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
         cibw_skip:
@@ -140,6 +145,8 @@ jobs:
       if: ${{ startsWith(matrix.os, 'windows-') }} && ${{ contains(matrix.cibw_skip, '*-win32') }}
       with:
         arch: ${{ contains(matrix.os, 'arm') && 'arm64' || 'x64' }}
+    # 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'
@@ -153,7 +160,6 @@ jobs:
       env:
         CIBW_SKIP: ${{ matrix.cibw_skip }}
         CIBW_TEST_SKIP: '*-win_arm64'
-        CIBW_ARCHS_LINUX: ${{ matrix.arch }}
         CIBW_ENVIRONMENT: PYTHONUTF8=1
         PYTHONUTF8: '1'
         VSCMD_ARG_TGT_ARCH: ''
@@ -220,6 +226,10 @@ 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
@@ -232,6 +242,10 @@ 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
@@ -244,6 +258,14 @@ 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
@@ -284,6 +306,34 @@ jobs:
           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
@@ -364,6 +414,8 @@ jobs:
       if: ${{ startsWith(matrix.os, 'windows-') }}
       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

@@ -12,6 +12,7 @@ Changes
 * 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: Move away from older, (temporarily-)deprecated ``importlib.resources`` APIs in ``line_profiler.toml_config`` #406
+* FIX: Restored building and testing of Linux-ARM64 wheels #402
 
 5.0.0
 ~~~~~

pyproject.toml

@@ -38,6 +38,9 @@ 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]