GPU CUDA variant of ISSM#35
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In +ad builds PVec resolves to adjoint_petsc::ADVec (ADVecImpl*) which is not compatible with VecScatterCreate*/VecGetArrayRead — those APIs only accept plain Vec. +cuda and +ad are mutually exclusive (Spack conflict), so: _HAVE_PETSC_CUDA_ defined -> scatter / VecGetArrayRead (Vec only) _HAVE_PETSC_CUDA_ not set -> original VecGetValues path (handles ADVec) Fixes CI failure in gcc-ad build (PR #35).
The strncmp commit accidentally dropped the preallocation call, closing braces and return statement, leaving only the fold marker. Restore them.
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