travis: Run unit and functional tests on native arm

.travis.yml

@@ -94,9 +94,11 @@ jobs:
         - set -o errexit; source ./ci/extended_lint/06_script.sh
 
     - stage: test
-      name: 'ARM  [GOAL: install]  [unit tests, no functional tests]'
+      name: 'ARM  [GOAL: install]  [unit tests, functional tests]'
+      arch: arm64
       env: >-
         FILE_ENV="./ci/test/00_setup_env_arm.sh"
+        QEMU_USER_CMD=""  # Can run the tests natively without qemu
 
     - stage: test
       name: 'Win64  [GOAL: deploy]  [unit tests, no gui, no functional tests]'

ci/test/00_setup_env_arm.sh

@@ -7,11 +7,16 @@
 export LC_ALL=C.UTF-8
 
 export HOST=arm-linux-gnueabihf
-export QEMU_USER_CMD="qemu-arm -L /usr/arm-linux-gnueabihf/"
-export PACKAGES="python3 g++-arm-linux-gnueabihf busybox qemu-user"
+# The host arch is unknown, so we run the tests through qemu.
+# If the host is arm and wants to run the tests natively, it can set QEMU_USER_CMD to the empty string.
+export QEMU_USER_CMD="${QEMU_USER_CMD:"qemu-arm -L /usr/arm-linux-gnueabihf/"}"
+# We don't know whether the host can run the cross compiled binaries. To run them, either qemu-user or libc6:armhf for
+# the target is required, so install both.
+export DPKG_ADD_ARCH="armhf"
+export PACKAGES="python3 g++-arm-linux-gnueabihf busybox qemu-user libc6:armhf libstdc++6:armhf libfontconfig1:armhf libxcb1:armhf"
 export USE_BUSY_BOX=true
 export RUN_UNIT_TESTS=true
-export RUN_FUNCTIONAL_TESTS=false
+export RUN_FUNCTIONAL_TESTS=true
 export GOAL="install"
 # -Wno-psabi is to disable ABI warnings: "note: parameter passing for argument of type ... changed in GCC 7.1"
 # This could be removed once the ABI change warning does not show up by default

ci/test/04_install.sh

@@ -76,6 +76,9 @@ else
   DOCKER_EXEC echo "Number of CPUs \(nproc\):" \$\(nproc\)
 fi
 
+if [ -n "$DPKG_ADD_ARCH" ]; then
+  DOCKER_EXEC dpkg --add-architecture "$DPKG_ADD_ARCH"
+fi
 
 if [ "$TRAVIS_OS_NAME" != "osx" ]; then
   ${CI_RETRY_EXE} DOCKER_EXEC apt-get update