From e56a519fdc935d404c73ff1324ef19d5cb38448e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Storsj=C3=B6?= <martin@martin.st>
Date: Tue, 9 Jan 2018 14:29:46 +0200
Subject: [PATCH] Split the building of the toolchain into individual
 shellscripts

This simplifies building the toolchain outside of docker.
---
 .dockerignore        |   6 ++
 .gitignore           |   6 ++
 Dockerfile           | 241 ++++---------------------------------------
 README.md            |  55 ++++------
 build-all.sh         |  15 +++
 build-compiler-rt.sh |  56 ++++++++++
 build-libcxx.sh      | 142 +++++++++++++++++++++++++
 build-llvm.sh        |  48 +++++++++
 build-mingw-w64.sh   |  63 +++++++++++
 install-wrappers.sh  |  20 ++++
 10 files changed, 395 insertions(+), 257 deletions(-)
 create mode 100644 .dockerignore
 create mode 100644 .gitignore
 create mode 100755 build-all.sh
 create mode 100755 build-compiler-rt.sh
 create mode 100755 build-libcxx.sh
 create mode 100755 build-llvm.sh
 create mode 100755 build-mingw-w64.sh
 create mode 100755 install-wrappers.sh

diff --git a/.dockerignore b/.dockerignore
new file mode 100644
index 0000000..7df65db
--- /dev/null
+++ b/.dockerignore
@@ -0,0 +1,6 @@
+llvm
+mingw-w64
+compiler-rt
+libunwind
+libcxxabi
+libcxx
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..7df65db
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,6 @@
+llvm
+mingw-w64
+compiler-rt
+libunwind
+libcxxabi
+libcxx
diff --git a/Dockerfile b/Dockerfile
index 3fcaa85..b0c34f8 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -8,238 +8,39 @@ RUN apt-get update -qq && apt-get install -qqy \
 RUN git config --global user.name "LLVM MinGW" && \
     git config --global user.email root@localhost
 
-WORKDIR /build
-
-# When cloning master and checking out a pinned old hash, we can't use --depth=1.
-# Do the git-svn rebase to populate git-svn information, to make
-# "clang --version" produce SVN based version numbers.
-RUN git clone -b master https://github.com/llvm-mirror/llvm.git && \
-    cd llvm/tools && \
-    git clone -b master https://github.com/llvm-mirror/clang.git && \
-    git clone -b master https://github.com/llvm-mirror/lld.git && \
-    cd .. && \
-    git svn init https://llvm.org/svn/llvm-project/llvm/trunk && \
-    git config svn-remote.svn.fetch :refs/remotes/origin/master && \
-    git svn rebase -l && \
-    git checkout c8f103e52b297f3e3e0ed1756e11373c68af3566 && \
-    cd tools/clang && \
-    git svn init https://llvm.org/svn/llvm-project/cfe/trunk && \
-    git config svn-remote.svn.fetch :refs/remotes/origin/master && \
-    git svn rebase -l && \
-    git checkout fdd60aee9c0ea40fa0423d6e43821f53d07961d5 && \
-    cd ../lld && \
-    git svn init https://llvm.org/svn/llvm-project/lld/trunk && \
-    git config svn-remote.svn.fetch :refs/remotes/origin/master && \
-    git svn rebase -l && \
-    git checkout f4208caae12f685c06657aa6e2b9b1eda4adcdb4
+WORKDIR /build/llvm-mingw
 
 ARG CORES=4
 
-# Build LLVM
-RUN cd llvm && mkdir build && cd build && cmake \
-    -DCMAKE_INSTALL_PREFIX="/build/prefix" \
-    -DCMAKE_BUILD_TYPE=Release \
-    -DLLVM_ENABLE_ASSERTIONS=ON \
-    -DLLVM_TARGETS_TO_BUILD="ARM;AArch64;X86" \
-    ../ && \
-    make -j$CORES && \
-    make install
-
-RUN git clone git://git.code.sf.net/p/mingw-w64/mingw-w64 && \
-    cd mingw-w64 && \
-    git checkout 66fab9591c250ade399e9fe91ceda239a735649c
-
-
 ENV TOOLCHAIN_PREFIX=/build/prefix
-ENV PATH=$TOOLCHAIN_PREFIX/bin:$PATH
+
+# Build LLVM
+COPY build-llvm.sh .
+RUN ./build-llvm.sh $TOOLCHAIN_PREFIX
+
 ENV TOOLCHAIN_ARCHS="i686 x86_64 armv7 aarch64"
 
-RUN cd mingw-w64/mingw-w64-headers && \
-    for arch in $TOOLCHAIN_ARCHS; do \
-        mkdir build-$arch && cd build-$arch && \
-        ../configure --host=$arch-w64-mingw32 --prefix=$TOOLCHAIN_PREFIX/$arch-w64-mingw32 \
-            --enable-secure-api --enable-idl --with-default-win32-winnt=0x600 && \
-        make install && \
-        cd .. || exit 1; \
-    done
-
 # Install the usual $TUPLE-clang binaries
-COPY wrappers/clang-target-wrapper /build/prefix/bin
-RUN cd $TOOLCHAIN_PREFIX/bin && \
-    for arch in $TOOLCHAIN_ARCHS; do \
-        for exec in clang clang++; do \
-            ln -s clang-target-wrapper $arch-w64-mingw32-$exec; \
-        done; \
-    done
+COPY wrappers/clang-target-wrapper ./wrappers/
+COPY install-wrappers.sh .
+RUN ./install-wrappers.sh $TOOLCHAIN_PREFIX
 
-# Build mingw with our freshly built cross compiler
-RUN cd mingw-w64/mingw-w64-crt && \
-    for arch in $TOOLCHAIN_ARCHS; do \
-        mkdir build-$arch && cd build-$arch && \
-        case $arch in \
-        armv7) \
-            FLAGS="--disable-lib32 --disable-lib64 --enable-libarm32" \
-            ;; \
-        aarch64) \
-            FLAGS="--disable-lib32 --disable-lib64 --enable-libarm64" \
-            ;; \
-        i686) \
-            FLAGS="--enable-lib32 --disable-lib64" \
-            ;; \
-        x86_64) \
-            FLAGS="--disable-lib32 --enable-lib64" \
-            ;; \
-        esac && \
-        CC=$arch-w64-mingw32-clang \
-        AR=llvm-ar RANLIB=llvm-ranlib DLLTOOL=llvm-dlltool ../configure --host=$arch-w64-mingw32 --prefix=$TOOLCHAIN_PREFIX/$arch-w64-mingw32 $FLAGS && \
-        make -j$CORES && make install && \
-        cd .. || exit 1; \
-    done
+# Build MinGW-w64
+COPY build-mingw-w64.sh .
+RUN ./build-mingw-w64.sh $TOOLCHAIN_PREFIX
 
-RUN git clone -b master https://github.com/llvm-mirror/compiler-rt.git && \
-    cd compiler-rt && \
-    git checkout 1d871d6cd3fed01cd50dd63e743bd2ea6e65eab6
+# Build compiler-rt
+COPY build-compiler-rt.sh .
+RUN ./build-compiler-rt.sh $TOOLCHAIN_PREFIX 6.0.0
 
-# Add a symlink for i386 -> i686; we normally name the toolchain
-# i686-w64-mingw32, but due to the compiler-rt cmake peculiarities, we
-# need to refer to it as i386 at this stage.
-RUN cd $TOOLCHAIN_PREFIX && ln -s i686-w64-mingw32 i386-w64-mingw32
+# Build libunwind/libcxxabi/libcxx
+COPY build-libcxx.sh merge_archives.sh ./
+RUN ./build-libcxx.sh $TOOLCHAIN_PREFIX
 
-# Manually build compiler-rt as a standalone project
-RUN cd compiler-rt && \
-    for arch in $TOOLCHAIN_ARCHS; do \
-        buildarchname=$arch && \
-        libarchname=$arch && \
-        case $arch in \
-        armv7) \
-            libarchname=arm \
-            ;; \
-        i686) \
-            buildarchname=i386 \
-            libarchname=i386 \
-            ;; \
-        esac && \
-        mkdir build-$arch && cd build-$arch && cmake \
-            -DCMAKE_C_COMPILER=$arch-w64-mingw32-clang \
-            -DCMAKE_SYSTEM_NAME=Windows \
-            -DCMAKE_AR=$TOOLCHAIN_PREFIX/bin/llvm-ar \
-            -DCMAKE_RANLIB=$TOOLCHAIN_PREFIX/bin/llvm-ranlib \
-            -DCMAKE_C_COMPILER_WORKS=1 \
-            -DCMAKE_C_COMPILER_TARGET=$buildarchname-windows-gnu \
-            -DCOMPILER_RT_DEFAULT_TARGET_ONLY=TRUE \
-            ../lib/builtins && \
-        make -j$CORES && \
-        mkdir -p $TOOLCHAIN_PREFIX/lib/clang/6.0.0/lib/windows && \
-        cp lib/windows/libclang_rt.builtins-$buildarchname.a $TOOLCHAIN_PREFIX/lib/clang/6.0.0/lib/windows/libclang_rt.builtins-$libarchname.a && \
-        cd .. || exit 1; \
-    done
+WORKDIR /build
+ENV PATH=$TOOLCHAIN_PREFIX/bin:$PATH
 
-RUN git clone -b master https://github.com/llvm-mirror/libcxx.git && \
-    git clone -b master https://github.com/llvm-mirror/libcxxabi.git && \
-    git clone -b master https://github.com/llvm-mirror/libunwind.git && \
-    cd libcxx && \
-    git checkout 16eb426933cdb1c54fd6fbba5fc06cc5a4ca52b3 && \
-    cd ../libcxxabi && \
-    git checkout 05ba3281482304ae8de31123a594972a495da06d && \
-    cd ../libunwind && \
-    git checkout 2ddcf2461daa5d61c543474aed06b12a8b9ad816
-
-COPY merge_archives.sh /build
-RUN cd libunwind && \
-    for arch in $TOOLCHAIN_ARCHS; do \
-        mkdir build-$arch && cd build-$arch && cmake \
-            -DCMAKE_BUILD_TYPE=Release \
-            -DCMAKE_INSTALL_PREFIX=$TOOLCHAIN_PREFIX/$arch-w64-mingw32 \
-            -DCMAKE_C_COMPILER=$arch-w64-mingw32-clang \
-            -DCMAKE_CXX_COMPILER=$arch-w64-mingw32-clang++ \
-            -DCMAKE_CROSSCOMPILING=TRUE \
-            -DCMAKE_SYSTEM_NAME=Windows \
-            -DCMAKE_C_COMPILER_WORKS=TRUE \
-            -DCMAKE_CXX_COMPILER_WORKS=TRUE \
-            -DCMAKE_AR=$TOOLCHAIN_PREFIX/bin/llvm-ar \
-            -DCMAKE_RANLIB=$TOOLCHAIN_PREFIX/bin/llvm-ranlib \
-            -DLLVM_NO_OLD_LIBSTDCXX=TRUE \
-            -DCXX_SUPPORTS_CXX11=TRUE \
-            -DLIBUNWIND_USE_COMPILER_RT=TRUE \
-            -DLIBUNWIND_ENABLE_THREADS=TRUE \
-            -DLIBUNWIND_ENABLE_SHARED=FALSE \
-            -DLIBUNWIND_ENABLE_CROSS_UNWINDING=FALSE \
-            -DCMAKE_CXX_FLAGS="-I/build/libcxx/include" \
-            .. && \
-        make -j$CORES && make install && \
-        /build/merge_archives.sh \
-            $TOOLCHAIN_PREFIX/$arch-w64-mingw32/lib/libunwind.a \
-            $TOOLCHAIN_PREFIX/$arch-w64-mingw32/lib/libpsapi.a && \
-        cd .. || exit 1; \
-    done
-
-RUN cd libcxxabi && \
-    for arch in $TOOLCHAIN_ARCHS; do \
-        mkdir build-$arch && cd build-$arch && cmake \
-            -DCMAKE_BUILD_TYPE=Release \
-            -DCMAKE_INSTALL_PREFIX=$TOOLCHAIN_PREFIX/$arch-w64-mingw32 \
-            -DCMAKE_C_COMPILER=$arch-w64-mingw32-clang \
-            -DCMAKE_CXX_COMPILER=$arch-w64-mingw32-clang++ \
-            -DCMAKE_CROSSCOMPILING=TRUE \
-            -DCMAKE_SYSTEM_NAME=Windows \
-            -DCMAKE_C_COMPILER_WORKS=TRUE \
-            -DCMAKE_CXX_COMPILER_WORKS=TRUE \
-            -DCMAKE_AR=$TOOLCHAIN_PREFIX/bin/llvm-ar \
-            -DCMAKE_RANLIB=$TOOLCHAIN_PREFIX/bin/llvm-ranlib \
-            -DLIBCXXABI_USE_COMPILER_RT=ON \
-            -DLIBCXXABI_ENABLE_EXCEPTIONS=ON \
-            -DLIBCXXABI_ENABLE_THREADS=ON \
-            -DLIBCXXABI_TARGET_TRIPLE=$arch-w64-mingw32 \
-            -DLIBCXXABI_ENABLE_SHARED=OFF \
-            -DLIBCXXABI_LIBCXX_INCLUDES=../../libcxx/include \
-            -DLLVM_NO_OLD_LIBSTDCXX=TRUE \
-            -DCXX_SUPPORTS_CXX11=TRUE \
-            -DCMAKE_CXX_FLAGS="-D_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS" \
-            .. && \
-        make -j$CORES && \
-        cd .. || exit 1; \
-    done
-
-RUN cd libcxx && \
-    for arch in $TOOLCHAIN_ARCHS; do \
-        mkdir build-$arch && cd build-$arch && cmake \
-            -DCMAKE_BUILD_TYPE=Release \
-            -DCMAKE_INSTALL_PREFIX=$TOOLCHAIN_PREFIX/$arch-w64-mingw32 \
-            -DCMAKE_C_COMPILER=$arch-w64-mingw32-clang \
-            -DCMAKE_CXX_COMPILER=$arch-w64-mingw32-clang++ \
-            -DCMAKE_CROSSCOMPILING=TRUE \
-            -DCMAKE_SYSTEM_NAME=Windows \
-            -DCMAKE_C_COMPILER_WORKS=TRUE \
-            -DCMAKE_CXX_COMPILER_WORKS=TRUE \
-            -DCMAKE_AR=$TOOLCHAIN_PREFIX/bin/llvm-ar \
-            -DCMAKE_RANLIB=$TOOLCHAIN_PREFIX/bin/llvm-ranlib \
-            -DLIBCXX_USE_COMPILER_RT=ON \
-            -DLIBCXX_INSTALL_HEADERS=ON \
-            -DLIBCXX_ENABLE_EXCEPTIONS=ON \
-            -DLIBCXX_ENABLE_THREADS=ON \
-            -DLIBCXX_HAS_WIN32_THREAD_API=ON \
-            -DLIBCXX_ENABLE_MONOTONIC_CLOCK=ON \
-            -DLIBCXX_ENABLE_SHARED=OFF \
-            -DLIBCXX_SUPPORTS_STD_EQ_CXX11_FLAG=TRUE \
-            -DLIBCXX_HAVE_CXX_ATOMICS_WITHOUT_LIB=TRUE \
-            -DLIBCXX_ENABLE_EXPERIMENTAL_LIBRARY=OFF \
-            -DLIBCXX_ENABLE_FILESYSTEM=OFF \
-            -DLIBCXX_ENABLE_STATIC_ABI_LIBRARY=TRUE \
-            -DLIBCXX_CXX_ABI=libcxxabi \
-            -DLIBCXX_CXX_ABI_INCLUDE_PATHS=../../libcxxabi/include \
-            -DLIBCXX_CXX_ABI_LIBRARY_PATH=../../libcxxabi/build-$arch/lib \
-            -DCMAKE_CXX_FLAGS="-D_LIBCXXABI_DISABLE_VISIBILITY_ANNOTATIONS" \
-            .. && \
-        make -j$CORES && make install && \
-        /build/merge_archives.sh \
-            $TOOLCHAIN_PREFIX/$arch-w64-mingw32/lib/libc++.a \
-            $TOOLCHAIN_PREFIX/$arch-w64-mingw32/lib/libunwind.a && \
-        cd .. || exit 1; \
-    done
-
-RUN cd $TOOLCHAIN_PREFIX/include && ln -s ../$(echo $TOOLCHAIN_ARCHS | awk '{print $1}')-w64-mingw32/include/c++ .
-
-COPY hello.c hello.cpp hello-exception.cpp hello-tls.c /build/hello/
+COPY hello.c hello.cpp hello-exception.cpp hello-tls.c ./hello/
 RUN cd hello && \
     for arch in $TOOLCHAIN_ARCHS; do \
         $arch-w64-mingw32-clang hello.c -o hello-$arch.exe || exit 1; \
diff --git a/README.md b/README.md
index 27663c6..df734f2 100644
--- a/README.md
+++ b/README.md
@@ -21,18 +21,20 @@ the exact same goal but with a slightly different mechanism for
 building it, allowing a full from-scratch build of all components
 in one command.
 
-The only prerequisite for building is Docker; you can also follow the
-steps of the Dockerfile and build manually within a normal linux
-environment, but Docker provides reproducibility by building in a known,
-empty environment.
+The toolchain can be reproducibly built into a Docker image, or be
+built and installed in the host environment (currently only tested
+on Linux and macOS).
 
-To build, just do:
+To build and install all components, just do:
+
+    ./build-all.sh <target-dir>
+
+To build the toolchain in Docker, run:
 
     docker build .
 
-This will download and build all parts of the toolchain, and build a few
-demo apps to show and verify that the toolchain works.
-
+In addition to building the toolchain itself (just like `build-all.sh` does),
+this also builds a few demo apps to show and verify that the toolchain works.
 
 Other branches in this repo contain patches that might not have been
 merged upstream yet, and tests of building third party projects using
@@ -43,6 +45,14 @@ For building projects that need more than just specifying
 setup for providing a larger selection of the tools that GNU binutils
 normally provides, in the branch `tools`.
 
+Individual components of the toolchain can be (re)built by running
+the standalone shellscripts listed within `build-all.sh`. However, if
+the source already is checked out, no effort is made to check out a
+different version (if the build scripts have been updated to prefer
+a different version) - and likewise, if configure flags in the build-*.sh
+scripts have changed, you might need to wipe the build directory under
+each project for the new configure options to be taken into use.
+
 
 
 Status
@@ -69,32 +79,3 @@ normal GCC/binutils based MinGW.
   at the moment.
 
 Additionally, one may run into other minor differences between GCC and clang.
-
-
-Use outside of Docker
----------------------
-
-To use a similar toolchain outside of Docker, you can run the same build
-commands as the dockerfile in probably most recent linux distributions.
-The build procedure is currently only maintained as a Dockerfile, for ease
-of verification, reproducibility and ease of maintainance though.
-
-The toolchain that was built within the docker image can also be
-extracted from the image into the surrounding host environment.
-The `extract-docker.sh` script can copy out a directory from a
-built docker image, either for getting the toolchain or built test
-binaries, when given a docker tag or image id.
-
-If the `docker build` command ended with e.g.
-`Successfully built d8b13aad965a`, you can run:
-
-    ./extract-docker.sh d8b13aad965a prefix
-
-This copies the directory `prefix` (which contains the whole toolchain,
-with headers and link libraries for all four architectures) from the
-built docker image into the current directory.
-The Dockerfile currently builds in an Ubuntu 16.04 environment, so the
-extracted toolchain can at least be used in such an environment.
-
-The extracted toolchain can be used by adding `prefix/bin` to `$PATH`
-and calling e.g. `x86_64-w64-ming32-clang`.
diff --git a/build-all.sh b/build-all.sh
new file mode 100755
index 0000000..9a78baa
--- /dev/null
+++ b/build-all.sh
@@ -0,0 +1,15 @@
+#!/bin/sh
+
+set -e
+
+if [ $# -lt 1 ]; then
+    echo $0 dest
+    exit 1
+fi
+PREFIX="$1"
+
+./build-llvm.sh $PREFIX
+./install-wrappers.sh $PREFIX
+./build-mingw-w64.sh $PREFIX
+./build-compiler-rt.sh $PREFIX 6.0.0
+./build-libcxx.sh $PREFIX
diff --git a/build-compiler-rt.sh b/build-compiler-rt.sh
new file mode 100755
index 0000000..4824dc2
--- /dev/null
+++ b/build-compiler-rt.sh
@@ -0,0 +1,56 @@
+#!/bin/sh
+
+set -e
+
+if [ $# -lt 2 ]; then
+    echo $0 dest clang-version
+    exit 1
+fi
+PREFIX="$1"
+CLANG_VERSION="$2"
+export PATH=$PREFIX/bin:$PATH
+
+: ${CORES:=4}
+: ${ARCHS:=${TOOLCHAIN_ARCHS-i686 x86_64 armv7 aarch64}}
+
+if [ ! -d compiler-rt ]; then
+    git clone -b master https://github.com/llvm-mirror/compiler-rt.git
+    cd compiler-rt
+    git checkout 1d871d6cd3fed01cd50dd63e743bd2ea6e65eab6
+    cd ..
+fi
+
+# Add a symlink for i386 -> i686; we normally name the toolchain
+# i686-w64-mingw32, but due to the compiler-rt cmake peculiarities, we
+# need to refer to it as i386 at this stage.
+ln -sf i686-w64-mingw32 $PREFIX/i386-w64-mingw32
+
+cd compiler-rt
+for arch in $ARCHS; do
+    buildarchname=$arch
+    libarchname=$arch
+    case $arch in
+    armv7)
+        libarchname=arm
+        ;;
+    i686)
+        buildarchname=i386
+        libarchname=i386
+        ;;
+    esac
+    mkdir -p build-$arch
+    cd build-$arch
+    cmake \
+        -DCMAKE_C_COMPILER=$arch-w64-mingw32-clang \
+        -DCMAKE_SYSTEM_NAME=Windows \
+        -DCMAKE_AR=$PREFIX/bin/llvm-ar \
+        -DCMAKE_RANLIB=$PREFIX/bin/llvm-ranlib \
+        -DCMAKE_C_COMPILER_WORKS=1 \
+        -DCMAKE_C_COMPILER_TARGET=$buildarchname-windows-gnu \
+        -DCOMPILER_RT_DEFAULT_TARGET_ONLY=TRUE \
+        ../lib/builtins
+    make -j$CORES
+    mkdir -p $PREFIX/lib/clang/$CLANG_VERSION/lib/windows
+    cp lib/windows/libclang_rt.builtins-$buildarchname.a $PREFIX/lib/clang/$CLANG_VERSION/lib/windows/libclang_rt.builtins-$libarchname.a
+    cd ..
+done
diff --git a/build-libcxx.sh b/build-libcxx.sh
new file mode 100755
index 0000000..9b304e6
--- /dev/null
+++ b/build-libcxx.sh
@@ -0,0 +1,142 @@
+#!/bin/sh
+
+set -e
+
+if [ $# -lt 1 ]; then
+    echo $0 dest
+    exit 1
+fi
+PREFIX="$1"
+export PATH=$PREFIX/bin:$PATH
+
+: ${CORES:=4}
+: ${ARCHS:=${TOOLCHAIN_ARCHS-i686 x86_64 armv7 aarch64}}
+
+if [ ! -d libunwind ]; then
+    git clone -b master https://github.com/llvm-mirror/libunwind.git
+    cd libunwind
+    git checkout 2ddcf2461daa5d61c543474aed06b12a8b9ad816
+    cd ..
+fi
+if [ ! -d libcxxabi ]; then
+    git clone -b master https://github.com/llvm-mirror/libcxxabi.git
+    cd libcxxabi
+    git checkout 05ba3281482304ae8de31123a594972a495da06d
+    cd ..
+fi
+if [ ! -d libcxx ]; then
+    git clone -b master https://github.com/llvm-mirror/libcxx.git
+    cd libcxx
+    git checkout 16eb426933cdb1c54fd6fbba5fc06cc5a4ca52b3
+    cd ..
+fi
+
+LIBCXX=$(pwd)/libcxx
+MERGE_ARCHIVES=$(pwd)/merge_archives.sh
+
+cd libunwind
+for arch in $ARCHS; do
+    mkdir -p build-$arch
+    cd build-$arch
+    cmake \
+        -DCMAKE_BUILD_TYPE=Release \
+        -DCMAKE_INSTALL_PREFIX=$PREFIX/$arch-w64-mingw32 \
+        -DCMAKE_C_COMPILER=$arch-w64-mingw32-clang \
+        -DCMAKE_CXX_COMPILER=$arch-w64-mingw32-clang++ \
+        -DCMAKE_CROSSCOMPILING=TRUE \
+        -DCMAKE_SYSTEM_NAME=Windows \
+        -DCMAKE_C_COMPILER_WORKS=TRUE \
+        -DCMAKE_CXX_COMPILER_WORKS=TRUE \
+        -DCMAKE_AR=$PREFIX/bin/llvm-ar \
+        -DCMAKE_RANLIB=$PREFIX/bin/llvm-ranlib \
+        -DLLVM_NO_OLD_LIBSTDCXX=TRUE \
+        -DCXX_SUPPORTS_CXX11=TRUE \
+        -DLIBUNWIND_USE_COMPILER_RT=TRUE \
+        -DLIBUNWIND_ENABLE_THREADS=TRUE \
+        -DLIBUNWIND_ENABLE_SHARED=FALSE \
+        -DLIBUNWIND_ENABLE_CROSS_UNWINDING=FALSE \
+        -DCMAKE_CXX_FLAGS="-I$LIBCXX/include" \
+        ..
+    make -j$CORES
+    make install
+    # Merge libpsapi.a into the static library libunwind.a, to
+    # avoid having to specify -lpsapi when linking to it.
+    $MERGE_ARCHIVES \
+        $PREFIX/$arch-w64-mingw32/lib/libunwind.a \
+        $PREFIX/$arch-w64-mingw32/lib/libpsapi.a
+    cd ..
+done
+cd ..
+
+cd libcxxabi
+for arch in $ARCHS; do
+    mkdir -p build-$arch
+    cd build-$arch
+    cmake \
+        -DCMAKE_BUILD_TYPE=Release \
+        -DCMAKE_INSTALL_PREFIX=$PREFIX/$arch-w64-mingw32 \
+        -DCMAKE_C_COMPILER=$arch-w64-mingw32-clang \
+        -DCMAKE_CXX_COMPILER=$arch-w64-mingw32-clang++ \
+        -DCMAKE_CROSSCOMPILING=TRUE \
+        -DCMAKE_SYSTEM_NAME=Windows \
+        -DCMAKE_C_COMPILER_WORKS=TRUE \
+        -DCMAKE_CXX_COMPILER_WORKS=TRUE \
+        -DCMAKE_AR=$PREFIX/bin/llvm-ar \
+        -DCMAKE_RANLIB=$PREFIX/bin/llvm-ranlib \
+        -DLIBCXXABI_USE_COMPILER_RT=ON \
+        -DLIBCXXABI_ENABLE_EXCEPTIONS=ON \
+        -DLIBCXXABI_ENABLE_THREADS=ON \
+        -DLIBCXXABI_TARGET_TRIPLE=$arch-w64-mingw32 \
+        -DLIBCXXABI_ENABLE_SHARED=OFF \
+        -DLIBCXXABI_LIBCXX_INCLUDES=../../libcxx/include \
+        -DLLVM_NO_OLD_LIBSTDCXX=TRUE \
+        -DCXX_SUPPORTS_CXX11=TRUE \
+        -DCMAKE_CXX_FLAGS="-D_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS" \
+        ..
+    make -j$CORES
+    cd ..
+done
+cd ..
+
+cd libcxx
+for arch in $ARCHS; do
+    mkdir -p build-$arch
+    cd build-$arch
+    cmake \
+        -DCMAKE_BUILD_TYPE=Release \
+        -DCMAKE_INSTALL_PREFIX=$PREFIX/$arch-w64-mingw32 \
+        -DCMAKE_C_COMPILER=$arch-w64-mingw32-clang \
+        -DCMAKE_CXX_COMPILER=$arch-w64-mingw32-clang++ \
+        -DCMAKE_CROSSCOMPILING=TRUE \
+        -DCMAKE_SYSTEM_NAME=Windows \
+        -DCMAKE_C_COMPILER_WORKS=TRUE \
+        -DCMAKE_CXX_COMPILER_WORKS=TRUE \
+        -DCMAKE_AR=$PREFIX/bin/llvm-ar \
+        -DCMAKE_RANLIB=$PREFIX/bin/llvm-ranlib \
+        -DLIBCXX_USE_COMPILER_RT=ON \
+        -DLIBCXX_INSTALL_HEADERS=ON \
+        -DLIBCXX_ENABLE_EXCEPTIONS=ON \
+        -DLIBCXX_ENABLE_THREADS=ON \
+        -DLIBCXX_HAS_WIN32_THREAD_API=ON \
+        -DLIBCXX_ENABLE_MONOTONIC_CLOCK=ON \
+        -DLIBCXX_ENABLE_SHARED=OFF \
+        -DLIBCXX_SUPPORTS_STD_EQ_CXX11_FLAG=TRUE \
+        -DLIBCXX_HAVE_CXX_ATOMICS_WITHOUT_LIB=TRUE \
+        -DLIBCXX_ENABLE_EXPERIMENTAL_LIBRARY=OFF \
+        -DLIBCXX_ENABLE_FILESYSTEM=OFF \
+        -DLIBCXX_ENABLE_STATIC_ABI_LIBRARY=TRUE \
+        -DLIBCXX_CXX_ABI=libcxxabi \
+        -DLIBCXX_CXX_ABI_INCLUDE_PATHS=../../libcxxabi/include \
+        -DLIBCXX_CXX_ABI_LIBRARY_PATH=../../libcxxabi/build-$arch/lib \
+        -DCMAKE_CXX_FLAGS="-D_LIBCXXABI_DISABLE_VISIBILITY_ANNOTATIONS" \
+        ..
+    make -j$CORES
+    make install
+    $MERGE_ARCHIVES \
+        $PREFIX/$arch-w64-mingw32/lib/libc++.a \
+        $PREFIX/$arch-w64-mingw32/lib/libunwind.a
+    cd ..
+done
+cd ..
+
+ln -sf ../$(echo $ARCHS | awk '{print $1}')-w64-mingw32/include/c++ $PREFIX/include/c++
diff --git a/build-llvm.sh b/build-llvm.sh
new file mode 100755
index 0000000..ae0db74
--- /dev/null
+++ b/build-llvm.sh
@@ -0,0 +1,48 @@
+#!/bin/sh
+
+set -e
+
+if [ $# -lt 1 ]; then
+    echo $0 dest
+    exit 1
+fi
+PREFIX="$1"
+
+: ${CORES:=4}
+
+if [ ! -d llvm ]; then
+    # When cloning master and checking out a pinned old hash, we can't use --depth=1.
+    # Do the git-svn rebase to populate git-svn information, to make
+    # "clang --version" produce SVN based version numbers.
+    git clone -b master https://github.com/llvm-mirror/llvm.git
+    cd llvm/tools
+    git clone -b master https://github.com/llvm-mirror/clang.git
+    git clone -b master https://github.com/llvm-mirror/lld.git
+    cd ..
+    git svn init https://llvm.org/svn/llvm-project/llvm/trunk
+    git config svn-remote.svn.fetch :refs/remotes/origin/master
+    git svn rebase -l
+    git checkout c8f103e52b297f3e3e0ed1756e11373c68af3566
+    cd tools/clang
+    git svn init https://llvm.org/svn/llvm-project/cfe/trunk
+    git config svn-remote.svn.fetch :refs/remotes/origin/master
+    git svn rebase -l
+    git checkout fdd60aee9c0ea40fa0423d6e43821f53d07961d5
+    cd ../lld
+    git svn init https://llvm.org/svn/llvm-project/lld/trunk
+    git config svn-remote.svn.fetch :refs/remotes/origin/master
+    git svn rebase -l
+    git checkout f4208caae12f685c06657aa6e2b9b1eda4adcdb4
+    cd ../../..
+fi
+
+cd llvm
+mkdir -p build
+cd build
+cmake \
+    -DCMAKE_INSTALL_PREFIX="$PREFIX" \
+    -DCMAKE_BUILD_TYPE=Release \
+    -DLLVM_ENABLE_ASSERTIONS=ON \
+    -DLLVM_TARGETS_TO_BUILD="ARM;AArch64;X86" \
+    ..
+make -j$CORES install
diff --git a/build-mingw-w64.sh b/build-mingw-w64.sh
new file mode 100755
index 0000000..ac1e508
--- /dev/null
+++ b/build-mingw-w64.sh
@@ -0,0 +1,63 @@
+#!/bin/sh
+
+set -e
+
+if [ $# -lt 1 ]; then
+    echo $0 dest
+    exit 1
+fi
+PREFIX="$1"
+export PATH=$PREFIX/bin:$PATH
+
+: ${CORES:=4}
+: ${ARCHS:=${TOOLCHAIN_ARCHS-i686 x86_64 armv7 aarch64}}
+
+if [ ! -d mingw-w64 ]; then
+    git clone git://git.code.sf.net/p/mingw-w64/mingw-w64
+    cd mingw-w64
+    git checkout 66fab9591c250ade399e9fe91ceda239a735649c
+    cd ..
+fi
+
+cd mingw-w64
+
+if [ -z "$NOHEADERS" ]; then
+    # TODO: Only install if they have changed? Otherwise this forces the CRT
+    # to be rebuilt even if headers haven't changed. Currently set $NOHEADERS
+    # to skip this part.
+    cd mingw-w64-headers
+    for arch in $ARCHS; do
+        mkdir -p build-$arch
+        cd build-$arch
+        ../configure --host=$arch-w64-mingw32 --prefix=$PREFIX/$arch-w64-mingw32 \
+            --enable-secure-api --enable-idl --with-default-win32-winnt=0x600
+        make install
+        cd ..
+    done
+    cd ..
+fi
+
+cd mingw-w64-crt
+for arch in $ARCHS; do
+    mkdir -p build-$arch
+    cd build-$arch
+    case $arch in
+    armv7)
+        FLAGS="--disable-lib32 --disable-lib64 --enable-libarm32"
+        ;;
+    aarch64)
+        FLAGS="--disable-lib32 --disable-lib64 --enable-libarm64"
+        ;;
+    i686)
+        FLAGS="--enable-lib32 --disable-lib64"
+        ;;
+    x86_64)
+        FLAGS="--disable-lib32 --enable-lib64"
+        ;;
+    esac
+    CC=$arch-w64-mingw32-clang AR=llvm-ar RANLIB=llvm-ranlib DLLTOOL=llvm-dlltool \
+    ../configure --host=$arch-w64-mingw32 --prefix=$PREFIX/$arch-w64-mingw32 $FLAGS
+    make -j$CORES
+    make install
+    cd ..
+done
diff --git a/install-wrappers.sh b/install-wrappers.sh
new file mode 100755
index 0000000..7736163
--- /dev/null
+++ b/install-wrappers.sh
@@ -0,0 +1,20 @@
+#!/bin/sh
+
+set -e
+
+if [ $# -lt 1 ]; then
+    echo $0 dest
+    exit 1
+fi
+PREFIX="$1"
+
+: ${ARCHS:=${TOOLCHAIN_ARCHS-i686 x86_64 armv7 aarch64}}
+
+mkdir -p $PREFIX/bin
+cp wrappers/clang-target-wrapper $PREFIX/bin
+cd $PREFIX/bin
+for arch in $ARCHS; do
+    for exec in clang clang++; do
+        ln -sf clang-target-wrapper $arch-w64-mingw32-$exec
+    done
+done