Raspberry Pi cross-compile in chroot

.travis.yml

@@ -19,7 +19,7 @@ install:
 
 before_script:
  - if test "${COMMIT_MESSAGE#*'[publish]'}" != "$COMMIT_MESSAGE"; then echo "publishing" && export PUBLISH=true; else echo "not publishing"; fi;
-
+ - if test "${MASON_PLATFORM}" == "ArmLinux"; then source osx/ArmLinux_setup.sh; fi;
+
 script:
- - source ./build.sh
- - ${TARGET}
+ - $COMPILE_ENV ./wrapper.sh

build.sh

@@ -58,7 +58,7 @@ function upgrade_gcc {
     fi
     echo "updating apt"
     sudo apt-get update -y
-    if [[ $(lsb_release --id) =~ "Ubuntu" ]]; then
+    if [[ $(lsb_release --id) =~ "Ubuntu" ]] || [[ $(lsb_release --id) =~ "Raspbian" ]]; then
         echo "installing C++11 compiler"
         sudo apt-get install -qq -y gcc-4.8 g++-4.8
         export CC="gcc-4.8"
@@ -91,6 +91,8 @@ function upgrade_clang {
            sudo apt-get install -y software-properties-common
            sudo add-apt-repository "deb http://llvm.org/apt/unstable/ llvm-toolchain-${CLANG_VERSION} main"
         fi
+    fi
+    if [[ $(lsb_release --id) =~ "Debian" ]] || [[ $(lsb_release --id) =~ "Raspbian" ]]; then
         echo "updating apt"
         sudo apt-get update -y
         echo 'upgrading libstdc++'

osx/ArmLinux.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+set -u
+
+export MASON_PLATFORM="ArmLinux"
+export HOST_PLATFORM="Linux"
+export BOOST_ARCH="arm"
+export ARCH_NAME="armv7"
+export HOST_ARG=""
+export CXX="g++"
+export CC="gcc"
+export MAKE="make"
+# default to C++11 for this platform
+if [[ "${CXX11:-false}" == false ]]; then
+  export CXX11=true
+fi
+source $(dirname "$BASH_SOURCE")/settings.sh

osx/ArmLinux_fake_sudo.sh

@@ -0,0 +1,3 @@
+#!/bin/bash
+
+$@

osx/ArmLinux_setup.sh

@@ -0,0 +1,23 @@
+CHROOT_BASE=. # This makes Travis CI environment easier
+
+MASON_PLATFORM=${MASON_PLATFORM-ArmLinux}
+CXX11=${CXX11-true}
+TARGET=${TARGET-build_mapnik}
+QUIET=${QUIET-true}
+MAPNIK_BRANCH=${MAPNIK_BRANCH-master}
+
+# select g++/gcc here because upgrade_(compiler) is called before platorm script
+CXX=g++
+CC=gcc
+
+export COMPILE_ENV="sudo chroot $CHROOT_BASE /usr/bin/env MASON_PLATFORM=${MASON_PLATFORM} CXX11=${CXX11} TARGET=${TARGET} QUIET=${QUIET} MAPNIK_BRANCH=${MAPNIK_BRANCH} CXX=${CXX} CC=${CC}"
+
+# setup chroot/qemu
+sudo apt-get install debootstrap qemu-user-static
+sudo debootstrap --foreign --variant=minbase --arch armhf --include=locales testing `pwd`/$CHROOT_BASE http://mirrordirector.raspbian.org/raspbian
+sudo cp /usr/bin/qemu-arm-static $CHROOT_BASE/usr/bin/
+sudo cp osx/ArmLinux_setup_stage2.sh $CHROOT_BASE/tmp/setup.sh
+sudo cp osx/ArmLinux_fake_sudo.sh $CHROOT_BASE/usr/bin/sudo
+
+# enter chroot/qemu
+$COMPILE_ENV /tmp/setup.sh

osx/ArmLinux_setup_stage2.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+
+LANG=${LANG-'en_US.UTF-8'}
+
+# finish debootstrap process
+./debootstrap/debootstrap --second-stage
+export DEBIAN_FRONTEND=noninteractive DEBCONF_NONINTERACTIVE_SEEN=true
+cat <<'EOF' > /tmp/preseed.txt
+locales locales/locales_to_be_generated multiselect en_US.UTF-8 UTF-8
+locales locales/default_environment_locale select en_US.UTF-8
+tzdata tzdata/Areas select US
+tzdata tzdata/Zones/US select Central
+EOF
+debconf-set-selections /tmp/preseed.txt
+export LANGUAGE=$LANG
+export LANG=$LANG
+export LC_ALL=$LANG
+locale-gen $LANG
+dpkg-reconfigure tzdata locales
+
+# set up apt-get
+echo "deb http://mirrordirector.raspbian.org/raspbian/ jessie main contrib non-free rpi" > /etc/apt/sources.list
+
+apt-get update
+apt-get install -q -y lsb-release wget
+
+# mount proc for 'free'
+mount proc /proc -t proc

osx/settings.sh

@@ -209,6 +209,24 @@ elif [[ ${MASON_PLATFORM} == 'Linaro-softfp' ]]; then
     fi
     export ZLIB_PATH="${SYSROOT}/usr"
 
+elif [[ ${MASON_PLATFORM} == 'ArmLinux' ]]; then
+    export EXTRA_CFLAGS=""
+    export EXTRA_LDFLAGS=""
+    export EXTRA_CXXFLAGS=""
+    export EXTRA_CPPFLAGS=""
+    export CORE_CXX="g++"
+    export CORE_CC="gcc"
+    export ARCH_FLAGS=""
+    export STDLIB="libstdcpp"
+    export STDLIB_CXXFLAGS=""
+    export STDLIB_LDFLAGS=""
+    export CXX_VISIBILITY_FLAGS=""
+    if [[ "${CXX11}" == true ]]; then
+      export STDLIB="libstdcpp"
+      export STDLIB_CXXFLAGS="-std=c++11 -DBOOST_SPIRIT_USE_PHOENIX_V3=1"
+      export STDLIB_LDFLAGS=""
+    fi
+    export SDK_PATH=""
 elif [[ ${MASON_PLATFORM} == 'Android' ]]; then
     export CXX_VISIBILITY_FLAGS=""
     export alias ldconfig=true

wrapper.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+echo "Initial environment:"
+env
+
+echo "Sourcing build.sh for build functions ..."
+source ./build.sh
+
+echo "Post-build.sh environment:"
+env
+
+echo "Running '${TARGET}' as build target ..."
+${TARGET}