gcc_and_mingw
+
+# Put a tarball in the artifacts dir
+mkdir -p $UPLOAD_DIR
+cp $root_dir/mingw32.tar.* $UPLOAD_DIR

new file mode 100755
--- /dev/null
+++ b/taskcluster/scripts/misc/build-mingw32-fxc2.sh
@@ -0,0 +1,35 @@
+#!/bin/bash
+set -x -e -v
+
+WORKSPACE=$HOME/workspace
+HOME_DIR=$WORKSPACE/build
+INSTALL_DIR=$WORKSPACE/fxc2
+TOOLTOOL_DIR=$WORKSPACE/build/src
+UPLOAD_DIR=$HOME/artifacts
+
+mkdir -p $INSTALL_DIR/bin
+
+cd $TOOLTOOL_DIR
+. taskcluster/scripts/misc/tooltool-download.sh
+export PATH="$TOOLTOOL_DIR/gcc/bin:$TOOLTOOL_DIR/gcc/i686-w64-mingw32/bin:$PATH"
+
+cd $WORKSPACE
+
+# --------------
+
+git clone -n https://github.com/mozilla/fxc2.git fxc2-clone
+cd fxc2-clone
+git checkout 82527b81104e5e21390d3ddcd328700c67ce73d4 # Asserts integrity of the clone (right?)
+make
+
+cp fxc2.exe $INSTALL_DIR/bin/
+cp d3dcompiler_47.dll $INSTALL_DIR/bin/
+cp $TOOLTOOL_DIR/gcc/i686-w64-mingw32/bin/libwinpthread-1.dll $INSTALL_DIR/bin/
+
+# --------------
+
+cd $WORKSPACE
+tar caf fxc2.tar.xz fxc2
+
+mkdir -p $UPLOAD_DIR
+cp fxc2.tar.* $UPLOAD_DIR
\ No newline at end of file

new file mode 100755
--- /dev/null
+++ b/taskcluster/scripts/misc/build-mingw32-nsis.sh
@@ -0,0 +1,106 @@
+#!/bin/bash
+set -x -e -v
+
+# We set the INSTALL_DIR to match the directory that it will run in exactly,
+# otherwise we get an NSIS error of the form:
+#   checking for NSIS version...
+#   DEBUG: Executing: `/home/worker/workspace/build/src/gcc/
+#   DEBUG: The command returned non-zero exit status 1.
+#   DEBUG: Its error output was:
+#   DEBUG: | Error: opening stub "/home/worker/workspace/gcc/
+#   DEBUG: | Error initalizing CEXEBuild: error setting
+#   ERROR: Failed to get nsis version.
+
+WORKSPACE=$HOME/workspace
+HOME_DIR=$WORKSPACE/build
+INSTALL_DIR=$WORKSPACE/build/src/gcc
+TOOLTOOL_DIR=$WORKSPACE/build/src
+UPLOAD_DIR=$HOME/artifacts
+
+mkdir -p $INSTALL_DIR
+
+root_dir=$HOME_DIR
+data_dir=$HOME_DIR/src/build/unix/build-gcc
+
+. $data_dir/download-tools.sh
+
+cd $TOOLTOOL_DIR
+. taskcluster/scripts/misc/tooltool-download.sh
+# After tooltool runs, we move the stuff we just downloaded.
+# As explained above, we have to build nsis to the directory it
+# will eventually be run from, which is the same place we just
+# installed our compiler. But at the end of the script we want
+# to package up what we just built. If we don't move the compiler,
+# we will package up the compiler we downloaded along with the
+# stuff we just built.
+mv gcc gcc-mingw
+export PATH="$TOOLTOOL_DIR/gcc-mingw/bin:$TOOLTOOL_DIR/gcc-mingw/i686-w64-mingw32/bin:$PATH"
+mkdir -p $INSTALL_DIR
+
+cd $WORKSPACE
+
+$GPG --import <<EOF
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+
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+=5shY
+-----END PGP PUBLIC KEY BLOCK-----
+EOF
+
+# --------------
+
+download_and_check http://zlib.net/ zlib-1.2.11.tar.gz.asc
+tar xaf $TMPDIR/zlib-1.2.11.tar.gz
+cd zlib-1.2.11
+make -f win32/Makefile.gcc PREFIX=i686-w64-mingw32-
+
+cd ..
+wget https://downloads.sourceforge.net/project/nsis/NSIS%203/3.01/nsis-3.01-src.tar.bz2
+echo "559703cc25f78697be1784a38d1d9a19c97d27a200dc9257d1483c028c6be9242cbcd10391ba618f88561c2ba57fdbd8b3607bea47ed8c3ad7509a6ae4075138  nsis-3.01-src.tar.bz2" | sha512sum -c -
+bunzip2 nsis-3.01-src.tar.bz2
+tar xaf nsis-3.01-src.tar
+cd nsis-3.01-src
+# I don't know how to make the version work with the environment variables/config flags the way the author appears to
+sed -i "s/'VERSION', 'Version of NSIS', cvs_version/'VERSION', 'Version of NSIS', '3.01'/" SConstruct
+scons XGCC_W32_PREFIX=i686-w64-mingw32- ZLIB_W32=../zlib-1.2.11 SKIPUTILS="NSIS Menu" PREFIX=$INSTALL_DIR/ install
+
+# --------------
+
+cd $WORKSPACE/build/src
+tar caf nsis.tar.xz gcc
+
+mkdir -p $UPLOAD_DIR
+cp nsis.tar.* $UPLOAD_DIR

new file mode 100755
--- /dev/null
+++ b/taskcluster/scripts/misc/build-upx.sh
@@ -0,0 +1,40 @@
+#!/bin/bash
+set -x -e -v
+
+WORKSPACE=$HOME/workspace
+HOME_DIR=$WORKSPACE/build
+INSTALL_DIR=$WORKSPACE/upx
+UPLOAD_DIR=$HOME/artifacts
+
+mkdir -p $INSTALL_DIR/bin
+
+cd $WORKSPACE
+
+# --------------
+
+wget http://www.oberhumer.com/opensource/ucl/download/ucl-1.03.tar.gz
+echo "5847003d136fbbca1334dd5de10554c76c755f7c  ucl-1.03.tar.gz" | sha1sum -c -
+tar xf ucl-1.03.tar.gz
+cd ucl-1.03
+./configure
+make
+
+# --------------
+
+cd ..
+git clone -n https://github.com/upx/upx.git upx-clone
+cd upx-clone
+git checkout d31947e1f016e87f24f88b944439bbee892f0429 # Asserts integrity of the clone (right?)
+git submodule update --init --recursive
+export UPX_UCLDIR=$WORKSPACE/ucl-1.03
+cd src
+make
+cp upx.out $INSTALL_DIR/bin/upx
+
+# --------------
+
+cd $WORKSPACE
+tar caf upx.tar.xz upx
+
+mkdir -p $UPLOAD_DIR
+cp upx.tar.* $UPLOAD_DIR
\ No newline at end of file

new file mode 100755
--- /dev/null
+++ b/taskcluster/scripts/misc/build-wine.sh
@@ -0,0 +1,87 @@
+#!/bin/bash
+set -x -e -v
+
+WORKSPACE=$HOME/workspace
+HOME_DIR=$WORKSPACE/build
+INSTALL_DIR=$WORKSPACE/wine
+UPLOAD_DIR=$HOME/artifacts
+
+mkdir -p $INSTALL_DIR
+
+root_dir=$HOME_DIR
+data_dir=$HOME_DIR/src/build/unix/build-gcc
+
+. $data_dir/download-tools.sh
+
+cd $WORKSPACE
+
+# --------------
+$GPG --import <<EOF
+-----BEGIN PGP PUBLIC KEY BLOCK-----
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+-----END PGP PUBLIC KEY BLOCK-----
+EOF
+
+download_and_check http://dl.winehq.org/wine/source/2.0/ wine-2.0.1.tar.xz.sign
+tar xaf $TMPDIR/wine-2.0.1.tar.xz
+cd wine-2.0.1
+./configure --prefix=$INSTALL_DIR/
+make
+make install
+
+# --------------
+
+cd $WORKSPACE/
+tar caf wine.tar.xz wine
+
+mkdir -p $UPLOAD_DIR
+cp wine.tar.* $UPLOAD_DIR

old mode 100644
new mode 100755
--- a/taskcluster/taskgraph/transforms/task.py
+++ b/taskcluster/taskgraph/transforms/task.py
@@ -529,16 +529,17 @@ GROUP_NAMES = {
     'tc-cs': 'Checksum signing executed by Taskcluster',
     'tc-rs': 'Repackage signing executed by Taskcluster',
     'tc-BMcs': 'Beetmover checksums, executed by Taskcluster',
     'Aries': 'Aries Device Image',
     'Nexus 5-L': 'Nexus 5-L Device Image',
     'I': 'Docker Image Builds',
     'TL': 'Toolchain builds for Linux 64-bits',
     'TM': 'Toolchain builds for OSX',
+    'TMW': 'Toolchain builds for Windows MinGW',
     'TW32': 'Toolchain builds for Windows 32-bits',
     'TW64': 'Toolchain builds for Windows 64-bits',
     'SM-tc': 'Spidermonkey builds',
     'pub': 'APK publishing',
     'p': 'Partial generation',
     'ps': 'Partials signing',
 }