mk: Switch rustbuild to the default build system

This commit switches the default build system for Rust from the makefiles to
rustbuild. The rustbuild build system has been in development for almost a year
now and has become quite mature over time. This commit is an implementation of
the proposal on [internals] which slates deletion of the makefiles on
2016-01-02.

[internals]: https://internals.rust-lang.org/t/proposal-for-promoting-rustbuild-to-official-status/4368

This commit also updates various documentation in `README.md`,
`CONTRIBUTING.md`, `src/bootstrap/README.md`, and throughout the source code of
rustbuild itself.

Closes #37858

8 files changed, 16 insertions, 17 deletions

diff --git a/src/ci/docker/arm-android/Dockerfile b/src/ci/docker/arm-android/Dockerfile
index c5b70c227c4..121c0263cbc 100644
--- a/src/ci/docker/arm-android/Dockerfile
+++ b/src/ci/docker/arm-android/Dockerfile
@@ -9,7 +9,6 @@ RUN dpkg --add-architecture i386 && \
   curl \
   ca-certificates \
   python2.7 \
-  python-minimal \
   git \
   cmake \
   ccache \
@@ -39,8 +38,7 @@ ENV RUST_CONFIGURE_ARGS \
       --arm-linux-androideabi-ndk=/android/ndk-arm-9 \
       --armv7-linux-androideabi-ndk=/android/ndk-arm-9 \
       --i686-linux-android-ndk=/android/ndk-x86-9 \
-      --aarch64-linux-android-ndk=/android/ndk-aarch64 \
-      --enable-rustbuild
-ENV RUST_CHECK_TARGET check-stage2-android
+      --aarch64-linux-android-ndk=/android/ndk-aarch64
+ENV XPY_CHECK test --target arm-linux-androideabi
 RUN mkdir /tmp/obj
 RUN chmod 777 /tmp/obj
diff --git a/src/ci/docker/cross/Dockerfile b/src/ci/docker/cross/Dockerfile
index d8af878a958..b7b23d74c9d 100644
--- a/src/ci/docker/cross/Dockerfile
+++ b/src/ci/docker/cross/Dockerfile
@@ -7,7 +7,6 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   curl \
   ca-certificates \
   python2.7 \
-  python-minimal \
   git \
   cmake \
   ccache \
diff --git a/src/ci/docker/run.sh b/src/ci/docker/run.sh
index c5b1d00fb7c..ff5345d3aac 100755
--- a/src/ci/docker/run.sh
+++ b/src/ci/docker/run.sh
@@ -19,17 +19,21 @@ ci_dir="`dirname $docker_dir`"
 src_dir="`dirname $ci_dir`"
 root_dir="`dirname $src_dir`"
 
-docker build \
+docker \
+  build \
   --rm \
   -t rust-ci \
   "`dirname "$script"`/$image"
 
 mkdir -p $HOME/.ccache
 mkdir -p $HOME/.cargo
+mkdir -p $root_dir/obj
 
-exec docker run \
+exec docker \
+  run \
   --volume "$root_dir:/checkout:ro" \
-  --workdir /tmp/obj \
+  --volume "$root_dir/obj:/checkout/obj" \
+  --workdir /checkout/obj \
   --env SRC=/checkout \
   --env CCACHE_DIR=/ccache \
   --volume "$HOME/.ccache:/ccache" \
diff --git a/src/ci/docker/x86_64-freebsd/Dockerfile b/src/ci/docker/x86_64-freebsd/Dockerfile
index dc16c39961c..a3a52f9e6ff 100644
--- a/src/ci/docker/x86_64-freebsd/Dockerfile
+++ b/src/ci/docker/x86_64-freebsd/Dockerfile
@@ -7,7 +7,6 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   curl \
   ca-certificates \
   python2.7 \
-  python-minimal \
   git \
   cmake \
   ccache \
@@ -23,7 +22,7 @@ ENV \
     AR_x86_64_unknown_freebsd=x86_64-unknown-freebsd10-ar \
     CC_x86_64_unknown_freebsd=x86_64-unknown-freebsd10-gcc
 
-ENV RUST_CONFIGURE_ARGS --target=x86_64-unknown-freebsd --enable-rustbuild
+ENV RUST_CONFIGURE_ARGS --target=x86_64-unknown-freebsd
 ENV RUST_CHECK_TARGET ""
 RUN mkdir /tmp/obj
 RUN chmod 777 /tmp/obj
diff --git a/src/ci/docker/x86_64-gnu-cargotest/Dockerfile b/src/ci/docker/x86_64-gnu-cargotest/Dockerfile
index 1db01f2b48d..107e2bf8a12 100644
--- a/src/ci/docker/x86_64-gnu-cargotest/Dockerfile
+++ b/src/ci/docker/x86_64-gnu-cargotest/Dockerfile
@@ -7,14 +7,14 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   curl \
   ca-certificates \
   python2.7 \
-  python-minimal \
   git \
   cmake \
   ccache \
   libssl-dev \
   sudo
 
-ENV RUST_CONFIGURE_ARGS --build=x86_64-unknown-linux-gnu --enable-rustbuild
+ENV RUST_CONFIGURE_ARGS --build=x86_64-unknown-linux-gnu
 ENV RUST_CHECK_TARGET check-cargotest
+ENV NO_VENDOR 1
 RUN mkdir /tmp/obj
 RUN chmod 777 /tmp/obj
diff --git a/src/ci/docker/x86_64-gnu-llvm-3.7/Dockerfile b/src/ci/docker/x86_64-gnu-llvm-3.7/Dockerfile
index ca06940ae5e..c27e3d1325f 100644
--- a/src/ci/docker/x86_64-gnu-llvm-3.7/Dockerfile
+++ b/src/ci/docker/x86_64-gnu-llvm-3.7/Dockerfile
@@ -7,7 +7,6 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   curl \
   ca-certificates \
   python2.7 \
-  python2.7-minimal \
   git \
   cmake \
   ccache \
@@ -19,7 +18,6 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 
 ENV RUST_CONFIGURE_ARGS \
       --build=x86_64-unknown-linux-gnu \
-      --enable-rustbuild \
       --llvm-root=/usr/lib/llvm-3.7
 ENV RUST_CHECK_TARGET check
 RUN mkdir /tmp/obj
diff --git a/src/ci/docker/x86_64-gnu-rustbuild/Dockerfile b/src/ci/docker/x86_64-gnu-make/Dockerfile
index d4d0492e2a2..93229b2a010 100644
--- a/src/ci/docker/x86_64-gnu-rustbuild/Dockerfile
+++ b/src/ci/docker/x86_64-gnu-make/Dockerfile
@@ -7,14 +7,13 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   curl \
   ca-certificates \
   python2.7 \
-  python-minimal \
   git \
   cmake \
   ccache \
   sudo \
   gdb
 
-ENV RUST_CONFIGURE_ARGS --build=x86_64-unknown-linux-gnu --enable-rustbuild
+ENV RUST_CONFIGURE_ARGS --build=x86_64-unknown-linux-gnu --disable-rustbuild
 ENV RUST_CHECK_TARGET check
 RUN mkdir /tmp/obj
 RUN chmod 777 /tmp/obj
diff --git a/src/ci/docker/x86_64-musl/Dockerfile b/src/ci/docker/x86_64-musl/Dockerfile
index 1afaef2e056..967940fb1f3 100644
--- a/src/ci/docker/x86_64-musl/Dockerfile
+++ b/src/ci/docker/x86_64-musl/Dockerfile
@@ -20,8 +20,10 @@ RUN sh /build/build-musl.sh && rm -rf /build
 
 ENV RUST_CONFIGURE_ARGS \
       --target=x86_64-unknown-linux-musl \
-      --musl-root=/musl-x86_64
+      --musl-root-x86_64=/musl-x86_64
 ENV RUST_CHECK_TARGET check-stage2-T-x86_64-unknown-linux-musl-H-x86_64-unknown-linux-gnu
+ENV PATH=$PATH:/musl-x86_64/bin
+ENV XPY_CHECK test --target x86_64-unknown-linux-musl
 
 RUN mkdir /tmp/obj
 RUN chmod 777 /tmp/obj