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-rw-r--r--var/spack/repos/builtin/packages/tasmanian/package.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/var/spack/repos/builtin/packages/tasmanian/package.py b/var/spack/repos/builtin/packages/tasmanian/package.py
index f7176d31ed..ff974c79d3 100644
--- a/var/spack/repos/builtin/packages/tasmanian/package.py
+++ b/var/spack/repos/builtin/packages/tasmanian/package.py
@@ -108,6 +108,9 @@ class Tasmanian(CMakePackage, CudaPackage, ROCmPackage):
depends_on("magma@2.4.0:", when="+magma @6.0:", type=("build", "run"))
depends_on("magma@2.5.0:", when="+magma @7.0:", type=("build", "run"))
+ # https://github.com/spack/spack/issues/39536#issuecomment-1685161942
+ conflicts("^cuda@12", when="@:7.9 +cuda")
+
conflicts("+magma", when="~cuda~rocm") # currently MAGMA only works with CUDA
conflicts("+cuda", when="+rocm") # can pick CUDA or ROCm, not both