From 5d0984595c77b1b0acd84eb4684f786de5f95aff Mon Sep 17 00:00:00 2001
From: Ludovic Courtès <ludo@gnu.org>
Date: Sat, 12 Jul 2014 22:11:12 +0200
Subject: gexp: Resolve the default system at '>>=' time.

Partly fixes <http://bugs.gnu.org/18002>.
Reported by David Thompson <dthompson2@worcester.edu>.

* guix/gexp.scm (gexp->derivation): Change #:system to default #f.
  Use (%current-system) from within the 'mlet*'.
* tests/gexp.scm ("gexp->derivation, default system"): New test.
---
 tests/gexp.scm | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'tests/gexp.scm')

diff --git a/tests/gexp.scm b/tests/gexp.scm
index 60adf497ed..b0ff1019e6 100644
--- a/tests/gexp.scm
+++ b/tests/gexp.scm
@@ -211,6 +211,17 @@
     (return (string=? (readlink (string-append out "/foo"))
                       guile))))
 
+(test-assertm "gexp->derivation, default system"
+  ;; The default system should be the one at '>>=' time, not the one at
+  ;; invocation time.  See <http://bugs.gnu.org/18002>.
+  (let ((system (%current-system))
+        (mdrv   (parameterize ((%current-system "foobar64-linux"))
+                  (gexp->derivation "foo"
+                                    (gexp
+                                     (mkdir (ungexp output)))))))
+    (mlet %store-monad ((drv mdrv))
+      (return (string=? system (derivation-system drv))))))
+
 (define shebang
   (string-append (derivation->output-path guile-for-build)
                  "/bin/guile --no-auto-compile"))
-- 
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