Dockerfile

FROM alpine:3.4

ENV RUST_VERSION 1.9.0

RUN apk add --no-cache 'curl'
# TODO: Verify download.
RUN curl -LOsS https://static.rust-lang.org/dist/rustc-${RUST_VERSION}-src.tar.gz \
  && ls -l \
  && tar -xzvf rustc-${RUST_VERSION}-src.tar.gz \
  && cd rustc-${RUST_VERSION}/ \
  && sed -i -e 's/v3\.4/edge/g' /etc/apk/repositories \
  && apk add --no-cache --virtual '.build-deps' \
      'tree' \
      'python' \
      'file' \
      'make' \
      'g++' \
      'llvm-dev' \
      'musl-dev' \
      'libunwind-dev' \
      'libc6-compat' \
      'llvm-libs' \
      'llvm-static' \
      'zlib-dev' \
      'libffi-dev'

RUN curl -LsSo /glibc.tar.xz https://www.archlinux.org/packages/core/x86_64/glibc/download/ \
  && mkdir /glibc \
  && tar xvf /glibc.tar.xz -C /glibc

ADD glibc.patch /glibc.patch
ADD libpath.patch /libpath.patch
ADD ffi.patch /ffi.patch

RUN cd rustc-${RUST_VERSION}/ \
  # HACK: needed to run stage0 in Alpine
  && patch -p0 < /glibc.patch \
  && patch -p0 < /libpath.patch \
  # Needed when using --llvm-root
  && patch -p0 < /ffi.patch \
  && ./configure --disable-docs --disable-codegen-tests --disable-jemalloc --enable-dist-host-only --enable-llvm-static-stdcpp --llvm-root=/usr --prefix=/usr

RUN cd rustc-${RUST_VERSION}/ \
  # HACK: build stage1 from a glibc stage0
  && LD_LIBRARY_PATH=/glibc/usr/lib:/lib make -j8 rustc-stage1
  #&& make -j4 install

RUN cd rustc-${RUST_VERSION}/ \
  && LD_LIBRARY_PATH=/glibc/usr/lib:/lib make -j8 install

ffi.patch

--- src/librustc_llvm/lib.rs.old
+++ src/librustc_llvm/lib.rs
@@ -565,6 +565,7 @@
 // automatically updated whenever LLVM is updated to include an up-to-date
 // set of the libraries we need to link to LLVM for.
 #[link(name = "rustllvm", kind = "static")]
+#[link(name = "ffi")]
 #[cfg(not(cargobuild))]
 extern {}

glibc.patch

--- mk/main.mk.old
+++ mk/main.mk
@@ -461,7 +461,7 @@
 
 ifeq ($(1),0)
 # Don't run the stage0 compiler under valgrind - that ship has sailed
-CFG_VALGRIND_COMPILE$(1) =
+CFG_VALGRIND_COMPILE$(1) = /glibc/usr/lib/ld-2.23.so
 else
 CFG_VALGRIND_COMPILE$(1) = $$(CFG_VALGRIND_COMPILE)
 endif

libpath.patch

--- mk/main.mk.old
+++ mk/main.mk
@@ -179,6 +179,7 @@
 # have to worry about the distribution of one file (with its native dynamic
 # dependencies)
 RUSTFLAGS_STAGE0 += -C prefer-dynamic -C no-stack-check
+RUSTFLAGS_STAGE0 += -L x86_64-unknown-linux-gnu/stage0/lib/rustlib/x86_64-unknown-linux-gnu/lib
 RUSTFLAGS_STAGE1 += -C prefer-dynamic
 RUST_LIB_FLAGS_ST2 += -C prefer-dynamic
 RUST_LIB_FLAGS_ST3 += -C prefer-dynamic