numpy 2.0.0rc migration

recipe/migrations/numpy2.yaml

@@ -0,0 +1,57 @@
+__migrator:
+  build_number: 1
+  kind: version
+  commit_message: |
+    Rebuild for numpy 2.0
+
+    As of version 2.0, the way we build against numpy has changed. In particular,
+    we no longer need to use the oldest available numpy version at build time
+    in order to support old numpy version at runtime - numpy will by default
+    use a compatible ABI for the oldest still-supported numpy versions.
+
+    Additionally, we no longer need to use `{{ pin_compatible("numpy") }}` as a
+    run requirement - this has been handled for more than two years now by a
+    run-export on the numpy package itself. The migrator will therefore remove
+    any occurrences of this.
+
+    However, by default, building against numpy 2.0 will assume that the package
+    is compatible with numpy 2.0, which is not necessarily the case. You should
+    check that the upstream package explicitly supports numpy 2.0, otherwise you
+    need to add a `- numpy <2` run requirement until that happens (check numpy
+    issue 26191 for an overview of the most important packages).
+
+    Finally, numpy 2.0 has not yet been released, but there is a release candidate
+    that promises to be ABI-compatible with the final release. This means we can
+    build against numpy 2.0.0rc1 (which can only be installed using a special channel
+    to opt in, i.e. `conda install -c conda-forge/label/numpy_rc numpy=2.0`), and yet
+    produce packages that are compatible with older numpy versions and therefore can
+    be published to our main channels.
+
+  migration_number: 1
+  ordering:
+  # prefer channels including numpy_rc (otherwise smithy doesn't
+  # know which of the two values should be taken on merge)
+  channel_sources:
+    - conda-forge
+    - conda-forge/label/numpy_rc,conda-forge
+
+# needs to fully reproduce zip of {python, python_impl, numpy}
+# in order to override it
+numpy:
+  - 1.22  # no py38 support for numpy 2.0
+  - 2.0
+  - 2.0
+  - 2.0
+python:
+  - 3.8.* *_cpython
+  - 3.9.* *_cpython
+  - 3.10.* *_cpython
+  - 3.11.* *_cpython
+python_impl:
+  - cpython
+  - cpython
+  - cpython
+  - cpython
+channel_sources:
+  - conda-forge/label/numpy_rc,conda-forge
+migrator_ts: 1713572489.295986

recipe/migrations/pypy38.yaml

@@ -36,6 +36,8 @@ python:
   - 3.9.* *_73_pypy    # [not (osx and arm64)]
 numpy:
   # part of a zip_keys: python, python_impl, numpy
-  - 1.22               # [not (osx and arm64)]
+  - 2.0                # [not (osx and arm64)]
 python_impl:
   - pypy               # [not (osx and arm64)]
+channel_sources:
+  - conda-forge/label/numpy_rc,conda-forge  # [not (osx and arm64)]

recipe/migrations/python312.yaml

@@ -33,6 +33,8 @@ python:
   - 3.12.* *_cpython
 # additional entries to add for zip_keys
 numpy:
-  - 1.26
+  - 2.0
 python_impl:
   - cpython
+channel_sources:
+  - conda-forge/label/numpy_rc,conda-forge