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Diffstat (limited to 'third_party/nix/src')
| -rw-r--r-- | third_party/nix/src/libexpr/eval.cc | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/third_party/nix/src/libexpr/eval.cc b/third_party/nix/src/libexpr/eval.cc index 56e400620424..a834e097a5cf 100644 --- a/third_party/nix/src/libexpr/eval.cc +++ b/third_party/nix/src/libexpr/eval.cc @@ -1667,6 +1667,12 @@ bool EvalState::eqValues(Value& v1, Value& v2) { return true; case tAttrs: { + // As an optimisation if both values are pointing towards the + // same attribute set, we can skip all this extra work. + if (v1.attrs == v2.attrs) { + return true; + } + /* If both sets denote a derivation (type = "derivation"), then compare their outPaths. */ if (isDerivation(v1) && isDerivation(v2)) { |