New upstream version 2018.6

rust/vendor/libc/ci/docker/i686-unknown-linux-musl/Dockerfile

@@ -0,0 +1,30 @@
+FROM ubuntu:17.10
+
+RUN dpkg --add-architecture i386
+RUN apt-get update
+RUN apt-get install -y --no-install-recommends \
+  gcc-multilib make libc6-dev git curl ca-certificates libc6:i386
+# Below we're cross-compiling musl for i686 using the system compiler on an
+# x86_64 system. This is an awkward thing to be doing and so we have to jump
+# through a couple hoops to get musl to be happy. In particular:
+#
+# * We specifically pass -m32 in CFLAGS and override CC when running ./configure,
+#   since otherwise the script will fail to find a compiler.
+# * We manually unset CROSS_COMPILE when running make; otherwise the makefile
+#   will call the non-existent binary 'i686-ar'.
+RUN curl https://www.musl-libc.org/releases/musl-1.1.15.tar.gz | \
+    tar xzf - && \
+    cd musl-1.1.15 && \
+    CC=gcc CFLAGS=-m32 ./configure --prefix=/musl-i686 --disable-shared --target=i686 && \
+    make CROSS_COMPILE= install -j4 && \
+    cd .. && \
+    rm -rf musl-1.1.15 && \
+# Install linux kernel headers sanitized for use with musl
+    curl -L  https://github.com/sabotage-linux/kernel-headers/archive/v3.12.6-5.tar.gz | \
+    tar xzf - && \
+    cd kernel-headers-3.12.6-5 && \
+    make ARCH=i386 prefix=/musl-i686 install -j4 && \
+    cd .. && \
+    rm -rf kernel-headers-3.12.6-5
+ENV PATH=$PATH:/musl-i686/bin:/rust/bin \
+    CC_i686_unknown_linux_musl=musl-gcc