C++ armadillo linear algebra library linker error with GCC

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I'm getting the following error with GCC >=9 and std>=11 merely by adding the header (MacOSX on MacBook Pro 2020 and armadillo installed with Homebrew and compiled with standard CMake configuration) #include <armadillo> to my project.

Undefined symbols for architecture x86_64: "___emutls_v._ZN4arma19mt19937_64_instanceE", referenced from: __GLOBAL__sub_I_Test_HPP.cpp in Test_HPP.cpp.o ld: symbol(s) not found for architecture x86_64 collect2: error: ld returned 1 exit status make[2]: *** [Test_HPP] Error 1 make[1]: *** [CMakeFiles/Test_HPP.dir/all] Error 2

I've tried various hacks including optimization flags e.g. O2, O3 etc. but finally adding the preprocessor header #define ARMA_DONT_USE_WRAPPER apparently resolved the issue for now but I need an explanation to feel settled. If the above pre-processor is absolutely necessary to compile the code, should the armadillo library maintainers absorb the macro within the library itself? This kind of issues may take a lot of time to resolve as it is not originated in any programming logic.



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