Elfhack

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elfhack is a part of the Mozilla build system that optimizes relocations in compiled libraries. For more information about elfhack, see:

bug 606145 - Compress/pack relocations in ELF binaries (elfhack)
Improving libxul startup I/O by hacking the ELF format with elfhack
Link-Time Optimization (LTO)
- Update: Original blog post is gone, related blog post can be found in Web Archive: LTO with elfhack