Integrate dist-cloudabi into dist-various-2.

As discussed in #47427, let's not have a separate container for doing
CloudABI builds. It's a lot faster if we integrate it into an existing
container, so there's less duplication of what's being built.

Upgrade the existing container to Ubuntu 17.10, which is required for
CloudABI builds. The version of Clang shipped with 16.04 is not recent
enough to support CloudABI properly.

Author: EdSchouten

src/ci/docker/disabled/dist-cloudabi/Dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:16.04
+FROM ubuntu:17.10
 
 COPY scripts/cross-apt-packages.sh /scripts/
 RUN sh /scripts/cross-apt-packages.sh
@@ -21,9 +21,14 @@ RUN apt-key adv --batch --yes --keyserver keyserver.ubuntu.com --recv-keys 74DA7
 RUN add-apt-repository -y 'deb http://apt.dilos.org/dilos dilos2-testing main'
 
 WORKDIR /tmp
-COPY dist-various-2/shared.sh dist-various-2/build-fuchsia-toolchain.sh /tmp/
-COPY dist-various-2/build-solaris-toolchain.sh /tmp/
+COPY dist-various-2/shared.sh /tmp/
+COPY dist-various-2/build-cloudabi-toolchain.sh /tmp/
+RUN /tmp/build-cloudabi-toolchain.sh aarch64-unknown-cloudabi
+RUN /tmp/build-cloudabi-toolchain.sh i686-unknown-cloudabi
+RUN /tmp/build-cloudabi-toolchain.sh x86_64-unknown-cloudabi
+COPY dist-various-2/build-fuchsia-toolchain.sh /tmp/
 RUN /tmp/build-fuchsia-toolchain.sh
+COPY dist-various-2/build-solaris-toolchain.sh /tmp/
 RUN /tmp/build-solaris-toolchain.sh x86_64  amd64   solaris-i386
 RUN /tmp/build-solaris-toolchain.sh sparcv9 sparcv9 solaris-sparc
 
@@ -44,12 +49,30 @@ ENV \
     CC_x86_64_sun_solaris=x86_64-sun-solaris2.10-gcc \
     CXX_x86_64_sun_solaris=x86_64-sun-solaris2.10-g++
 
+# FIXME(EdSchouten): Remove this once cc ≥1.0.4 has been merged. It can
+# automatically pick the right compiler path.
+ENV \
+    AR_aarch64_unknown_cloudabi=aarch64-unknown-cloudabi-ar \
+    CC_aarch64_unknown_cloudabi=aarch64-unknown-cloudabi-clang \
+    CXX_aarch64_unknown_cloudabi=aarch64-unknown-cloudabi-clang++ \
+    AR_i686_unknown_cloudabi=i686-unknown-cloudabi-ar \
+    CC_i686_unknown_cloudabi=i686-unknown-cloudabi-clang \
+    CXX_i686_unknown_cloudabi=i686-unknown-cloudabi-clang++ \
+    AR_x86_64_unknown_cloudabi=x86_64-unknown-cloudabi-ar \
+    CC_x86_64_unknown_cloudabi=x86_64-unknown-cloudabi-clang \
+    CXX_x86_64_unknown_cloudabi=x86_64-unknown-cloudabi-clang++
+
 ENV TARGETS=x86_64-unknown-fuchsia
 ENV TARGETS=$TARGETS,aarch64-unknown-fuchsia
 ENV TARGETS=$TARGETS,sparcv9-sun-solaris
 ENV TARGETS=$TARGETS,wasm32-unknown-unknown
 ENV TARGETS=$TARGETS,x86_64-sun-solaris
 ENV TARGETS=$TARGETS,x86_64-unknown-linux-gnux32
+ENV TARGETS=$TARGETS,aarch64-unknown-cloudabi
+# FIXME(EdSchouten): Enable ARMv7 support once libc ≥0.2.37 has been merged.
+# ENV TARGETS=$TARGETS,armv7-unknown-cloudabi-eabihf
+ENV TARGETS=$TARGETS,i686-unknown-cloudabi
+ENV TARGETS=$TARGETS,x86_64-unknown-cloudabi
 
 ENV RUST_CONFIGURE_ARGS --target=$TARGETS --enable-extended
 ENV SCRIPT python2.7 ../x.py dist --target $TARGETS

src/ci/docker/dist-various-2/Dockerfile

@@ -31,29 +31,25 @@ apt-get install -y --no-install-recommends \
 
 # Set up a Clang-based cross compiler toolchain.
 # Based on the steps described at https://nuxi.nl/cloudabi/debian/
-IFS=,
-for target in ${TARGETS}; do
-  for tool in ar nm objdump ranlib size; do
-    ln -s ../lib/llvm-5.0/bin/llvm-${tool} /usr/bin/${target}-${tool}
-  done
-  ln -s ../lib/llvm-5.0/bin/clang /usr/bin/${target}-cc
-  ln -s ../lib/llvm-5.0/bin/clang /usr/bin/${target}-c++
-  ln -s ../lib/llvm-5.0/bin/lld /usr/bin/${target}-ld
-  ln -s ../../${target} /usr/lib/llvm-5.0/${target}
-
-  # FIXME(EdSchouten): Remove this once cc ≥1.0.4 has been merged. It
-  # can make use of ${target}-cc and ${target}-c++, without incorrectly
-  # assuming it's MSVC.
-  ln -s ../lib/llvm-5.0/bin/clang /usr/bin/${target}-clang
-  ln -s ../lib/llvm-5.0/bin/clang /usr/bin/${target}-clang++
+target=$1
+for tool in ar nm objdump ranlib size; do
+  ln -s ../lib/llvm-5.0/bin/llvm-${tool} /usr/bin/${target}-${tool}
 done
+ln -s ../lib/llvm-5.0/bin/clang /usr/bin/${target}-cc
+ln -s ../lib/llvm-5.0/bin/clang /usr/bin/${target}-c++
+ln -s ../lib/llvm-5.0/bin/lld /usr/bin/${target}-ld
+ln -s ../../${target} /usr/lib/llvm-5.0/${target}
+
+# FIXME(EdSchouten): Remove this once cc ≥1.0.4 has been merged. It
+# can make use of ${target}-cc and ${target}-c++, without incorrectly
+# assuming it's MSVC.
+ln -s ../lib/llvm-5.0/bin/clang /usr/bin/${target}-clang
+ln -s ../lib/llvm-5.0/bin/clang /usr/bin/${target}-clang++
 
 # Install the C++ runtime libraries from CloudABI Ports.
 echo deb https://nuxi.nl/distfiles/cloudabi-ports/debian/ cloudabi cloudabi > \
     /etc/apt/sources.list.d/cloudabi.list
 curl 'https://pgp.mit.edu/pks/lookup?op=get&search=0x0DA51B8531344B15' | \
     apt-key add -
 apt-get update
-for target in ${TARGETS}; do
-  apt-get install -y $(echo ${target} | sed -e s/_/-/g)-cxx-runtime
-done
+apt-get install -y $(echo ${target} | sed -e s/_/-/g)-cxx-runtime