1 files changed, 46 insertions, 0 deletions
diff --git a/Cython/Utility/NumpyImportArray.c b/Cython/Utility/NumpyImportArray.c
new file mode 100644
index 000000000..4f72d0b46
--- /dev/null
+++ b/Cython/Utility/NumpyImportArray.c
@@ -0,0 +1,46 @@
+///////////////////////// NumpyImportArray.init ////////////////////
+
+// comment below is deliberately kept in the generated C file to
+// help users debug where this came from:
+/*
+ * Cython has automatically inserted a call to _import_array since
+ * you didn't include one when you cimported numpy. To disable this
+ * add the line
+ *   <void>numpy._import_array
+ */
+#ifdef NPY_FEATURE_VERSION /* This is a public define that makes us reasonably confident it's "real" Numpy */
+// NO_IMPORT_ARRAY is Numpy's mechanism for indicating that import_array is handled elsewhere
+#if !NO_IMPORT_ARRAY /* https://docs.scipy.org/doc/numpy-1.17.0/reference/c-api.array.html#c.NO_IMPORT_ARRAY  */
+if (unlikely(_import_array() == -1)) {
+    PyErr_SetString(PyExc_ImportError, "numpy.core.multiarray failed to import "
+    "(auto-generated because you didn't call 'numpy.import_array()' after cimporting numpy; "
+    "use '<void>numpy._import_array' to disable if you are certain you don't need it).");
+}
+#endif
+#endif
+
+///////////////////////// NumpyImportUFunc.init ////////////////////
+
+// Unlike import_array, this is generated by the @cython.ufunc decorator
+// so we're confident the right headers are present and don't need to override them
+
+{
+    // NO_IMPORT_UFUNC is Numpy's mechanism for indicating that import_umath is handled elsewhere
+#if !NO_IMPORT_UFUNC /* https://numpy.org/devdocs/reference/c-api/ufunc.html#c.NO_IMPORT_UFUNC */
+    if (unlikely(_import_umath() == -1)) {
+        PyErr_SetString(PyExc_ImportError, "numpy.core.umath failed to import "
+        "(auto-generated by @cython.ufunc).");
+    }
+#else
+    if ((0)) {}
+#endif
+    // NO_IMPORT_ARRAY is Numpy's mechanism for indicating that import_array is handled elsewhere
+#if !NO_IMPORT_ARRAY /* https://docs.scipy.org/doc/numpy-1.17.0/reference/c-api.array.html#c.NO_IMPORT_ARRAY  */
+    else if (unlikely(_import_array() == -1)) {
+        PyErr_SetString(PyExc_ImportError, "numpy.core.multiarray failed to import "
+        "(auto-generated by @cython.ufunc).");
+    }
+#endif
+}
+
+