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#concrete-spec

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Spack Concrete Specs: Pinning Versions, Compilers and Build Options for Reproducible Builds

A concrete Spack spec pins exact versions, compilers, and build options into a fully resolved dependency graph. Learn how concretization works, how to verify a pinned spec, and common failure modes.

dependency-resolution reproducible-builds concrete-specTasadduq Burneyowner34.3K rep · 26 Feb 2026, 01:47 UTC