Start on a check for the OpenMP issue, but need to learn what the error message looks like and can't reproduce locally, so pushing this to find out from the GHA wheel

Author: jobovy

galpy/util/_load_extension_libs.py

@@ -1,5 +1,6 @@
 # _load_extension_libs.py: centralized place to load the C extensions
 import ctypes
+import subprocess
 import sys
 import sysconfig
 import warnings
@@ -19,8 +20,38 @@
 _libgalpy_actionAngleTorus = None
 _libgalpy_actionAngleTorus_loaded = None
 
+_checked_openmp_issue = False
 
-def load_libgalpy():
+
+def _check_openmp_issue():
+    # Check whether we get an error of the type "OMP: Error #15: Initializing libomp.dylib, but found libomp.dylib already initialized.", which occurs, e.g., when using pip-installed galpy with conda-installed numpy and causes segmentation faults and general issues
+    # This is a known issue with OpenMP and is not galpy's fault (GitHub Copilot suggested this comment!)
+
+    # Check this by running a subprocess that imports galpy.orbit
+    proc = subprocess.run(
+        [
+            sys.executable,
+            "-c",
+            "from galpy.util._load_extension_libs import load_libgalpy; load_libgalpy(check_openmp_issue=False)",
+        ],
+        check=True,
+        capture_output=True,
+    )
+    print(proc.stdout)
+    print(proc.stderr)
+    print(proc.returncode)
+    global _checked_openmp_issue
+    _checked_openmp_issue = True
+    return False
+
+
+def load_libgalpy(check_openmp_issue=True):
+    if check_openmp_issue and not _checked_openmp_issue:
+        _check_openmp_issue()
+    else:
+        print(
+            f"Not checking for OpenMP issue and _checked_openmp_issue={_checked_openmp_issue}"
+        )
     global _libgalpy
     global _libgalpy_loaded
     if _libgalpy_loaded is False or not _libgalpy is None: