Merge pull request #2815 from devitocodes/patch-init-nocuda

arch: prevent erroring at init in isolation

Author: mloubout

devito/arch/archinfo.py

@@ -656,13 +656,14 @@ def check_cuda_runtime():
     driver_version = ctypes.c_int()
     runtime_version = ctypes.c_int()
 
-    if cuda.cudaDriverGetVersion(ctypes.byref(driver_version)) == 0 and \
-       cuda.cudaRuntimeGetVersion(ctypes.byref(runtime_version)) == 0:
-        driver_version = driver_version.value
-        runtime_version = runtime_version.value
-
-        driver_v = parse(str(driver_version/1000))
-        runtime_v = parse(str(runtime_version/1000))
+    # Check the get*Version call succeeds and is a non-zero value
+    call_success = cuda.cudaDriverGetVersion(ctypes.byref(driver_version)) == 0
+    call_success &= cuda.cudaRuntimeGetVersion(ctypes.byref(runtime_version)) == 0
+    call_success &= bool(driver_version.value)
+
+    if call_success:
+        driver_v = parse(str(driver_version.value/1000))
+        runtime_v = parse(str(runtime_version.value/1000))
         # First check the "major" version, known to be incompatible
         if driver_v.major < runtime_v.major:
             raise RuntimeError(