The chrono system header (/usr/include/c++/9/chrono) declares, but does not define, the static now() functions of its clocks. I also do not see an include that looks relevant. Where are these functions implemented?
Where can I find the GCC 9 implementation of std::chrono::system_clock::now()?
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In your C++ standard library implementation.
GNU compiler is shipped with GNU C++ library - libstdc++. Inside gcc source tree, you may find libstdc++-v3/chrono.cc file with the implementation of
chrono::now()function.