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MinGW: Enable C++ threads with mcfgthreads for 19.09 #73265

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merged 10 commits into from Nov 12, 2019

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Ericson2314
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Motivation for this change

Backport of #73195

Things done
  • Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
  • Built on platform(s)
    • NixOS
    • macOS
    • other Linux distributions
  • Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
  • Tested compilation of all pkgs that depend on this change using nix-shell -p nix-review --run "nix-review wip"
  • Tested execution of all binary files (usually in ./result/bin/)
  • Determined the impact on package closure size (by running nix path-info -S before and after)
  • Ensured that relevant documentation is up to date
  • Fits CONTRIBUTING.md.
Notify maintainers

cc @

It is needed for the `-municode` flag, supposedly.
Also deduplicate more of the GCC derivations.
Currently this is set up to be mcfgthreads, but it could be something
else instead.
Seems to build just fine without it, maybe it was just using C++ threads
which mcfgthread provides?
Working around broken build for now.
I think those deps could be made to build, but I didn't want to get
bogged down investigating further. "Use flags" are always a good thing,
so this is fine for now.
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