[Bug]: linking error using DLIB_USE_MKL_WITH_TBB = ON

[amwink]

What Operating System(s) are you seeing this problem on?

Linux (x86-64)

dlib version

19.24.4

Python version

3.11.8

Compiler

g++ 12.3.0-5

Expected Behavior

After seeing (with cmake-gui) that libraries mkl_tbb and mkl_tbb_thread are found and setting DLIB_USE_MKL_WITH_TBB to ON, for DLib to compile using the Intel-optimised routines.

Current Behavior

With DLIB_USE_MKL_WITH_TBB set to OFF, Compilation finishes, but with DLIB_USE_MKL_WITH_TBB set to ON, it gives these errors
dlib_errors_MKL_FFT.txt

Steps to Reproduce

With the switch set to OFF it compiles, with the switch set to ON it gives these linking errors.

Anything else?

Added the option '-ltbb' ( /usr/lib/x86_64-linux-gnu/libtbb.so points to libtbb.so.12.5 ) but CMake puts it at the start, when no symbols are added.

[davisking]

You don't need to use the TBB. But if you want to you will have to figure out how to link to it for your platform and send us a PR that makes cmake know how to do it :)