Add support for armel (ARMv5), ppc64el (IBM POWER 8), and s390x (IBM z Systems)

This required updating to Ubuntu Xenial for some of the cross compilers, but Travis doesn't support Xenial builders, so this instead converts Travis to use the already-existing "ddist.sh" script for building via Docker.

.travis.yml

@@ -1,5 +1,6 @@
 sudo: required
-dist: trusty
+services:
+  - docker
 
 language: generic
 
@@ -7,22 +8,23 @@ env:
   matrix:
     - CC=gcc ARCH_SUFFIX= ARCH_NATIVE=1 MINIMAL=
     - CC=gcc ARCH_SUFFIX=amd64 ARCH_NATIVE=1 MINIMAL=
+    - CC=arm-linux-gnueabi-gcc ARCH_SUFFIX=armel ARCH_NATIVE= MINIMAL=
     - CC=arm-linux-gnueabihf-gcc ARCH_SUFFIX=armhf ARCH_NATIVE= MINIMAL=
     - CC=aarch64-linux-gnu-gcc ARCH_SUFFIX=arm64 ARCH_NATIVE= MINIMAL=
     - CFLAGS="-m32" ARCH_SUFFIX=i386 ARCH_NATIVE= MINIMAL=
+    - CC=powerpc64le-linux-gnu-gcc ARCH_SUFFIX=ppc64el ARCH_NATIVE= MINIMAL=
+    - CC=s390x-linux-gnu-gcc ARCH_SUFFIX=s390x ARCH_NATIVE= MINIMAL=
     - CC=musl-gcc ARCH_SUFFIX=muslc-amd64 ARCH_NATIVE=1 MINIMAL=
     - CC=gcc ARCH_SUFFIX=amd64 ARCH_NATIVE=1 MINIMAL=1
   global:
-    - SIGN_BINARIES=1
     - secure: "RKF9Z9gLxp6k/xITqn7ma1E9HfpYcDXuJFf4862WeH9EMnK9lDq+TWnGsQfkIlqh8h9goe7U+BvRiTibj9MiD5u7eluLo3dlwsLxPpYtyswYeLeC1wKKdT5LPGAXbRKomvBalRYMI+dDnGIM4w96mHgGGvx2zZXGkiAQhm6fJ3k="
-    - DIST_DIR="${HOME}/up"
+    - DIST_DIR="${PWD}/dist"
 
 before_install:
   - openssl aes-256-cbc -K $encrypted_2893fd5649e7_key -iv $encrypted_2893fd5649e7_iv -in sign.key.enc -out sign.key -d || echo "Encrypted signing key unavailable"
 
 script:
-  - sudo ./ci/install_deps.sh
-  - ./ci/run_build.sh
+  - ./ddist.sh "$ARCH_SUFFIX"
   - ls -lah "$DIST_DIR"
   - git diff --exit-code
 

Dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:trusty
+FROM ubuntu:xenial
 
 ARG ARCH_SUFFIX
 

ci/install_deps.sh

@@ -4,17 +4,23 @@ set -o nounset
 set -o xtrace
 
 DEPS=(
-  build-essential git gdb valgrind cmake rpm \
-  python-dev libcap-dev python-pip python-virtualenv \
+  build-essential git gdb valgrind cmake rpm file
+  libcap-dev python-dev python-pip python-setuptools
   hardening-includes gnupg
 )
 
 if [[ -z "${ARCH_SUFFIX-}" ]] || [[ "$ARCH_SUFFIX" = "amd64" ]]; then
   true
+elif [[ "$ARCH_SUFFIX" = "armel" ]]; then
+  DEPS+=(gcc-arm-linux-gnueabi binutils-arm-linux-gnueabi libc6-dev-armel-cross)
 elif [[ "$ARCH_SUFFIX" = "armhf" ]]; then
-  DEPS+=(gcc-arm-linux-gnueabihf binutils-arm-linux-gnueabi libc6-dev-armhf-cross)
+  DEPS+=(gcc-arm-linux-gnueabihf binutils-arm-linux-gnueabihf libc6-dev-armhf-cross)
 elif [[ "$ARCH_SUFFIX" = "arm64" ]]; then
   DEPS+=(gcc-aarch64-linux-gnu binutils-aarch64-linux-gnu libc6-dev-arm64-cross)
+elif [[ "$ARCH_SUFFIX" = "ppc64el" ]]; then
+  DEPS+=(gcc-powerpc64le-linux-gnu binutils-powerpc64le-linux-gnu libc6-dev-ppc64el-cross)
+elif [[ "$ARCH_SUFFIX" = "s390x" ]]; then
+  DEPS+=(gcc-s390x-linux-gnu binutils-s390x-linux-gnu libc6-dev-s390x-cross)
 elif [[ "$ARCH_SUFFIX" = "i386" ]]; then
   DEPS+=(libc6-dev-i386  gcc-multilib)
 elif [[ "$ARCH_SUFFIX" = "muslc-amd64" ]]; then
@@ -27,3 +33,5 @@ fi
 apt-get update
 apt-get install --no-install-recommends --yes "${DEPS[@]}"
 rm -rf /var/lib/apt/lists/*
+
+pip install virtualenv

ddist.sh

@@ -29,7 +29,8 @@ docker run -it --rm \
   -e GPG_PASSPHRASE="${GPG_PASSPHRASE:=}" \
   -e CC="${CC:=gcc}" \
   -e CFLAGS="${CFLAGS-}" \
-  -e ARCH_NATIVE="${ARCH_NATIVE-1}" \
+  -e ARCH_NATIVE="${ARCH_NATIVE-}" \
   -e ARCH_SUFFIX="${suffix}" \
   -e MINIMAL="${MINIMAL-}" \
+  -u "$(id -u):$(id -g)" \
   "${IMG}" "${SRC}/ci/run_build.sh"