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fb5e22e318
This changes makes nix detect a machines available cores automatically whenever build-cores is set to 0. So far, nix simply passed NIX_BUILD_CORES=0 whenever build-cores is set to 0. (only when build-cores is unset it was detecting cores automatically) The behavior of passing NIX_BUILD_CORES=0 leads to a performance penalty when sourcing nixpkgs' generic builder's `setup.sh`, as setup.sh has to execute `nproc`. This significantly slows down sourcing of setup.sh
11 lines
236 B
Nix
11 lines
236 B
Nix
with import ./config.nix;
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{
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# Test derivation that checks the NIX_BUILD_CORES environment variable
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testCores = mkDerivation {
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name = "test-build-cores";
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buildCommand = ''
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echo "$NIX_BUILD_CORES" > $out
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'';
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};
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}
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