Is there a way to tell nix-build that it should re-use a previously generated working directory? I realize that this would make the build less clean, but just unpacking that huge boost library archive takes a while on my machine and it would be nice if that time could be saved during package development.
You can create a separate nix expression representing the unpacked boost library, do perhaps a bit of preprocessing, and assign it to an attribute, and then in your main nix expression copy the files from that attribute. Then unpacking occurs only once. This is a bit overkill for just package development...
A trick that you can use during development is telling nix-build to retain your build directory. And then while your new build is running, quickly copy the files from the old build directory to the new directory. Hopefully in time before it does the main "make", such that it resumes where it left previously.
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