build: Produce (guix config) instead of using compile-time tricks.

* guix/config.scm.in: New file.
* guix/utils.scm: Use it.
  (%libgcrypt): Remove.
  (%nixpkgs-directory): Don't capture the compile-time $NIXPKGS; use
  %NIXPKGS instead.
  (nixpkgs-derivation): Use %NIX-INSTANTIATE.
* pre-inst-env.in (NIX_INSTANTIATE, NIXPKGS, LIBGCRYPT): Remove.

* configure.ac: Emit `guix/config.scm'.
* Makefile.am (GOBJECTS): Add `guix/config.go'.
  (nobase_nodist_guilemodule_DATA): Add `guix/config.scm'.

1 files changed, 53 insertions, 0 deletions

diff --git a/guix/config.scm.in b/guix/config.scm.in
new file mode 100644
index 0000000000..462dcd0ed1
--- /dev/null
+++ b/guix/config.scm.in
@@ -0,0 +1,53 @@
+;;; Guix --- Nix package management from Guile.         -*- coding: utf-8 -*-
+;;; Copyright (C) 2012 Ludovic Courtès <ludo@gnu.org>
+;;;
+;;; This file is part of Guix.
+;;;
+;;; Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (guix config)
+  #:export (%guix-package-name
+            %guix-version
+            %guix-bug-report-address
+            %libgcrypt
+            %nixpkgs
+            %nix-instantiate))
+
+;;; Commentary:
+;;;
+;;; Compile-time configuration of Guix.
+;;;
+;;; Code:
+
+(define %guix-package-name
+  "@PACKAGE_NAME@")
+
+(define %guix-version
+  "@PACKAGE_VERSION@")
+
+(define %guix-bug-report-address
+  "@PACKAGE_BUGREPORT@")
+
+(define %libgcrypt
+  "@LIBGCRYPT@")
+
+(define %nixpkgs
+  (if (string=? "@NIXPKGS@" "")
+      #f
+      "@NIXPKGS@"))
+
+(define %nix-instantiate
+  "@NIX_INSTANTIATE@")
+
+;;; config.scm ends here