Try to compile it with that compiler settings:
g++ –std=c++14 -pthread
Hint comes from here:
https://www.geeksforgeeks.org/thread-hardware_concurrency-function-in-c/amp/
Sent from my iPhone
On 24.08.2019, at 20:05, Adrian C via Boost-users <
boost-users@lists.boost.org
> wrote:
undefined reference to `std::thread::hardware_concurrency()'