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01/04: gexp: 'computed-file' always uses a native Guile.

From: guix-commits
Subject: 01/04: gexp: 'computed-file' always uses a native Guile.
Date: Tue, 15 Feb 2022 04:31:46 -0500 (EST)

civodul pushed a commit to branch master
in repository guix.

commit 7f6dd3be3dceb0fda15fd02c9165614b2626813e
Author: Ludovic Court├Ęs <>
AuthorDate: Tue Feb 15 09:31:42 2022 +0100

    gexp: 'computed-file' always uses a native Guile.
    Fixes a regression whereby, when cross-compiling, 'computed-file' would
    use a cross-compiled Guile as its builder, which would fail to run.
    Regression introduced in af57d1bf6c46f47d82dbc234dde1e16fa8634e9d (the
    problem had always been there but was hidden before behind the (not guile)
    * guix/gexp.scm (computed-file-compiler): For 'guile', pass #:target #f.
    * tests/gexp.scm ("lower-object, computed-file, #:target"): New test.
 guix/gexp.scm  |  2 +-
 tests/gexp.scm | 22 ++++++++++++++++++++++
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/guix/gexp.scm b/guix/gexp.scm
index dfeadbd15d..d23683e2a6 100644
--- a/guix/gexp.scm
+++ b/guix/gexp.scm
@@ -598,7 +598,7 @@ This is the declarative counterpart of 'gexp->derivation'."
   (match file
     (($ <computed-file> name gexp guile options)
      (mlet %store-monad ((guile (lower-object (or guile (default-guile))
-                                              system #:target target)))
+                                              system #:target #f)))
        (apply gexp->derivation name gexp #:guile-for-build guile
               #:system system #:target target options)))))
diff --git a/tests/gexp.scm b/tests/gexp.scm
index 390cf7a207..bcda516623 100644
--- a/tests/gexp.scm
+++ b/tests/gexp.scm
@@ -1539,6 +1539,28 @@ importing.* \\(guix config\\) from the host"
                              (cons (derivation-file-name drv)
+(test-assertm "lower-object, computed-file, #:target"
+  (let* ((target   "i586-pc-gnu")
+         (computed (computed-file "computed-cross"
+                                  #~(symlink #$coreutils output)
+                                  #:guile (default-guile))))
+    ;; When lowered to TARGET, the derivation of COMPUTED should run natively,
+    ;; using a native Guile, but it should refer to the target COREUTILS.
+    (mlet* %store-monad ((drv    (lower-object computed (%current-system)
+                                               #:target target))
+                         (refs   (references* (derivation-file-name drv)))
+                         (guile  (lower-object (default-guile)
+                                               (%current-system)
+                                               #:target #f))
+                         (cross  (lower-object coreutils #:target target))
+                         (native (lower-object coreutils #:target #f)))
+      (return (and (string=? (derivation-system (pk 'drv drv)) 
+                   (string=? (derivation-builder drv)
+                             (string-append (derivation->output-path guile)
+                                            "/bin/guile"))
+                   (not (member (derivation-file-name native) refs))
+                   (member (derivation-file-name cross) refs))))))
 (test-assert "lower-object & gexp-input-error?"
   (guard (c ((gexp-input-error? c)
              (gexp-error-invalid-input c)))

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