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LD_PRELOAD: What is it and how to use it
(typekmatus.blogspot.com)
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this post was submitted on 26 Oct 2025
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But LD_PRELOAD doesn't really have much to do with build time behavior (unless you're talking about replacing parts of the compiler) - it allows you to force a shared library to be loaded with higher priority than anything else, so it overrides symbols from other libraries.
It is recognized and used by Linux's dynamic linker, which is run-time, not build-time.