gexp: Lowering a <computed-file> honors SYSTEM and TARGET.

* guix/gexp.scm (computed-file-compiler): Pass #:system and #:target to
'gexp->derivation'.
* tests/gexp.scm ("lower-object, computed-file, #:system"): New test.

1 files changed, 19 insertions, 1 deletions

diff --git a/tests/gexp.scm b/tests/gexp.scm
index 35a76a496e..c4b437cd49 100644
--- a/tests/gexp.scm
+++ b/tests/gexp.scm
@@ -1,5 +1,5 @@
 ;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2014, 2015, 2016, 2017, 2018 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2014, 2015, 2016, 2017, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -1171,6 +1171,24 @@
                      (string=? (readlink (string-append comp "/text"))
                                text)))))))
 
+(test-equal "lower-object, computed-file, #:system"
+  '("mips64el-linux")
+  (run-with-store %store
+    (let* ((exp      #~(symlink #$coreutils #$output))
+           (computed (computed-file "computed" exp
+                                    #:guile %bootstrap-guile)))
+      ;; Make sure that the SYSTEM argument to 'lower-object' is honored.
+      (mlet* %store-monad ((drv  (lower-object computed "mips64el-linux"))
+                           (refs (references* (derivation-file-name drv))))
+        (return (delete-duplicates
+                 (filter-map (lambda (file)
+                               (and (string-suffix? ".drv" file)
+                                    (let ((drv (read-derivation-from-file
+                                                file)))
+                                      (derivation-system drv))))
+                             (cons (derivation-file-name drv)
+                                   refs))))))))
+
 (test-assert "lower-object & gexp-input-error?"
   (guard (c ((gexp-input-error? c)
              (gexp-error-invalid-input c)))