stm32f4: build: add a Dockerfile based on Alpine Linux 3.5

Take the relevant parts of the toolchain build script from [1] and put
them into a Dockerfile. Work around Docker issue #9314 [2] by fetching
the newlib archive via `curl` instead of using the ADD instruction.

Add gdb dependencies expat-dev, ncurses-dev, python-dev and xz-dev.

[1] https://github.com/istarc/stm32/blob/master/build-ARM-toolchain/build.sh
[2] moby/moby#9314

stm32/Dockerfile

@@ -0,0 +1,118 @@
+FROM alpine:3.5
+MAINTAINER Oliver Bruns [email protected]
+
+RUN apk update && \
+    apk add --update \
+        alpine-sdk \
+        expat-dev \
+        gmp-dev \
+        mpc1-dev \
+        mpfr-dev \
+        ncurses-dev \
+        python-dev \
+        texinfo \
+        zlib-dev \
+        xz \
+        xz-dev && \
+    apk add \
+        --update-cache \
+        --repository http://dl-3.alpinelinux.org/alpine/edge/testing/ \
+        stlink
+
+ENV BINUTILS binutils-2.27
+ENV GCC gcc-6.3.0
+ENV GDB gdb-7.12.1
+ENV NEWLIB newlib-2.5.0
+ENV TARGET arm-none-eabi
+
+RUN mkdir /tmp/arm
+
+ADD https://ftp.gnu.org/gnu/binutils/${BINUTILS}.tar.bz2 /tmp/arm
+ADD https://ftp.gnu.org/gnu/gcc/${GCC}/${GCC}.tar.bz2 /tmp/arm
+ADD https://ftp.gnu.org/gnu/gdb/${GDB}.tar.xz /tmp/arm
+RUN cd /tmp/arm && \
+    curl --remote-name ftp://sourceware.org/pub/newlib/${NEWLIB}.tar.gz && \
+    tar -xjf ${BINUTILS}.tar.bz2 && \
+    tar -xjf ${GCC}.tar.bz2 && \
+    tar -xJf ${GDB}.tar.xz && \
+    tar -xzf ${NEWLIB}.tar.gz
+
+RUN cd /tmp/arm/${BINUTILS} && \
+        ./configure \
+          --target=${TARGET} \
+          --with-cpu=cortex-m4 \
+          --with-fpu=fpv4-sp-d16 \
+          --with-float=hard \
+          --with-mode=thumb \
+          --enable-interwork \
+          --enable-multilib \
+          --with-gnu-as \
+          --with-gnu-ld \
+          --disable-nls && \
+        make -j4 all && \
+        make install && \
+    cd /tmp/arm/${GCC} && \
+        mkdir build1 && cd build1 && \
+        ../configure \
+          --target=${TARGET} \
+          --with-cpu=cortex-m4 \
+          --with-fpu=fpv4-sp-d16 \
+          --with-float=hard \
+          --with-mode=thumb \
+          --enable-interwork \
+          --enable-multilib \
+          --with-system-zlib \
+          --with-newlib \
+          --without-headers \
+          --disable-shared \
+          --disable-nls \
+          --with-gnu-as \
+          --with-gnu-ld \
+          --enable-languages="c" && \
+        make -j4 all-gcc && \
+        make install-gcc && \
+    cd /tmp/arm/${NEWLIB} && \
+        ./configure \
+          --target=${TARGET} \
+          --with-cpu=cortex-m4 \
+          --with-fpu=fpv4-sp-d16 \
+          --with-float=hard \
+          --with-mode=thumb \
+          --enable-interwork \
+          --enable-multilib \
+          --disable-newlib-supplied-syscalls \
+          --with-gnu-as \
+          --with-gnu-ld \
+          --disable-nls \
+          --disable-newlib-nano-malloc && \
+        make -j4 all && \
+        make install && \
+    cd /tmp/arm/${GCC} && \
+        mkdir build2 && cd build2 && \
+        ../configure \
+          --target=$TARGET \
+          --with-cpu=cortex-m4 \
+          --with-fpu=fpv4-sp-d16 \
+          --with-float=hard \
+          --with-mode=thumb \
+          --enable-interwork \
+          --enable-interwork \
+          --enable-multilib \
+          --with-system-zlib \
+          --with-newlib \
+          --disable-shared \
+          --disable-nls \
+          --with-gnu-as \
+          --with-gnu-ld \
+          --enable-languages="c,c++" && \
+        make -j4 all && \
+        make install && \
+    cd /tmp/arm/${GDB} && \
+        ./configure --target=${TARGET} && \
+        make -j4 all && \
+        make install && \
+    rm -r /tmp/arm/${GCC} \
+        /tmp/arm/${BINUTILS} \
+        /tmp/arm/${GDB} \
+        /tmp/arm/${NEWLIB} \
+        /tmp/arm