arm64: Initial addition

linux-arm64/Dockerfile

@@ -0,0 +1,44 @@
+FROM thewtex/cross-compiler-base
+MAINTAINER Matt McCormick "matt.mccormick@kitware.com"
+
+# Add the cross compiler sources
+RUN echo "deb http://emdebian.org/tools/debian/ jessie main" >> /etc/apt/sources.list && \
+  dpkg --add-architecture arm64 && \
+  curl http://emdebian.org/tools/debian/emdebian-toolchain-archive.key | apt-key add -
+
+RUN apt-get update && apt-get install -y \
+  crossbuild-essential-arm64 \
+  gfortran-aarch64-linux-gnu \
+  libbz2-dev:arm64 \
+  libexpat1-dev:arm64 \
+  ncurses-dev:arm64 \
+  libssl-dev:arm64
+
+WORKDIR /usr/src
+
+RUN apt-get update && \
+  apt-get install -y libglib2.0-dev zlib1g-dev libpixman-1-dev && \
+  curl -L http://wiki.qemu-project.org/download/qemu-2.5.0.tar.bz2 | tar xj && \
+  cd qemu-2.5.0 && \
+  ./configure --target-list=aarch64-linux-user --prefix=/usr && \
+  make -j$(nproc) && \
+  make install && \
+  cd .. && rm -rf qemu-2.5.0
+
+ENV CROSS_TRIPLE aarch64-linux-gnu
+ENV CROSS_ROOT /usr/${CROSS_TRIPLE}
+ENV AS=/usr/bin/${CROSS_TRIPLE}-as \
+    AR=/usr/bin/${CROSS_TRIPLE}-ar \
+    CC=/usr/bin/${CROSS_TRIPLE}-gcc \
+    CPP=/usr/bin/${CROSS_TRIPLE}-cpp \
+    CXX=/usr/bin/${CROSS_TRIPLE}-g++ \
+    LD=/usr/bin/${CROSS_TRIPLE}-ld
+
+ENV DEFAULT_DOCKCROSS_IMAGE thewtex/cross-compiler-linux-arm64
+WORKDIR /build
+
+# Note: Toolchain file support is currently in debian Experimental according to:
+# https://wiki.debian.org/CrossToolchains#In_jessie_.28Debian_8.29
+# We can switch to that when it becomes stable.
+COPY Toolchain.cmake /usr/lib/${CROSS_TRIPLE}/
+ENV CMAKE_TOOLCHAIN_FILE /usr/lib/${CROSS_TRIPLE}/Toolchain.cmake