The current patch so you can have a better look.
From 8f8f74da2ee0f7da8d00b75d16f0089c8a73d72b Mon Sep 17 00:00:00 2001
From: Manolis Ragkousis <manolis...@gmail.com>
Date: Sat, 22 Mar 2014 18:01:29 +0000
Subject: [PATCH] gnu: base: Added macro for choosing glibc for target system
* gnu/packages/base.scm (glibc/linux): Renamed glibc to glibc/linux
* gnu/packages/base.scm (glibc-for-target): Choose which glibc to use
* gnu/packages/base.scm (glibc): Added macro to choose glibc
---
gnu/packages/base.scm | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/gnu/packages/base.scm b/gnu/packages/base.scm
index 906d0a3..c90d1fc 100644
--- a/gnu/packages/base.scm
+++ b/gnu/packages/base.scm
@@ -39,7 +39,8 @@
#:use-module (guix utils)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
- #:use-module (ice-9 match))
+ #:use-module (ice-9 match)
+ #:export (glibc))
;;; Commentary:
;;;
@@ -353,7 +354,7 @@ library for working with executable and object formats is also included.")
(license gpl3+)
(home-page "http://www.gnu.org/software/binutils/";)))
-(define-public glibc
+(define-public glibc/linux
(package
(name "glibc")
(version "2.18")
@@ -1091,4 +1092,14 @@ store.")
("gcc" ,gcc-final)
("libc" ,glibc-final))))
+(define (glibc-for-target target)
+ "Return the glibc for TARGET, glibc/linux for a linux host or
+glibc/hurd for a hurd host"
+ (match target
+ ("i686-pc-gnu" glibc/hurd)
+ (_ glibc/linux)))
+
+(define-syntax glibc
+ (identifier-syntax (glibc-for-target (or (%current-target-system) (%current-system)))))
+
;;; base.scm ends here
--
1.9.0
