Travis build with MinGW

.travis.yml

@@ -5,6 +5,11 @@ env:
 
 jobs:
   include:
+  - os:   linux
+    env:
+    - CROSS_COMPILE=mingw32
+    - CONTAINER=cross
+
   - os:   linux
     arch: amd64
     dist: bionic

.travis/after_success.sh

@@ -1,9 +1,10 @@
 #!/bin/bash
 
 set -ex
+. .travis/environment.sh
 
 cd build
-make install
+buildenv make install
 tar -zcvf "${INSTALL_DIR}.tar.gz" ${INSTALL_DIR}
 mv "${INSTALL_DIR}.tar.gz" ${TRAVIS_BUILD_DIR}
 cd ..

.travis/before_install.sh

@@ -1,18 +1,31 @@
 #!/bin/bash
 
 set -ex
+. .travis/environment.sh
 
 cmake_dir="cmake-3.13.0-${TRAVIS_OS_NAME}-${TRAVIS_CPU_ARCH}"
 cmake_arc="${cmake_dir}.tar.gz"
 cmake_url="https://github.com/sfztools/cmake/releases/download/${TRAVIS_OS_NAME}/${cmake_arc}"
 
-if [[ ${TRAVIS_OS_NAME} == "linux" ]]; then
+if [[ ${CROSS_COMPILE} == "mingw32" ]]; then
+  buildenv bash -c "echo Hello from container" # ensure to start the container
+  docker cp "$container":/etc/pacman.conf pacman.conf
+  cat >>pacman.conf <<EOF
+[multilib]
+Include = /etc/pacman.d/mirrorlist
+
+[mingw-w64]
+SigLevel = Optional TrustAll
+Server = https://github.com/jpcima/arch-mingw-w64/releases/download/repo.\$arch/
+EOF
+  docker cp pacman.conf "$container":/etc/pacman.conf
+  rm -f pacman.conf
+elif [[ ${TRAVIS_OS_NAME} == "linux" ]]; then
   wget -q ${cmake_url}
   tar xzf ${cmake_arc}
   cd ${TRAVIS_BUILD_DIR}/${cmake_dir}
   sudo cp    bin/*   /usr/local/bin/
   sudo cp -r share/* /usr/local/share/
-  export PATH="/usr/local/bin:$PATH" # FIXME
 elif [[ ${TRAVIS_OS_NAME} == "osx" ]]; then
   sudo ln -s /usr/local /opt/local
   brew update

.travis/discord_webhook.sh

@@ -1,6 +1,7 @@
 #!/bin/bash
 
 set -ex
+. .travis/environment.sh
 
 # Travis Webhook
 wget https://raw.githubusercontent.com/DiscordHooks/travis-ci-discord-webhook/master/send.sh

.travis/environment.sh

@@ -0,0 +1,31 @@
+# ---------------------------------------------------------------------------- #
+# Global environment included from all scripts                                 #
+# ---------------------------------------------------------------------------- #
+
+# add /usr/local/bin to path, for custom cmake installs
+if [[ ${TRAVIS_OS_NAME} == "linux" || ${TRAVIS_OS_NAME} == "osx" ]]; then
+  export PATH="/usr/local/bin:$PATH"
+fi
+
+# buildenv runs a command in host machine or container, depending on build
+if [[ ${CROSS_COMPILE} == "mingw32" ]]; then
+  buildenv() {
+    setup_container archlinux
+    docker exec -w "$(pwd)" -i -t "$container" "$@"
+  }
+else
+  buildenv() {
+    "$@"
+  }
+fi
+
+# create a container based on given image if not existing
+# the container id is persisted in a file across different scripts
+setup_container() {
+    if [ -f ${TRAVIS_BUILD_DIR}/docker-container-id ]; then
+      container=$(cat ${TRAVIS_BUILD_DIR}/docker-container-id)
+    else
+      container=$(docker run -d -i -t -v /home:/home "$1" /bin/bash)
+      echo "$container" > ${TRAVIS_BUILD_DIR}/docker-container-id
+    fi
+}

.travis/install.sh

@@ -1,8 +1,13 @@
 #!/bin/bash
 
 set -ex
+. .travis/environment.sh
 
-if [[ ${TRAVIS_OS_NAME} == "linux" ]]; then
+if [[ ${CROSS_COMPILE} == "mingw32" ]]; then
+  buildenv pacman -Sqy --noconfirm
+  buildenv pacman -Sq --noconfirm base-devel wget mingw-w64-cmake mingw-w64-gcc mingw-w64-pkg-config mingw-w64-libsndfile
+  buildenv i686-w64-mingw32-gcc -v && buildenv i686-w64-mingw32-g++ -v && buildenv i686-w64-mingw32-cmake --version
+elif [[ ${TRAVIS_OS_NAME} == "linux" ]]; then
   sudo apt-get install libasound2-dev libjack-jackd2-dev libsndfile1-dev lv2-dev
   gcc -v && g++ -v && cmake --version && /usr/local/bin/cmake --version && $SHELL --version
 fi

.travis/script.sh

@@ -1,16 +1,22 @@
 #!/bin/bash
 
 set -ex
+. .travis/environment.sh
 
 mkdir -p build/${INSTALL_DIR} && cd build
-/usr/local/bin/cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX:PATH=${PWD}/${INSTALL_DIR} ..
 
-if [[ ${TRAVIS_OS_NAME} == "linux" ]]; then
+if [[ ${CROSS_COMPILE} == "mingw32" ]]; then
 
-  make -j$(nproc)
+  buildenv i686-w64-mingw32-cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX:PATH=${PWD}/${INSTALL_DIR} -DSFIZZ_JACK=OFF ..
+  buildenv make -j
+elif [[ ${TRAVIS_OS_NAME} == "linux" ]]; then
+
+  buildenv cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX:PATH=${PWD}/${INSTALL_DIR} ..
+  buildenv make -j$(nproc)
 elif [[ ${TRAVIS_OS_NAME} == "osx" ]]; then
 
-  make -j$(sysctl -n hw.ncpu)
+  buildenv cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX:PATH=${PWD}/${INSTALL_DIR} ..
+  buildenv make -j$(sysctl -n hw.ncpu)
 
 # Xcode not currently supported, see https://gitlab.kitware.com/cmake/cmake/issues/18088
 # xcodebuild -project sfizz.xcodeproj -alltargets -configuration Debug build

.travis/update_dox.sh

@@ -1,9 +1,10 @@
 #!/bin/bash
 
 set -x # No fail, we need to go back to the original branch at the end
+. .travis/environment.sh
 
 # Build documentation only from Linux x86_64 builds
-if [[ ${TRAVIS_CPU_ARCH} != "amd64" || ${TRAVIS_OS_NAME} != "linux" ]]; then
+if [[ ${TRAVIS_CPU_ARCH} != "amd64" || ${TRAVIS_OS_NAME} != "linux" || "${CROSS_COMPILE}" != "" ]]; then
   exit 0
 fi