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gnu: Add function libiconv-if-needed. 

* gnu/packages/base.scm (libiconv-if-needed): New function.
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Jan Nieuwenhuizen 2016-05-03 18:49:33 +02:00 committed by Ludovic Courtès
parent cba36e6482
commit 4dab8c5906
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1 changed files with 12 additions and 1 deletions
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13
gnu/packages/base.scm
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@ -46,7 +46,8 @@
#:use-module (guix build-system gnu)
#:use-module (guix build-system trivial)
#:use-module (ice-9 match)
#:export (glibc))
#:export (glibc
libiconv-if-needed))
;;; Commentary:
;;;
@ -1032,6 +1033,16 @@ program. It supports a wide variety of different encodings.")
(home-page "http://www.gnu.org/software/libiconv/")
(license lgpl3+)))
(define* (libiconv-if-needed #:optional (target (%current-target-system)))
"Return either a libiconv package specification to include in a dependency
list for platforms that have an incomplete libc, or the empty list. If a
package needs iconv ,@(libiconv-if-needed) should be added."
;; POSIX C libraries provide iconv. Platforms with an incomplete libc
;; without iconv, such as MinGW, must return the then clause.
(if (target-mingw? target)
`(("libiconv" ,libiconv))
'()))
(define-public (canonical-package package)
;; Avoid circular dependency by lazily resolving 'commencement'.
(let* ((iface (resolve-interface '(gnu packages commencement)))