Add Cirrus CI

.cirrus.yml

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+env:
+  BUILD: check
+  HOST:
+  MAKEFLAGS: -j4
+  BENCH: yes
+  TESTRUNS:
+  EXEC_CMD:
+
+cat_logs_snippet: &CAT_LOGS
+  on_failure:
+    cat_config_log_script:
+      - cat config.log || true
+    cat_test_env_script:
+      - cat test_env.log || true
+    cat_ci_env_script:
+      - env
+
+merge_base_script_snippet: &MERGE_BASE
+  merge_base_script:
+    - if [ "$CIRRUS_PR" = "" ]; then exit 0; fi
+    - git fetch $CIRRUS_REPO_CLONE_URL $CIRRUS_BASE_BRANCH
+    - git config --global user.email "ci@ci.ci"
+    - git config --global user.name "ci"
+    - git merge FETCH_HEAD  # Merge base to detect silent merge conflicts
+
+task:
+  name: "x86_64: Linux (Debian stable)"
+  container:
+    dockerfile: ci/linux-debian.Dockerfile
+    memory: 2G
+    cpu: 4
+  matrix: &ENV_MATRIX
+    - env:
+    - env:
+        BUILD: distcheck
+    - env:
+        CFLAGS:  "-fsanitize=undefined -fno-omit-frame-pointer"
+        LDFLAGS: "-fsanitize=undefined -fno-omit-frame-pointer"
+        UBSAN_OPTIONS: "print_stacktrace=1:halt_on_error=1"
+        BENCH: no
+    - env:
+        EXEC_CMD: valgrind --error-exitcode=42
+        TESTRUNS: 1
+        BUILD:
+  matrix:
+    - env:
+        CC: gcc
+    - env:
+        CC: clang
+  << : *MERGE_BASE
+  test_script:
+    - ./ci/cirrus.sh
+  << : *CAT_LOGS
+
+task:
+  name: "i686: Linux (Debian stable)"
+  container:
+    dockerfile: ci/linux-debian.Dockerfile
+    memory: 2G
+    cpu: 4
+  env:
+    HOST: i686-linux-gnu
+  matrix:
+    - env:
+        CC: i686-linux-gnu-gcc
+    - env:
+        CC: clang --target=i686-pc-linux-gnu -isystem /usr/i686-linux-gnu/include
+  test_script:
+    - ./ci/cirrus.sh
+  << : *CAT_LOGS
+
+task:
+  name: "x86_64: macOS Catalina"
+  macos_instance:
+    image: catalina-base
+  env:
+    # Cirrus gives us a fixed number of 12 virtual CPUs.
+    MAKEFLAGS: -j13
+  matrix:
+    - env: {}
+    - env: {BUILD: distcheck}
+    - env:
+        CFLAGS:  "-fsanitize=undefined -fno-omit-frame-pointer"
+        LDFLAGS: "-fsanitize=undefined -fno-omit-frame-pointer"
+        UBSAN_OPTIONS: "print_stacktrace=1:halt_on_error=1"
+  matrix:
+    - env:
+        CC: gcc-9
+    - env:
+        CC: clang
+  brew_script:
+    - brew install automake libtool gcc@9
+  << : *MERGE_BASE
+  test_script:
+    - ./ci/cirrus.sh
+  << : *CAT_LOGS
+
+task:
+  name: "s390x (big-endian): Linux (Debian stable, QEMU)"
+  container:
+    dockerfile: ci/linux-debian.Dockerfile
+    cpu: 4
+    memory: 2G
+  env:
+    EXEC_CMD: qemu-s390x -L /usr/s390x-linux-gnu
+    HOST: s390x-linux-gnu
+    BUILD:
+  << : *MERGE_BASE
+  test_script:
+    # https://sourceware.org/bugzilla/show_bug.cgi?id=27008
+    - rm /etc/ld.so.cache
+    - ./ci/cirrus.sh
+  << : *CAT_LOGS
+
+task:
+  name: "x86_64-w64-mingw32: Linux (Debian stable, Wine)"
+  container:
+    dockerfile: ci/linux-debian.Dockerfile
+    cpu: 4
+    memory: 2G
+  env:
+    EXEC_CMD: wine
+    HOST: x86_64-w64-mingw32
+    CXXFLAGS: -O2 -static -static-libgcc -static-libstdc++
+    BUILD:
+  << : *MERGE_BASE
+  test_script:
+    - ./ci/cirrus.sh
+  << : *CAT_LOGS

ci/cirrus.sh

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+#!/bin/sh
+
+set -e
+set -x
+
+export LC_ALL=C
+
+env >> test_env.log
+
+$CC -v || true
+valgrind --version || true
+
+./autogen.sh
+
+./configure --host="$HOST" --enable-benchmark="$BENCH"
+
+# We have set "-j<n>" in MAKEFLAGS.
+make
+
+# Print information about binaries so that we can see that the architecture is correct
+file test* || true
+file bench* || true
+file .libs/* || true
+
+if [ -n "$BUILD" ]
+then
+    make "$BUILD"
+fi
+
+if [ -n "$EXEC_CMD" ]; then
+    $EXEC_CMD ./test $TESTRUNS
+    $EXEC_CMD ./test-verify $TESTRUNS
+fi
+
+if [ "$BENCH" = "yes" ]; then
+    $EXEC_CMD ./bench
+fi

ci/linux-debian.Dockerfile

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+FROM debian:stable
+
+RUN dpkg --add-architecture i386
+RUN dpkg --add-architecture s390x
+RUN apt-get update
+
+# dkpg-dev: to make pkg-config work in cross-builds
+RUN apt-get install --no-install-recommends --no-upgrade -y \
+        git ca-certificates \
+        make automake libtool pkg-config dpkg-dev valgrind qemu-user \
+        gcc g++ clang libc6-dbg \
+        gcc-i686-linux-gnu g++-i686-linux-gnu libc6-dev-i386-cross libc6-dbg:i386 \
+        g++-s390x-linux-gnu gcc-s390x-linux-gnu libc6-dev-s390x-cross libc6-dbg:s390x \
+        wine g++-mingw-w64-x86-64
+
+# Run a dummy command in wine to make it set up configuration
+RUN wine true || true