02/43: gnu: Add rust-autocfg.

[guix-commits]

efraim pushed a commit to branch master
in repository guix.

commit 060958949a894f3205523fe9e1f5b5e6bde105de
Author: Efraim Flashner <address@hidden>
Date:   Sun Aug 4 12:48:46 2019 +0300

    gnu: Add rust-autocfg.
    
    * gnu/packages/crates-io.scm (rust-autocfg): New variable.
---
 gnu/packages/crates-io.scm | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/gnu/packages/crates-io.scm b/gnu/packages/crates-io.scm
index 064ce06..d4160b6 100644
--- a/gnu/packages/crates-io.scm
+++ b/gnu/packages/crates-io.scm
@@ -1,5 +1,6 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2019 Ivan Petkov <address@hidden>
+;;; Copyright © 2019 Efraim Flashner <address@hidden>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -26,6 +27,28 @@
 ;;; Please: Try to add new module packages in alphabetic order.
 ;;;
 
+(define-public rust-autocfg
+  (package
+    (name "rust-autocfg")
+    (version "0.1.5")
+    (source
+      (origin
+        (method url-fetch)
+        (uri (crate-uri "autocfg" version))
+        (file-name (string-append name "-" version ".tar.gz"))
+        (sha256
+         (base32
+          "0asl6fnc35yk5l2rxwhp25v128jgm45dp754h9z8x51b6n90w4r2"))))
+    (build-system cargo-build-system)
+    (home-page "https://github.com/cuviper/autocfg";)
+    (synopsis "Automatic cfg for Rust compiler features")
+    (description "Rust library for build scripts to automatically configure
+code based on compiler support.  Code snippets are dynamically tested to see
+if the @code{rustc} will accept them, rather than hard-coding specific version
+support.")
+    (license (list license:asl2.0
+                   license:expat))))
+
 (define-public rust-proc-macro2
   (package
     (name "rust-proc-macro2")