diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
new file mode 100644
index 0000000000..6a429cfa39
--- /dev/null
+++ b/.github/workflows/build.yml
@@ -0,0 +1,64 @@
+name: Build
+
+on:
+  push:
+    branches:
+      - 'master'
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  linux:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        target: [aarch64, arm, ppc, riscv, x86_32, x86_64]
+    env:
+      target: ${{ matrix.target }}
+      os: linux
+      jobs: 4
+      opamroot: /home/coq/.opam
+    container:
+      image: coqorg/coq:8.17.1
+      options: --user root
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          submodules: true
+      - name: OS dependencies
+        run: tools/runner.sh system_install
+      - name: OPAM dependencies
+        run: tools/runner.sh opam_install menhir
+      - name: Configure
+        run: tools/runner.sh configure
+      - name: Build
+        run: tools/runner.sh build
+      - name: Test default configuration
+        run: tools/runner.sh test1
+      - name: Test alternate configuration
+        run: tools/runner.sh test2
+      - name: Test alternate configuration 2
+        run: tools/runner.sh test3
+  macos:
+    runs-on: macos-latest
+    env:
+      target: aarch64
+      os: macos
+      jobs: 3
+      configopts: -ignore-coq-version -ignore-ocaml-version
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          submodules: true
+      - name: OS dependencies
+        run: brew install coq menhir ocaml
+      - name: Configure
+        run: tools/runner.sh configure
+      - name: Build
+        run: tools/runner.sh build
+      - name: Test default configuration
+        run: tools/runner.sh test1
+      - name: Test alternate configuration
+        run: tools/runner.sh test2
diff --git a/.github/workflows/latest.yml b/.github/workflows/latest.yml
new file mode 100644
index 0000000000..507ed0c413
--- /dev/null
+++ b/.github/workflows/latest.yml
@@ -0,0 +1,36 @@
+name: Latest
+
+on:
+  push:
+    branches:
+      - 'master'
+  workflow_dispatch:
+
+jobs:
+  latest:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        target: [aarch64, arm, ppc, riscv, x86_32, x86_64]
+    env:
+      target: ${{ matrix.target }}
+      os: linux
+      jobs: 4
+      opamroot: /home/coq/.opam
+      configopts: -ignore-coq-version
+    container:
+      image: coqorg/coq:latest-ocaml-4.14-flambda
+      options: --user root
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          submodules: true
+      - name: OPAM dependencies
+        run: tools/runner.sh opam_install menhir
+      - name: Configure
+        run: tools/runner.sh configure
+      - name: Build
+        run: tools/runner.sh build_ccomp
+      - name: Check proof
+        run: tools/runner.sh check_proof
diff --git a/.github/workflows/oldest.yml b/.github/workflows/oldest.yml
new file mode 100644
index 0000000000..95b59e0a16
--- /dev/null
+++ b/.github/workflows/oldest.yml
@@ -0,0 +1,34 @@
+name: Oldest
+
+on:
+  push:
+    branches:
+      - 'master'
+  workflow_dispatch:
+
+jobs:
+  latest:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        target: [aarch64, arm, ppc, riscv, x86_32, x86_64]
+    env:
+      target: ${{ matrix.target }}
+      os: linux
+      jobs: 4
+      opamroot: /home/coq/.opam
+      configopts: -ignore-coq-version
+    container:
+      image: coqorg/coq:8.12
+      options: --user root
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          submodules: true
+      - name: OPAM dependencies
+        run: tools/runner.sh opam_install menhir
+      - name: Configure
+        run: tools/runner.sh configure
+      - name: Build
+        run: tools/runner.sh build_ccomp
diff --git a/tools/runner.sh b/tools/runner.sh
new file mode 100755
index 0000000000..aa72e13460
--- /dev/null
+++ b/tools/runner.sh
@@ -0,0 +1,225 @@
+# Tell the tools to use only ASCII in diagnostic outputs
+export LC_ALL=C
+
+# Stop on error
+set -e
+
+# Simulators
+
+simu_aarch64="qemu-aarch64 -L /usr/aarch64-linux-gnu"
+simu_armsf="qemu-arm -L /usr/arm-linux-gnueabi"
+simu_armhf="qemu-arm -L /usr/arm-linux-gnueabihf"
+simu_ppc32="qemu-ppc -L /usr/powerpc-linux-gnu -cpu G4"
+simu_rv64="qemu-riscv64 -L /usr/riscv64-linux-gnu"
+# simu_x86_32="qemu-i386 -L /usr/i686-linux-gnu"
+
+# Fatal error
+
+Fatal() {
+  echo "FATAL ERROR: $@" 1>&2
+  exit 2
+}
+
+# Validate input parameters
+
+if test -z "$target"; then Fatal 'Missing $target value'; fi
+if test -z "$os"; then Fatal 'Missing $os value'; fi
+if test -z "$jobs"; then jobs=1; fi
+
+# Set up OPAM (if requested)
+
+if test -n "$opamroot"; then
+  export OPAMROOT="$opamroot"
+  eval `opam env --safe`
+fi
+
+# Install additional system packages
+
+System_install() {
+  case "$target,$os" in
+    aarch64,linux)
+      sudo apt-get update
+      sudo apt-get -y install qemu-user gcc-aarch64-linux-gnu
+      ;;
+    arm,linux)
+      sudo apt-get update
+      sudo apt-get -y install qemu-user gcc-arm-linux-gnueabi gcc-arm-linux-gnueabihf
+      ;;
+    ppc,linux)
+      sudo apt-get update
+      sudo apt-get -y install qemu-user gcc-powerpc-linux-gnu
+      ;;
+    riscv,linux)
+      sudo apt-get update
+      sudo apt-get -y install qemu-user gcc-riscv64-linux-gnu
+      ;;
+    x86_32,linux)
+      sudo apt-get update
+      sudo apt-get -y install gcc-multilib
+      ;;
+    x86_64,linux)
+      ;;
+    aarch64,macos)
+      ;;
+    x86_64,macos)
+      ;;
+    x86_32,windows)
+      ;;
+    x86_64,windows)
+      ;;
+  esac
+}
+
+# Install additional OPAM packages
+
+OPAM_install() {
+  if test -n "$*"; then
+    opam install -y $*
+  fi
+}
+
+# Run configure script
+
+Configure() {
+  echo "Configuration parameters:"
+  echo "    Target architecture \"$target\" (variable \$target)"
+  echo "    Host OS \"$os\" (variable \$os)"
+  echo "    Configure options \"$configopts\" (variable \$configopts)"
+  echo ""
+  case "$target,$os" in
+    aarch64,linux)
+      ./configure $configopts -toolprefix aarch64-linux-gnu- aarch64-linux
+      ;;
+    arm,linux)
+      ./configure $configopts -toolprefix arm-linux-gnueabihf- arm-eabihf
+      ;;
+    ppc,linux)
+      ./configure $configopts -toolprefix powerpc-linux-gnu- ppc-linux
+      ;;
+    riscv,linux)
+      ./configure $configopts -toolprefix riscv64-linux-gnu- rv64-linux
+      ;;
+    x86_32,linux)
+      ./configure $configopts x86_32-linux
+      ;;
+    x86_64,linux)
+      ./configure $configopts -clightgen x86_64-linux
+      ;;
+    aarch64,macos)
+      ./configure $configopts -clightgen aarch64-macos
+      ;;
+    x86_64,macos)
+      ./configure $configopts x86_64-macos
+      ;;
+    x86_32,windows)
+      ./configure $configopts x86_32-cygwin
+      ;;
+    x86_64,windows)
+      ./configure $configopts x86_64-cygwin
+      ;;
+    *)
+      Fatal "Unknown configuration \"$target\" - \"$os\""
+      ;;
+  esac
+}
+
+# Full build (including standard library)
+
+Build_all() {
+  make -j$jobs all
+}
+
+# Coq + OCaml build (no standard library)
+
+Build_ccomp() {
+  make depend
+  make -j$jobs proof
+  make -j$jobs ccomp
+}
+
+# Recheck proof using coqchk
+
+Check_proof() {
+  output=`mktemp`
+  trap "rm -f $output" 0 INT
+  if make check-proof > $output 2>&1
+  then echo "Check proof: success"
+  else echo "Check proof: FAILURE"; cat $output; exit 2
+  fi
+}
+
+# Rebuild compcert.ini and the standard library with a different configuration
+# Don't rebuild ccomp
+
+Rebuild_runtime() {
+  ./configure $*
+  make compcert.ini
+  make -C runtime -s clean
+  make -C runtime -j$jobs all
+}
+
+# Run the test suite.
+# First parameter: name of simulator to use (if any)
+# Second parameter: compilation options (if any)
+
+Run_test() {
+  make -C test -s clean
+  make -C test CCOMPOPTS="$2" -j$jobs all
+  make -C test SIMU="$1" test
+}
+
+# Rounds of testing.
+# First parameter: round number (1, 2, ...)
+
+Run_test_round() {
+case "$target,$os" in
+  aarch64,linux)
+    case "$1" in
+      1) Run_test "$simu_aarch64" "";;
+      2) Run_test "$simu_aarch64" "-Os";;
+    esac;;
+  aarch64,macos)
+    case "$1" in
+      1) Run_test "" "";;
+      2) Run_test "" "-Os";;
+    esac;;
+  arm,linux)
+    case "$1" in
+      1) Run_test "$simu_armhf" "-marm";;
+      2) Run_test "$simu_armhf" "-mthumb";;
+      3) Rebuild_runtime -toolprefix arm-linux-gnueabi- arm-eabi
+         Run_test "$simu_armsf" "-marm";;
+    esac;;
+  ppc,linux)
+    case "$1" in
+      1) Run_test "$simu_ppc32" "";;
+      2) Run_test "$simu_ppc32" "-Os";;
+    esac;;
+  riscv,linux)
+    case "$1" in
+      1) Run_test "$simu_rv64" "";;
+      2) Run_test "$simu_rv64" "-Os";;
+    esac;;
+  x86_32,*|x86_64,*)
+    case "$1" in
+      1) Run_test "" "";;
+      2) Run_test "" "-Os";;
+    esac;;
+  *)
+    Fatal "Unknown configuration \"$target\" - \"$os\""
+esac
+}
+
+case "$1" in
+  system_install) System_install;;
+  opam_install) shift; OPAM_install "$@";;
+  configure) Configure;;
+  build) Build_all;;
+  test1) Run_test_round 1;;
+  test2) Run_test_round 2;;
+  test3) Run_test_round 3;;
+  build_ccomp) Build_ccomp;;
+  check_proof) Check_proof;;
+  *) Fatal "Unknown CI instruction: $1"; exit 1;;
+esac
+