Add complex compat header

numpy/core/include/meson.build

@@ -8,6 +8,7 @@ installed_headers = [
   'numpy/ndarrayobject.h',
   'numpy/ndarraytypes.h',
   'numpy/npy_1_7_deprecated_api.h',
+  'numpy/npy_2_complexcompat.h',
   'numpy/npy_3kcompat.h',
   'numpy/npy_common.h',
   'numpy/npy_cpu.h',

numpy/core/include/numpy/npy_2_complexcompat.h

@@ -0,0 +1,27 @@
+/* This header is designed to be copy-pasted into downstream packages, since it provides
+   a compatibility layer between the old C struct complex types and the new native C99
+   complex types. */
+#ifndef NUMPY_CORE_INCLUDE_NUMPY_NPY_2_COMPLEXCOMPAT_H_
+#define NUMPY_CORE_INCLUDE_NUMPY_NPY_2_COMPLEXCOMPAT_H_
+
+#include <numpy/numpyconfig.h>
+
+#if (defined(NPY_TARGET_VERSION) && NPY_TARGET_VERSION >= 0x00000012) || (NPY_FEATURE_VERSION >= 0x00000012)  /* Numpy 2.0 */
+#include <numpy/npy_math.h>
+
+#define NPY_CSETREALF(c, r) npy_csetrealf(c, r)
+#define NPY_CSETIMAGF(c, i) npy_csetimagf(c, i)
+#define NPY_CSETREAL(c, r)  npy_csetreal(c, r)
+#define NPY_CSETIMAG(c, i)  npy_csetimag(c, i)
+#define NPY_CSETREALL(c, r) npy_csetreall(c, r)
+#define NPY_CSETIMAGL(c, i) npy_csetimagl(c, i)
+#else
+#define NPY_CSETREALF(c, r) (c)->real = (r)
+#define NPY_CSETIMAGF(c, i) (c)->imag = (i)
+#define NPY_CSETREAL(c, r)  (c)->real = (r)
+#define NPY_CSETIMAG(c, i)  (c)->imag = (i)
+#define NPY_CSETREALL(c, r) (c)->real = (r)
+#define NPY_CSETIMAGL(c, i) (c)->imag = (i)
+#endif
+
+#endif