I noticed that math __*_finite symbols are not present anymore in libm.so.6 on Ubuntu 20.04 (GLIBC version 2.31).

nm returns those symbols as they were present in the shared object:

nm -gD libm.so.6 | grep finite
00000000000249e0 i __acos_finite
...
000000000002c520 i __log_finite
...

But once I try to load them (for example through dynamic loading with dlopen and dlsym) I get an error that tells me that those symbols are undefined and cannot be loaded.

I tried on Ubuntu 18.04 and I'm not facing the same problem.

This is an issue for me because I'm trying to use a shared library compiled on Ubuntu 18.04 that actually uses those symbols (the library was compiled with --ffast-math).

I'm wondering what is going on there, and why those symbols are not anymore present inside libm. Is there a way to use a library that actually relies on those symbols?

Sorted by: Reset to default

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