From f65b1fd7b61e7d3a5976af5d400b94bfccaaeabb Mon Sep 17 00:00:00 2001
From: eugeneswalker <38933153+eugeneswalker@users.noreply.github.com>
Date: Thu, 11 Apr 2024 18:43:32 -0700
Subject: dealii +cuda: conflicts with ^cuda@12: (#43599)

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

(limited to 'var')

diff --git a/var/spack/repos/builtin/packages/dealii/package.py b/var/spack/repos/builtin/packages/dealii/package.py
index 2176d6e179..23f1b918c0 100644
--- a/var/spack/repos/builtin/packages/dealii/package.py
+++ b/var/spack/repos/builtin/packages/dealii/package.py
@@ -289,6 +289,9 @@ class Dealii(CMakePackage, CudaPackage):
         when="@:9.4 +ginkgo ^ginkgo@1.5.0:",
     )
 
+    # deal.II's own CUDA backend does not support CUDA version 12.0 or newer.
+    conflicts("+cuda ^cuda@12:")
+
     # Check for sufficiently modern versions
     conflicts("cxxstd=11", when="@9.3:")
 
-- 
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