Merge pull request #21733 from hoodmane/fix-pointer-size-for-cross-build

ENH: Fix pointer size determination for cross build

1 files changed, 9 insertions, 1 deletions

diff --git a/numpy/linalg/setup.py b/numpy/linalg/setup.py
index dc62dff8f..1c4e1295e 100644
--- a/numpy/linalg/setup.py
+++ b/numpy/linalg/setup.py
@@ -1,5 +1,6 @@
 import os
 import sys
+import sysconfig
 
 def configuration(parent_package='', top_path=None):
     from numpy.distutils.misc_util import Configuration
@@ -38,7 +39,14 @@ def configuration(parent_package='', top_path=None):
         class numpy_linalg_lapack_lite(system_info):
             def calc_info(self):
                 info = {'language': 'c'}
-                if sys.maxsize > 2**32:
+                size_t_size = sysconfig.get_config_var("SIZEOF_SIZE_T")
+                if size_t_size:
+                    maxsize = 2**(size_t_size - 1) - 1
+                else:
+                    # We prefer using sysconfig as it allows cross-compilation
+                    # but the information may be missing (e.g. on windows).
+                    maxsize = sys.maxsize
+                if maxsize > 2**32:
                     # Build lapack-lite in 64-bit integer mode.
                     # The suffix is arbitrary (lapack_lite symbols follow it),
                     # but use the "64_" convention here.