Hi all, there is some support for ccache in the tree but nothing in the way of documentation. I gave it a shot, see https://github.com/NixOS/nixpkgs/issues/2387#issuecomment-66215017, and it seems to work however it also changes the hash of stdenv.
Is there a way to change stdenv so that ccache can be turned on or off without causing rebuilds? I'm convinced that this would be a major boon for Hydra, which probably spends a lot of time compiling the same C/C++ files with the same preprocessed output. Likewise for developing expressions. Wout.
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