FIX: building Linux-ARM64 wheels

.github/workflows/tests.yml

@@ -126,6 +126,11 @@ jobs:
         # explicitly here.
         os:
         - ubuntu-latest
+        # Overhead of building ARM wheels on Intel Linux nodes is
+        # unreasonably high (20s build time per wheel vs 3m);
+        # it's better to just spin another runner up to build them
+        # natively
+        - ubuntu-24.04-arm
         - macOS-latest
         - windows-latest
         # Since the oldest Python available on windows-11-arm on GitHub
@@ -142,6 +147,8 @@ jobs:
     - name: Enable MSVC 64bit
       uses: ilammy/msvc-dev-cmd@v1
       if: ${{ startsWith(matrix.os, 'windows-') }} && ${{ contains(matrix.cibw_skip, '*-win32') }}
+    # Note: Since we're building Linux wheels on their native
+    # architectures, we don't need QEMU
     - name: Set up QEMU
       uses: docker/[email protected]
       if: runner.os == 'Linux' && matrix.arch != 'auto'
@@ -155,10 +162,10 @@ jobs:
       env:
         CIBW_SKIP: ${{ matrix.cibw_skip }}
         # We're building on Windows-x64, so ARM64 wheels can't be tested
-        # locally by `cibuildwheel` (don't worry, we're testing them
-        # later though in `test_binpy_wheels`)
+        # locally by `cibuildwheel`
+        # (don't worry, we're testing them later though in
+        # `test_binpy_wheels`)
         CIBW_TEST_SKIP: '*-win_arm64'
-        CIBW_ARCHS_LINUX: ${{ matrix.arch }}
         CIBW_ENVIRONMENT: PYTHONUTF8=1
         PYTHONUTF8: '1'
         # `msvc-dev-cmd` sets this envvar, which interferes with
@@ -228,6 +235,10 @@ jobs:
           install-extras: tests-strict,runtime-strict
           os: ubuntu-latest
           arch: auto
+        - python-version: '3.8'
+          install-extras: tests-strict,runtime-strict
+          os: ubuntu-24.04-arm
+          arch: auto
         - python-version: '3.8'
           install-extras: tests-strict,runtime-strict
           os: macOS-latest
@@ -241,6 +252,10 @@ jobs:
           install-extras: tests-strict,runtime-strict,optional-strict
           os: ubuntu-latest
           arch: auto
+        - python-version: '3.13'
+          install-extras: tests-strict,runtime-strict,optional-strict
+          os: ubuntu-24.04-arm
+          arch: auto
         - python-version: '3.13'
           install-extras: tests-strict,runtime-strict,optional-strict
           os: macOS-latest
@@ -253,6 +268,14 @@ jobs:
           install-extras: tests-strict,runtime-strict,optional-strict
           os: windows-11-arm
           arch: auto
+        - python-version: '3.13'
+          install-extras: tests
+          os: ubuntu-latest
+          arch: auto
+        - python-version: '3.13'
+          install-extras: tests
+          os: ubuntu-24.04-arm
+          arch: auto
         - python-version: '3.13'
           install-extras: tests
           os: macOS-latest
@@ -289,10 +312,38 @@ jobs:
           install-extras: tests,optional
           os: ubuntu-latest
           arch: auto
-        - python-version: 3.14.0-rc.1
+        - python-version: '3.14'
           install-extras: tests,optional
           os: ubuntu-latest
           arch: auto
+        - python-version: '3.8'
+          install-extras: tests,optional
+          os: ubuntu-24.04-arm
+          arch: auto
+        - python-version: '3.9'
+          install-extras: tests,optional
+          os: ubuntu-24.04-arm
+          arch: auto
+        - python-version: '3.10'
+          install-extras: tests,optional
+          os: ubuntu-24.04-arm
+          arch: auto
+        - python-version: '3.11'
+          install-extras: tests,optional
+          os: ubuntu-24.04-arm
+          arch: auto
+        - python-version: '3.12'
+          install-extras: tests,optional
+          os: ubuntu-24.04-arm
+          arch: auto
+        - python-version: '3.13'
+          install-extras: tests,optional
+          os: ubuntu-24.04-arm
+          arch: auto
+        - python-version: '3.14'
+          install-extras: tests,optional
+          os: ubuntu-24.04-arm
+          arch: auto
         - python-version: '3.8'
           install-extras: tests,optional
           os: macOS-latest
@@ -317,7 +368,7 @@ jobs:
           install-extras: tests,optional
           os: macOS-latest
           arch: auto
-        - python-version: 3.14.0-rc.1
+        - python-version: '3.14'
           install-extras: tests,optional
           os: macOS-latest
           arch: auto
@@ -345,7 +396,7 @@ jobs:
           install-extras: tests,optional
           os: windows-latest
           arch: auto
-        - python-version: 3.14.0-rc.1
+        - python-version: '3.14'
           install-extras: tests,optional
           os: windows-latest
           arch: auto
@@ -364,7 +415,7 @@ jobs:
           install-extras: tests,optional
           os: windows-11-arm
           arch: auto
-        - python-version: 3.14.0-rc.1
+        - python-version: '3.14'
           install-extras: tests,optional
           os: windows-11-arm
           arch: auto
@@ -378,6 +429,8 @@ jobs:
       # # assumes `arch=x64`, so we have to manually set it here...
       with:
         arch: ${{ contains(matrix.os, 'arm') && 'arm64' || 'x64' }}
+    # Note: Since we're testing Linux wheels on their native
+    # architectures, we don't need QEMU
     - name: Set up QEMU
       uses: docker/[email protected]
       if: runner.os == 'Linux' && matrix.arch != 'auto'

CHANGELOG.rst

@@ -11,6 +11,7 @@ Changes
 * FIX: mitigate speed regressions introduced in 5.0.0 #376
 * FIX: Use import system to locate module file run by ``kernprof -m`` #389
 * FIX: Fixed build on Windows-ARM64 and now building wheels therefor in CI #391
+* FIX: Restored building and testing of Linux-ARM64 wheels #402
 
 5.0.0
 ~~~~~

pyproject.toml

@@ -31,13 +31,23 @@ omit =[
 
 [tool.cibuildwheel]
 build = "cp38-* cp39-* cp310-* cp311-* cp312-* cp313-* cp314-*"
-skip = ["*-win32", "cp313-musllinux_i686"]
+skip = [
+    # XXX: since `tests.yml` already defines `matrix.cibw_skip` for
+    # `build_binpy_wheels`, can we deduplicate and just use that?
+    # Or do we need these when building wheels for release, which may
+    # run on separate pipelines?
+    '*-win32',
+    'cp313-musllinux_i686',
+]
 build-frontend = "build"
 build-verbosity = 1
 test-command = "python {project}/run_tests.py"
 test-extras = ["tests-strict", "runtime-strict"]
 
 # https://cibuildwheel.readthedocs.io/en/stable/options/#archs
+[tool.cibuildwheel.linux]
+# We'll build X86 and ARM wheels natively on separate runners
+archs = ['auto']
 [tool.cibuildwheel.macos]
 archs = ["x86_64", "universal2", "arm64"]
 [tool.cibuildwheel.windows]