Steps to reproduce

When nvhpc has not already been installed, spack spec quantum-espresso+cuda gives an unexpected result, it concretizes to quantum-espresso %c,cxx=fortran=gcc@15, despite having variant('cuda') inside a with when('%nvhpc').

Information on your system

• Spack: 1.1.0.dev0 (a91d08d)
• Builtin repo: spack/spack-packages@24108c3
• Python: 3.13.7
• Platform: linux-arch-skylake

General information

• I have run spack debug report and reported the version of Spack/Python/Platform
• I have searched the issues of this repo and believe this is not a duplicate
• I have run the failing commands in debug mode and reported the output