Rename Dockerfile to Dockerfile.in to ensure consistency

All Dockerfiles are now configured similarly, this will support
future improvements.

linux-armv6/Dockerfile.in

@@ -0,0 +1,63 @@
+FROM dockcross/base:latest
+MAINTAINER Matt McCormick "matt.mccormick@kitware.com"
+
+# Enable 32 bits binaries
+RUN dpkg --add-architecture i386 && \
+    apt-get update && \
+    apt-get install -y libstdc++6:i386 libgcc1:i386 zlib1g:i386
+
+# The cross-compiling emulator
+RUN apt-get update && apt-get install -y \
+  qemu-user \
+  qemu-user-static
+
+ENV CROSS_TRIPLE arm-linux-gnueabihf
+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/${CROSS_TRIPLE}-ld \
+    FC=/usr/bin/${CROSS_TRIPLE}-gfortran
+
+# Raspberry Pi is ARMv6+VFP2, Debian armhf is ARMv7+VFP3
+# Since this Dockerfile is targeting linux-arm from Raspberry Pi onward,
+# we're sticking with it's custom built cross-compiler with hardfp support.
+# We could use Debian's armel, but we'd have softfp and loose a good deal
+# of performance.
+# See: https://wiki.debian.org/RaspberryPi
+# We are also using the 4.7 version of the toolchain, so that glibc=2.13
+
+# Instead of cloning the whole repo (>1GB at the of writing this), we want to do a so-called "sparse checkout" with "shallow cloning":
+# https://stackoverflow.com/questions/600079/is-there-any-way-to-clone-a-git-repositorys-sub-directory-only/13738951#13738951
+
+RUN mkdir rpi_tools && cd rpi_tools && git init && git remote add -f origin https://github.com/raspberrypi/tools && \
+    git config core.sparseCheckout true && echo "arm-bcm2708/gcc-linaro-${CROSS_TRIPLE}-raspbian" >> .git/info/sparse-checkout && \
+    git pull --depth=1 origin master && rsync -av arm-bcm2708/gcc-linaro-${CROSS_TRIPLE}-raspbian/ /usr/ && rm -rf ../rpi_tools
+
+# Allow dynamically linked executables to run with qemu-arm
+ENV QEMU_LD_PREFIX ${CROSS_ROOT}/libc
+ENV QEMU_SET_ENV "LD_LIBRARY_PATH=${CROSS_ROOT}/lib:${CROSS_ROOT}/libc/lib/${CROSS_TRIPLE}/"
+
+COPY Toolchain.cmake ${CROSS_ROOT}/
+ENV CMAKE_TOOLCHAIN_FILE ${CROSS_ROOT}/Toolchain.cmake
+
+# Linux kernel cross compilation variables
+ENV PATH ${PATH}:${CROSS_ROOT}/bin
+ENV CROSS_COMPILE ${CROSS_TRIPLE}-
+ENV ARCH arm
+
+# Build-time metadata as defined at http://label-schema.org
+ARG BUILD_DATE
+ARG IMAGE
+ARG VERSION=latest
+ARG VCS_REF
+ARG VCS_URL
+LABEL org.label-schema.build-date=$BUILD_DATE \
+      org.label-schema.name=$IMAGE \
+      org.label-schema.version=$VERSION \
+      org.label-schema.vcs-ref=$VCS_REF \
+      org.label-schema.vcs-url=$VCS_URL \
+      org.label-schema.schema-version="1.0"
+ENV DEFAULT_DOCKCROSS_IMAGE ${IMAGE}:${VERSION}