gcc6: don’t link libstdc++ to CoreFoundation#267773
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Using flat namespaces causes libstdc++ to link CoreFoundation, but that fails after NixOS#265102. Since CoreFoundation is not actually needed, disable flat namespaces to avoid linking it unnecessarily. Disabling flat namespaces matches the behavior of newer versions of libstdc++ (GCC 7+) when building for newer Darwin hosts (10.5+).
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Description of changes
Fixes the build failure of GCC 6 on x86_64-darwin on staging-next #263535. Targeting master because this causes a limited number of rebuilds, and the patch also applies there.
https://hydra.nixos.org/build/240799330
Using flat namespaces causes libstdc++ to link CoreFoundation, but that fails after #265102. Since CoreFoundation is not actually needed, disable flat namespaces to avoid linking it unnecessarily.
Disabling flat namespaces matches the behavior of newer versions of libstdc++ (GCC 7+) when building for newer Darwin hosts (10.5+).
Things done
nix.conf? (See Nix manual)sandbox = relaxedsandbox = truenix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage./result/bin/)