From 7a25947b6664ee9b192ea2d767bb36d133de57c4 Mon Sep 17 00:00:00 2001
From: Patrick Avery <patrick.avery@kitware.com>
Date: Wed, 18 Oct 2023 16:06:21 -0500
Subject: [PATCH] Try cross-compiling for arm64 on osx

Something like this should be possible...

Signed-off-by: Patrick Avery <patrick.avery@kitware.com>
---
 conda.recipe/conda_build_config.yaml |  9 +++++++++
 conda.recipe/meta.yaml               | 16 ++++++++++++----
 2 files changed, 21 insertions(+), 4 deletions(-)

diff --git a/conda.recipe/conda_build_config.yaml b/conda.recipe/conda_build_config.yaml
index 77f0eec0a..26d5d326b 100644
--- a/conda.recipe/conda_build_config.yaml
+++ b/conda.recipe/conda_build_config.yaml
@@ -2,3 +2,12 @@ python:
   - 3.9
   - 3.10
   - 3.11
+c_compiler:
+  - gcc                    # [linux]
+  - clang                  # [osx]
+  - vs2019                 # [win]
+target_platform:
+  - linux-64               # [linux]
+  - osx-64                 # [osx]
+  - osx-arm64              # [osx]
+  - win-64                 # [win]
diff --git a/conda.recipe/meta.yaml b/conda.recipe/meta.yaml
index 229760264..fb9e7c416 100644
--- a/conda.recipe/meta.yaml
+++ b/conda.recipe/meta.yaml
@@ -13,12 +13,20 @@ build:
 
 requirements:
   build:
-    # Numba is only here to ensure the numpy version is compatible
-    - numba
-    - numpy >=1.20
+    # This is so that we can build cross-platform for osx-arm64
+    - {{ compiler('c') }}
+    - python {{ python }}                    # [build_platform != target_platform]
+    - cross-python_{{ target_platform }}     # [build_platform != target_platform]
+    - numpy >=1.25                           # [build_platform != target_platform]
+    # Numba is only here to make sure we use a version of numpy that is compatible
+    - numba                                  # [build_platform != target_platform]
+  host:
     - python {{ python }}
+    - numpy >=1.25
     - setuptools
     - setuptools_scm
+    # Numba is only here to make sure we use a version of numpy that is compatible
+    - numba
 
   run:
     - appdirs
@@ -30,7 +38,7 @@ requirements:
     - h5py
     - lmfit
     - numba
-    - numpy >=1.20
+    - {{ pin_compatible('numpy') }}
     - psutil
     - pycifrw
     - python