Test travis cross compilation

.travis.yml

@@ -1,16 +1,28 @@
-sudo: required
 language: c
 
-os:
+sudo: false
-  - linux
-  - osx
 
-compiler:
+cache:
-  - clang
+  directories:
-  - gcc
+    - $HOME/qemu
+
+matrix:
+  include:
+  - os: linux
+    compiler: gcc
+  - os: linux
+    compiler: clang
+  - os: osx
+    compiler: gcc
+  - os: osx
+    compiler: clang
+  - os: linux
+    env:
+      CROSS_COMPILE=1
+      TOOLCHAIN_NAME=gcc-linaro-7.2.1-2017.11-x86_64_arm-linux-gnueabihf
+      TARGET=arm-linux-gnueabihf
+      QEMU_ARCH=arm
 
 script:
   - cmake --version
-  - cmake -DCMAKE_BUILD_TYPE=Debug -DBUILD_TESTING=ON -H. -Bcmake_build
+  - bash -e -x ./scripts/run_integration.sh
-  - cmake --build cmake_build --target all
-  - CTEST_OUTPUT_ON_FAILURE=1 cmake --build cmake_build --target test

cmake/arm-linux-gnueabihf.cmake

@@ -0,0 +1,18 @@
+SET(CMAKE_SYSTEM_NAME Linux)
+SET(CMAKE_SYSTEM_VERSION 1)
+
+# specify the cross compiler
+SET(CMAKE_C_COMPILER   arm-linux-gnueabihf-gcc -mfloat-abi=hard)
+SET(CMAKE_CXX_COMPILER arm-linux-gnueabihf-g++ -mfloat-abi=hard)
+SET(CMAKE_AR arm-linux-gnueabihf-ar CACHE FILEPATH "Archiver")
+
+SET(THREADS_PTHREAD_ARG "2" CACHE STRING "Forcibly set by CMakeLists.txt." FORCE)
+
+# where is the target environment
+SET(CMAKE_FIND_ROOT_PATH  $ENV{TOOLCHAIN})
+
+# search for programs in the build host directories
+SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+# for libraries and headers in the target directories
+SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)

scripts/run_integration.sh

@@ -0,0 +1,47 @@
+#!/bin/bash
+
+export BUILD_DIR=cmake_build
+export CMAKE_ARGS="-DCMAKE_BUILD_TYPE=Debug -DBUILD_TESTING=ON -H. -B${BUILD_DIR}"
+
+SCRIPT_FOLDER=$(cd -P -- "$(dirname -- "$0")" && pwd -P)
+PROJECT_FOLDER=${SCRIPT_FOLDER}/..
+cd ${PROJECT_FOLDER}
+
+if [[ -n "${CROSS_COMPILE}" ]]; then
+  # Cross compilation
+  : "${TOOLCHAIN_NAME:?Need to set TOOLCHAIN_NAME non-empty}"
+  : "${TARGET:?Need to set TARGET non-empty}"
+  : "${QEMU_ARCH:?Need to set QEMU_ARCH non-empty}"
+  ${SCRIPT_FOLDER}/setup_qemu.sh
+  ${SCRIPT_FOLDER}/setup_toolchain.sh
+  export TOOLCHAIN=${HOME}/${TOOLCHAIN_NAME}
+  export PATH=${TOOLCHAIN}/bin:${HOME}/qemu/bin:${PATH}
+  export CMAKE_TOOLCHAIN_FILE=cmake/${TARGET}.cmake
+  if [[ ! -f ${CMAKE_TOOLCHAIN_FILE} ]]; then
+      echo "Missing cmake toolchain file : $CMAKE_TOOLCHAIN_FILE"
+      exit 1
+  fi
+  # Generate makefile
+  cmake ${CMAKE_ARGS} -DCMAKE_TOOLCHAIN_FILE=${CMAKE_TOOLCHAIN_FILE}
+  # Compile
+  cmake --build ${BUILD_DIR} --target all
+  # Run tests
+  export QEMU=qemu-${QEMU_ARCH}
+  export QEMU_LD_PREFIX=${TOOLCHAIN}/${TARGET}/libc
+  export LD_LIBRARY_PATH=${TOOLCHAIN}/${TARGET}/libc
+  for test_binary in ${BUILD_DIR}/test/*_test; do
+    ${QEMU} ${test_binary}
+  done
+  # Run demo program
+  ${QEMU} ${BUILD_DIR}/list_cpu_features
+else
+  # Native compilation
+  # Generate makefile
+  cmake ${CMAKE_ARGS}
+  # Compile
+  cmake --build ${BUILD_DIR} --target all
+  # Run tests
+  CTEST_OUTPUT_ON_FAILURE=1 cmake --build ${BUILD_DIR} --target test
+  # Run demo program
+  ${BUILD_DIR}/list_cpu_features
+fi

scripts/setup_qemu.sh

@@ -0,0 +1,40 @@
+#!/bin/bash
+
+set -e
+
+VERSION=${QEMU_VERSION:=2.11.0}
+ARCHES=${QEMU_ARCHES:=arm aarch64 i386 x86_64 mipsel}
+TARGETS=${QEMU_TARGETS:=$(echo $ARCHES | sed 's#$# #;s#\([^ ]*\) #\1-softmmu \1-linux-user #g')}
+
+if echo "$VERSION $TARGETS" | cmp --silent $HOME/qemu/.build -; then
+  echo "qemu $VERSION up to date!"
+  exit 0
+fi
+
+echo "VERSION: $VERSION"
+echo "TARGETS: $TARGETS"
+
+cd $HOME
+rm -rf qemu
+
+# Checking for a tarball before downloading makes testing easier :-)
+test -f "qemu-$VERSION.tar.xz" || wget "http://wiki.qemu-project.org/download/qemu-$VERSION.tar.xz"
+tar -xJf "qemu-$VERSION.tar.xz"
+cd "qemu-$VERSION"
+
+./configure \
+  --prefix="$HOME/qemu" \
+  --target-list="$TARGETS" \
+  --disable-docs \
+  --disable-sdl \
+  --disable-gtk \
+  --disable-gnutls \
+  --disable-gcrypt \
+  --disable-nettle \
+  --disable-curses \
+  --static
+
+make -j4
+make install
+
+echo "$VERSION $TARGETS" > $HOME/qemu/.build

scripts/setup_toolchain.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+set -e
+
+: "${TOOLCHAIN_NAME:?Need to set TOOLCHAIN_NAME non-empty}"
+: "${TARGET:?Need to set TARGET non-empty}"
+
+if [[ -d "$HOME/${TOOLCHAIN_NAME}/${TARGET}" ]] ; then
+  echo "toolchain ${TOOLCHAIN_NAME} ${TARGET} exists!"
+  exit 0
+fi
+
+export ARCHIVE_NAME=${TOOLCHAIN_NAME}.tar.xz
+
+echo "TOOLCHAIN: $TOOLCHAIN_NAME"
+echo "TARGET   : $TARGET"
+
+cd $HOME
+
+test -f "${ARCHIVE_NAME}" || wget https://releases.linaro.org/components/toolchain/binaries/latest/${TARGET}/${ARCHIVE_NAME}
+tar -xJf ${ARCHIVE_NAME}