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I would expect it to be extremely rare for the order of symbols within a binary to hide or expose bugs in the application. It's not like compiler optimizations where semi-random inlining decisions can allow for further optimizations, with a cascading effect on whether undefined behavior gets noticed or what kind of code gets generated, etc. Linkers are much simpler and lower level than that, in the absence of LTO.

Anyway, many people already develop without optimizations and release with them, which is far more likely to result in heisenbugs even if it's technically a deterministic process. For that matter, I'm only proposing to use incremental linking in debug builds, so most of the time you'd only end up with nondeterminism if you were already going to get an output binary substantially different from a release-mode one. The only exception is if you have optimizations enabled in debug builds.




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