From 26dcb0ffc4ee3ac94aa914db8568de3468910fc1 Mon Sep 17 00:00:00 2001
From: eugeneswalker <38933153+eugeneswalker@users.noreply.github.com>
Date: Mon, 13 Dec 2021 08:46:09 -0800
Subject: vtk-m +cuda: conflicts with cuda_arch=none (#27916)

---
 var/spack/repos/builtin/packages/vtk-m/package.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/var/spack/repos/builtin/packages/vtk-m/package.py b/var/spack/repos/builtin/packages/vtk-m/package.py
index 5eb7a68cdb..ca914fd662 100644
--- a/var/spack/repos/builtin/packages/vtk-m/package.py
+++ b/var/spack/repos/builtin/packages/vtk-m/package.py
@@ -89,6 +89,9 @@ class VtkM(CMakePackage, CudaPackage):
 
     conflicts("+hip", when="+cuda")
 
+    conflicts("+cuda", when="cuda_arch=none",
+              msg="vtk-m +cuda requires that cuda_arch be set")
+
     def cmake_args(self):
         spec = self.spec
         options = []
-- 
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