Add flag for NCrystal

include/openmc/settings.h

@@ -20,6 +20,8 @@ namespace openmc {
 // Global variable declarations
 //==============================================================================
 
+extern "C" const bool NCRYSTAL_ENABLED;
+
 namespace settings {
 
 // Boolean flags

openmc/lib/__init__.py

@@ -42,6 +42,9 @@ else:
 def _dagmc_enabled():
     return c_bool.in_dll(_dll, "DAGMC_ENABLED").value
 
+def _ncrystal_enabled():
+    return c_bool.in_dll(_dll, "NCRYSTAL_ENABLED").value
+
 def _coord_levels():
     return c_int.in_dll(_dll, "n_coord_levels").value
 

src/settings.cpp

@@ -36,6 +36,13 @@ namespace openmc {
 // Global variables
 //==============================================================================
 
+#ifdef NCRYSTAL
+const bool NCRYSTAL_ENABLED = true;
+#else
+const bool NCRYSTAL_ENABLED = false;
+#endif
+
+
 namespace settings {
 
 // Default values for boolean flags

tests/regression_tests/ncrystal/test.py

@@ -1,7 +1,14 @@
 import numpy as np
 import openmc
+import openmc.lib
+import pytest
+
 from tests.testing_harness import PyAPITestHarness
 
+pytestmark = pytest.mark.skipif(
+    not openmc.lib._ncrystal_enabled(),
+    reason="NCrystal materials are not enabled.")
+
 def compute_angular_distribution(cfg, E0, N):
     """Return a openmc.model.Model() object for a monoenergetic pencil
      beam hitting a 1 mm sphere filled with the material defined by