diff options
Diffstat (limited to 'guix/packages.scm')
| -rw-r--r-- | guix/packages.scm | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/guix/packages.scm b/guix/packages.scm index 8fb77e5fd7..4b687717e4 100644 --- a/guix/packages.scm +++ b/guix/packages.scm @@ -206,16 +206,23 @@ recursively." (define %derivation-cache ;; Package to derivation-path mapping. - (make-weak-key-hash-table)) + (make-weak-key-hash-table 100)) (define (cache package system drv) "Memoize DRV as the derivation of PACKAGE on SYSTEM." - (hash-set! %derivation-cache (cons package system) drv) + + ;; Use `hashq-set!' instead of `hash-set!' because `hash' returns the + ;; same value for all structs (as of Guile 2.0.6), and because pointer + ;; equality is sufficient in practice. + (hashq-set! %derivation-cache package `((,system . ,drv))) drv) (define (cached-derivation package system) "Return the cached derivation path of PACKAGE for SYSTEM, or #f." - (hash-ref %derivation-cache (cons package system))) + (match (hashq-ref %derivation-cache package) + ((alist ...) + (assoc-ref alist system)) + (#f #f))) (define* (package-derivation store package #:optional (system (%current-system))) |