Reproducible builds, also known as deterministic compilation, is a process of compiling software which ensures the resulting binary code can be reproduced. Source code compiled using deterministic compilation will always output the same binary.
For the compilation process to be deterministic, the input to the compiler must be the same, regardless of the build environment used. This typically involves normalizing variables that may change, such as order of input files, timestamps, locales, and paths.
Additionally, the compilers must not introduce non-determinism themselves. This sometimes happens when using hash tables with a random hash seed value. It can also happen when using the address of variables because that varies from address space layout randomization (ASLR).
One of the older projects to promote reproducible builds is the Bitcoin project with Gitian. Later, in 2013, the Tor (anonymity network) project started using Gitian for their reproducible builds.
By July 2017 more than 90% of the packages in the repository have been proven to build reproducibly.
- "reproducible-builds.org". reproducible-builds.org. Archived from the original on 20 May 2016. Retrieved 22 August 2016.
Reproducible builds are a set of software development practices which create a verifiable path from human readable source code to the binary code used by computers....build system needs to be made entirely deterministic: transforming a given source must always create the same result.
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