From 9c7dd33a48858b7cb3cc81a99ef84048d7584cdf Mon Sep 17 00:00:00 2001
From: Ludovic Courtès <ludo@gnu.org>
Date: Thu, 9 May 2013 22:26:51 +0200
Subject: build: Make sure the user's Guile has all the required features.

* m4/guix.m4 (GUIX_ASSERT_GUILE_FEATURES): New macro.
* configure.ac: Use it.
---
 m4/guix.m4 | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'm4')

diff --git a/m4/guix.m4 b/m4/guix.m4
index 6cf1b01c90..4fdc409602 100644
--- a/m4/guix.m4
+++ b/m4/guix.m4
@@ -67,3 +67,20 @@ AC_DEFUN([GUIX_SYSTEM_TYPE], [
 
   AC_SUBST([guix_system])
 ])
+
+dnl GUIX_ASSERT_GUILE_FEATURES FEATURES
+dnl
+dnl Assert that FEATURES are provided by $GUILE.
+AC_DEFUN([GUIX_ASSERT_GUILE_FEATURES], [
+  for guix_guile_feature in $1
+  do
+    AC_MSG_CHECKING([whether $GUILE provides feature '$guix_guile_feature'])
+    if "$GUILE" -c "(exit (provided? '$guix_guile_feature))"
+    then
+      AC_MSG_RESULT([yes])
+    else
+      AC_MSG_RESULT([no])
+      AC_MSG_ERROR([$GUILE does not support feature '$guix_guile_feature', which is required.])
+    fi
+  done
+])
-- 
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