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-rw-r--r--guix/derivations.scm8
1 files changed, 6 insertions, 2 deletions
diff --git a/guix/derivations.scm b/guix/derivations.scm
index 5c568f223b..403e86749b 100644
--- a/guix/derivations.scm
+++ b/guix/derivations.scm
@@ -873,8 +873,12 @@ derivation. It is kept as-is, uninterpreted, in the derivation."
(append (map derivation-input-path inputs)
sources)))
(drv* (set-field drv (derivation-file-name) file)))
- (hash-set! %derivation-cache file drv*)
- drv*)))
+ ;; Preserve pointer equality. This improves the performance of
+ ;; 'eq?'-memoization on derivations.
+ (or (hash-ref %derivation-cache file)
+ (begin
+ (hash-set! %derivation-cache file drv*)
+ drv*)))))
(define (invalidate-derivation-caches!)
"Invalidate internal derivation caches. This is mostly useful for