MAINT: Test during import to detect bugs with Accelerate(MacOS) LAPACK (#15695)

* TST: Test during import to detect bugs with Accelerate(MacOS) LAPACK

fixes #15647

* Pipeline update for Accelerate(MacOS) testing

1 files changed, 32 insertions, 0 deletions

diff --git a/numpy/__init__.py b/numpy/__init__.py
index ba35224e6..1d8570f71 100644
--- a/numpy/__init__.py
+++ b/numpy/__init__.py
@@ -254,3 +254,35 @@ else:
 
     _sanity_check()
     del _sanity_check
+
+    def _mac_os_check():
+        """
+        Quick Sanity check for Mac OS look for accelerate build bugs.
+        Testing numpy polyfit calls init_dgelsd(LAPACK)
+        """
+        try:
+            c = array([3., 2., 1.])
+            x = linspace(0, 2, 5)
+            y = polyval(c, x)
+            _ = polyfit(x, y, 2, cov=True)
+        except ValueError:
+            pass
+
+    import sys
+    if sys.platform == "darwin":
+        with warnings.catch_warnings(record=True) as w:
+            _mac_os_check()
+            # Throw runtime error, if the test failed Check for warning and error_message
+            error_message = ""
+            if len(w) > 0:
+                error_message = "{}: {}".format(w[-1].category.__name__, str(w[-1].message))
+                msg = (
+                    "Polyfit sanity test emitted a warning, most likely due "
+                    "to using a buggy Accelerate backend. "
+                    "If you compiled yourself, "
+                    "see site.cfg.example for information. "
+                    "Otherwise report this to the vendor "
+                    "that provided NumPy.\n{}\n".format(
+                        error_message))
+                raise RuntimeError(msg)
+    del _mac_os_check