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> But for open source projects like Firefox, you should be able to compile a bit-identical release to what Mozilla provides. Pretty sure it's actually very har

by tonfa 14y ago

> But for open source projects like Firefox, you should be able to compile a bit-identical release to what Mozilla provides. Pretty sure it's actually very hard, I'd assume they use FDO in their builds.

mcpherrinm 14y ago
That's true. I know profile-guided-optimization is used for Windows builds; unsure on other platforms. Actually, this sounds like a fairly interesting project to me: Given a tool chain and a source code base, can we prove this was a possible compilation? In the case of deterministic compilers this is trivial, but as you highlight, not all optimizers are.
- LukeShu 14y ago
  I'm fairly certain that PGO is used for all of the official binaries. I do know that Arch Linux's package (which is from source, not official binaries) is compiled with PGO, so the support is definitely there.
  - Hello71 14y ago
    The scripts used to automate PGO are in the official repository.