Daan De Meyer
b77c7b7cfc
Weak symbols still introduce a version requirement on a newer libc. Resolve each libc symbol via dlsym(RTLD_DEFAULT) from a per-shim constructor and cache the result in a file-scope static instead. This avoids the version requirement, keeps the call path free of atomics (constructors run single-threaded before main() and before any signal handler can fire), and keeps dlsym() out of contexts where it is not async-signal-safe.
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