GCC optimizes std::string initialization from string constants by splitting them into 16-byte chunks that fit in XMM registers, using vectorized move instructions instead of embedding raw strings in the binary. This means common string-scanning tools like grep or binutils strings can miss critical content such as build-time absolute paths. The article explains the underlying assembly-level mechanism behind this optimization.
Background
Linux package build pipelines often scan compiled binaries for leaked build-machine paths, treating their presence as a correctness or reproducibility issue. This article reveals a practical blind spot in those scanning approaches.
- Source
- Lobsters
- Published
- Nov 12, 2026 at 10:49 PM
- Score
- 6.0 / 10