From e79281be105b16153c375af5506db31fd1e32698 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ludovic=20Court=C3=A8s?= <ludo@gnu.org>
Date: Wed, 3 Jul 2019 20:05:23 +0200
Subject: [PATCH] derivations: Work around pathological memoization behavior.

This works around <https://bugs.gnu.org/36487>.

* guix/derivations.scm (invalidate-derivation-caches!): Comment out
'hash-clear!' call.
---
 guix/derivations.scm | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/guix/derivations.scm b/guix/derivations.scm
index ebeac31877..9cacca572e 100644
--- a/guix/derivations.scm
+++ b/guix/derivations.scm
@@ -887,7 +887,10 @@ (define (invalidate-derivation-caches!)
   ;; caches when they start evaluating packages for another architecture.
   (invalidate-memoization! derivation->bytevector)
   (invalidate-memoization! derivation-path->base16-hash)
-  (hash-clear! %derivation-cache))
+
+  ;; FIXME: Comment out to work around <https://bugs.gnu.org/36487>.
+  ;; (hash-clear! %derivation-cache)
+  )
 
 (define derivation-properties
   (mlambdaq (drv)