From 16dd09e6c79768a24f5a50ec5985e0b6fdf17f35 Mon Sep 17 00:00:00 2001
From: Gyorgy Sarvari <skandigraun@gmail.com>
Date: Mon, 10 Mar 2025 13:52:11 +0100
Subject: [PATCH] BLD: add option to specify numpy header location

In some cases the numpy module might not be usable during build-time,
especially when cross-compiling. (E.g. when compiling for arm32 on a
x86-64 machine, the arm32 module is not usable at build time).

This makes meson fail, as it isn't able to figure out the location of
numpy headers.

To allow an alternative way to find these headers, introduce a meson
build option, where the location of the numpy headers can be specified.

In case numpy module cannot be loaded for some reason to query the
include folder location, fall back to the value of this meson option.

Upstream-Status: Submitted [https://github.com/pandas-dev/pandas/pull/61095]

Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>
---
 meson.options      |  1 +
 pandas/meson.build | 13 ++++++++++---
 2 files changed, 11 insertions(+), 3 deletions(-)
 create mode 100644 meson.options

--- /dev/null
+++ b/meson.options
@@ -0,0 +1 @@
+option('numpy_inc_dir', type : 'string', description : 'The absolute path to the numpy headers')
--- a/pandas/meson.build
+++ b/pandas/meson.build
@@ -3,17 +3,24 @@ incdir_numpy = run_command(py,
     '-c',
     '''
 import os
-import numpy as np
+
+try:
+    import numpy as np
+    base_incdir = np.get_include()
+except Exception:
+    base_incdir = os.getenv('NUMPY_INC_DIR')
+
 try:
     # Check if include directory is inside the pandas dir
     # e.g. a venv created inside the pandas dir
     # If so, convert it to a relative path
-    incdir = os.path.relpath(np.get_include())
+    incdir = os.path.relpath(base_incdir)
 except Exception:
-    incdir = np.get_include()
+    incdir = base_incdir
 print(incdir)
      '''
   ],
+  env: {'NUMPY_INC_DIR': get_option('numpy_inc_dir')},
   check: true
 ).stdout().strip()
 
