Wheels: ARM64 builders for Linux & Windows

.github/workflows/build.yml

@@ -38,11 +38,15 @@ jobs:
             env:
               ADIOS2: "OFF"
 
-          # builds faster on Travis-CI:
-          #- os: ubuntu-20.04
-          #  arch: "aarch64"
+          # Linux ARM64 (aarch64): native GitHub-hosted runner, free for public
+          # repos (cibuildwheel builds aarch64 natively, no QEMU). Full parity with
+          # the x86_64 leg above: cp310-cp314, many + musl, ADIOS2 ON.
+          # (Formerly built on Travis-CI, which is retired.)
+          - os: ubuntu-24.04-arm
+            arch: "aarch64"
 
-          # builds faster on Travis-CI:
+          # ppc64le was only ever built on the (now retired) Travis-CI; there is no
+          # free GitHub-hosted ppc64le runner, so these wheels are no longer produced.
           #- os: ubuntu-20.04
           #  arch: "ppc64le"
 
@@ -63,6 +67,17 @@ jobs:
               CMAKE_GENERATOR_PLATFORM: "Win32"
               ADIOS2: "OFF"   # 32-bit: no 32-bit ADIOS2 CI; BP read segfaults (see i686)
 
+          # Windows ARM64: native GitHub-hosted runner, free for public repos
+          # (cibuildwheel ARM64 support is still experimental). CPython win_arm64
+          # exists only from 3.11+, so no cp310 and no PyPy here. First cut ships
+          # HDF5 + JSON only (ADIOS2 OFF) to avoid an unproven ADIOS2-on-ARM64 build;
+          # library_builders.bat then compiles only zlib + HDF5. See i686/win32.
+          - os: windows-11-arm
+            arch: "ARM64"
+            build: "cp311-* cp312-* cp313-* cp314-*"
+            env:
+              ADIOS2: "OFF"
+
           - os: macos-15-intel
             arch: "x86_64"
             env:
@@ -235,8 +250,8 @@ jobs:
         CIBW_TEST_REQUIRES_PYODIDE: numpy
         CIBW_TEST_COMMAND: >
           python {project}/.github/check_wheel_libs.py &&
-          python -c "import sys, openpmd_api as io; v = io.variants;
-          need_adios2 = sys.maxsize > 2**32;
+          python -c "import openpmd_api as io; v = io.variants;
+          need_adios2 = '${{ matrix.env.ADIOS2 || 'ON' }}' == 'ON';
           assert v['hdf5'] and v['json'] and (v['adios2'] or not need_adios2), v;
           print('openPMD', io.__version__, dict(v))" &&
           python {project}/.github/smoke_roundtrip.py

.travis.yml

@@ -134,12 +134,12 @@ install:
   - git clone --branch ${OPENPMD_GIT_REF} --depth 1 https://github.com/openPMD/openPMD-api.git src
   - cp library_builders.sh list_library_deps.py check_wheel_libs.py smoke_roundtrip.py src/.github/
   # Wheels-only re-release: bump the package version (same source).
-  - (cd src && git apply ../setup-py-version-post2.patch)
+  - (cd src && git apply ../setup-py-version-post4.patch)
   # Keep statically-embedded deps (HDF5/ADIOS2/openPMD) private so the wheel can
   # be co-loaded with another extension that also embeds them (ImpactX/WarpX).
   - (cd src && git apply ../python-hide-symbols.patch)
   - python -m pip install --upgrade pip setuptools wheel
-  - python -m pip install cibuildwheel==3.2.1
+  - python -m pip install cibuildwheel==4.1.0
   # twine & cryptography: see
   #   https://github.com/scikit-build/cmake-python-distributions/blob/4730aeee240917303f293dffc89a8d8d5a4787c4/requirements-deploy.txt
   #   https://github.com/pyca/cryptography/issues/6086

library_builders.bat

@@ -288,10 +288,20 @@ exit /b 0
 :main
 call :install_buildessentials
 call :build_zlib
-call :build_sqlite
-:: build_bzip2
-:: build_szip
-call :build_zfp
-call :build_blosc2
 call :build_hdf5
-call :build_adios2
+
+rem ADIOS2 and its exclusive dependencies (SQLite3, ZFP, C-Blosc2) are only built
+rem when openPMD is configured with ADIOS2 (openPMD_CMAKE_openPMD_USE_ADIOS2=ON, set
+rem via CIBW_ENVIRONMENT_WINDOWS and visible here in the before-build step). Targets
+rem that ship HDF5 + JSON only -- Windows ARM64 and win32 (x86) -- skip this whole
+rem chain, which avoids an unproven ADIOS2-on-ARM64 build and trims the required
+rem tooling to curl + PowerShell + CMake. HDF5 depends only on zlib, so it stays
+rem unconditional above.
+if /I "%openPMD_CMAKE_openPMD_USE_ADIOS2%"=="ON" (
+  call :build_sqlite
+  rem build_bzip2
+  rem build_szip
+  call :build_zfp
+  call :build_blosc2
+  call :build_adios2
+)