How to find the logarithm of an arbitrary precision number in C (on Linux)?

Question

linux

Need to quickly look up logarithms in a C program (no crosses). For basic arithmetic operations, the GMP lib is great, but something doesn’t have logarithms in it. Numbers 2048bit+. Boost will not work, you need a sish library.
If not, then maybe someone will advise a way how to count (the main thing is fast, since there are a lot of calculations), only the formula based on the Taylor expansion comes to mind.

Answer 1

They suggested that in the general case there is MPFR (GMP extension).

Answer 2

Is the standard library wrong?

Answer 3

Newton's method