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Mozilla Automation Teamserge-sans-paille8 min readintermediate

Pros and Cons of Unified Build

Read on github.ioHN 1·0 comments

Summary

Unified (jumbo) builds concatenate multiple C++ source files to reduce header instantiation, often halving cold compile time. However, they hurt incremental rebuilds, cache efficiency, and can change program semantics, making reproducibility and correctness harder.

  • Concatenating sources can cut cold compile time (~2x in simple examples) by sharing header instantiation.
  • Larger unification groups improve cold builds but increase incremental recompilation time and cache misses.
  • Unified builds may alter program semantics: macro redefinitions, overload conflicts, using‑namespace ambiguities, and the "reunifying problem".
  • Binary output can differ (inlining, LTO effects) depending on file grouping, hurting reproducibility.

C++ build engineers and teams that need fast compile times should care because unified builds trade cold‑build speed for reproducibility and incremental build reliability.

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