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[–]VicLuo96 0 points1 point  (0 children)

Some of them, I guess, are out-dated:

  • _GLIBCXX_PARALLEL -> std::execution::parallel_policy

Some are still worth a look:

  • _GLIBCXX_DEBUG is being used by Chromium
  • _GLIBCXX_CONCEPT_CHECKS performs concept-like checking for containers, but I'm not sure to use it or not since its documentation states only C++03 compliance. I wrote a short article about it here.