From 6d444245087fa0166749d8dbc780b5e82b98e6f4 Mon Sep 17 00:00:00 2001
From: Ralf Gommers <ralf.gommers@gmail.com>
Date: Thu, 15 Dec 2022 13:19:42 +0100
Subject: [PATCH] REV: revert change to `numpyconfig.h` for sizeof(type)
 hardcoding on macOS

Reverts gh-22614, and adds more detail about why that code is needed and
when it can be removed.

Closes gh-22796

[skip cirrus]
[skip circle]
---
 numpy/core/include/numpy/numpyconfig.h | 52 ++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/numpy/core/include/numpy/numpyconfig.h b/numpy/core/include/numpy/numpyconfig.h
index 0d6585bb999f..4b5209837317 100644
--- a/numpy/core/include/numpy/numpyconfig.h
+++ b/numpy/core/include/numpy/numpyconfig.h
@@ -3,6 +3,58 @@
 
 #include "_numpyconfig.h"
 
+/*
+ * On Mac OS X, because there is only one configuration stage for all the archs
+ * in universal builds, any macro which depends on the arch needs to be
+ * hardcoded.
+ *
+ * Note that distutils/pip will attempt a universal2 build when Python itself
+ * is built as universal2, hence this hardcoding is needed even if we do not
+ * support universal2 wheels anymore (see gh-22796).
+ * This code block can be removed after we have dropped the setup.py based
+ * build completely.
+ */
+#ifdef __APPLE__
+    #undef NPY_SIZEOF_LONG
+    #undef NPY_SIZEOF_PY_INTPTR_T
+
+    #ifdef __LP64__
+        #define NPY_SIZEOF_LONG         8
+        #define NPY_SIZEOF_PY_INTPTR_T  8
+    #else
+        #define NPY_SIZEOF_LONG         4
+        #define NPY_SIZEOF_PY_INTPTR_T  4
+    #endif
+
+    #undef NPY_SIZEOF_LONGDOUBLE
+    #undef NPY_SIZEOF_COMPLEX_LONGDOUBLE
+    #ifdef HAVE_LDOUBLE_IEEE_DOUBLE_LE
+      #undef HAVE_LDOUBLE_IEEE_DOUBLE_LE
+    #endif
+    #ifdef HAVE_LDOUBLE_INTEL_EXTENDED_16_BYTES_LE
+      #undef HAVE_LDOUBLE_INTEL_EXTENDED_16_BYTES_LE
+    #endif
+
+    #if defined(__arm64__)
+        #define NPY_SIZEOF_LONGDOUBLE         8
+        #define NPY_SIZEOF_COMPLEX_LONGDOUBLE 16
+        #define HAVE_LDOUBLE_IEEE_DOUBLE_LE 1
+    #elif defined(__x86_64)
+        #define NPY_SIZEOF_LONGDOUBLE         16
+        #define NPY_SIZEOF_COMPLEX_LONGDOUBLE 32
+        #define HAVE_LDOUBLE_INTEL_EXTENDED_16_BYTES_LE 1
+    #elif defined (__i386)
+        #define NPY_SIZEOF_LONGDOUBLE         12
+        #define NPY_SIZEOF_COMPLEX_LONGDOUBLE 24
+    #elif defined(__ppc__) || defined (__ppc64__)
+        #define NPY_SIZEOF_LONGDOUBLE         16
+        #define NPY_SIZEOF_COMPLEX_LONGDOUBLE 32
+    #else
+        #error "unknown architecture"
+    #endif
+#endif
+
+
 /**
  * To help with the NPY_NO_DEPRECATED_API macro, we include API version
  * numbers for specific versions of NumPy. To exclude all API that was