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Adding contracts to the GCC GNAT Ada standard libraries

Talkat FOSDEM 2021 · on Saturday, 2021-02-06· at 11:00· D.safety· [compilers-and-language-design, software-architecture]

Describes adding Ada 2012-style contracts (preconditions, postconditions, and other annotations) into GCC GNAT’s Ada standard libraries so SPARK users can get stronger formal proofs when their code uses those libraries. Explains which library APIs were annotated and how different levels of contracts range from preventing certain run-time errors to fully specifying library behavior for verification.

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