build-systems: gnu: Export %default-gnu-imported-modules and %default-gnu-modules.

Until now users would have to cargo cult or inspect the private
%default-modules variable of (guix build-systems gnu) to discover which
modules to include when extending the used modules via the #:modules argument.

The renaming was automated via the command:

  $ git grep -l %gnu-build-system-modules
    | xargs sed 's/%gnu-build-system-modules/%default-gnu-imported-modules/' -i

* guix/build-system/gnu.scm (%gnu-build-system-modules): Rename to...
(%default-gnu-imported-modules): ... this.
(%default-modules): Rename to...
(%default-gnu-modules): ... this.  Export.
(dist-package, gnu-build, gnu-cross-build): Adjust accordingly.

Change-Id: Idef307fff13cb76f3182d782b26e1cd3a5c757ee

1 files changed, 4 insertions, 4 deletions

diff --git a/tests/modules.scm b/tests/modules.scm
index bb2c70e287e..4a42da25b70 100644
--- a/tests/modules.scm
+++ b/tests/modules.scm
@@ -18,7 +18,7 @@
 
 (define-module (test-modules)
   #:use-module (guix modules)
-  #:use-module ((guix build-system gnu) #:select (%gnu-build-system-modules))
+  #:use-module ((guix build-system gnu) #:select (%default-gnu-imported-modules))
   #:use-module ((guix utils) #:select (call-with-temporary-directory))
   #:use-module (srfi srfi-1)
   #:use-module (srfi srfi-34)
@@ -30,9 +30,9 @@
   (lset= equal?
          (live-module-closure '((guix build gnu-build-system)))
          (source-module-closure '((guix build gnu-build-system)))
-         %gnu-build-system-modules
-         (source-module-closure %gnu-build-system-modules)
-         (live-module-closure %gnu-build-system-modules)))
+         %default-gnu-imported-modules
+         (source-module-closure %default-gnu-imported-modules)
+         (live-module-closure %default-gnu-imported-modules)))
 
 (test-assert "closure of (gnu build install)"
   (lset= equal?