gnu: Add re2c.

* gnu/packages/re2c.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add re2c.scm.

CC: ng0 <contact.ng0@cryptolab.net>
Signed-off-by: Sergei Trofimovich <slyfox@inbox.ru>
Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu/local.mk

@@ -318,6 +318,7 @@ GNU_SYSTEM_MODULES =				\
   %D%/packages/ratpoison.scm			\
   %D%/packages/rdesktop.scm			\
   %D%/packages/rdf.scm				\
+  %D%/packages/re2c.scm				\
   %D%/packages/readline.scm			\
   %D%/packages/regex.scm				\
   %D%/packages/rrdtool.scm			\

gnu/packages/re2c.scm

+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2017 Sergei Trofimovich <slyfox@inbox.ru>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU 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.
+;;;
+;;; GNU 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 GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gnu packages re2c)
+  #:use-module (guix licenses)
+  #:use-module (guix packages)
+  #:use-module (guix download)
+  #:use-module (guix build-system gnu))
+
+(define-public re2c
+  (package
+    (name "re2c")
+    (version "0.16")
+    (source (origin
+             (method url-fetch)
+             (uri (string-append "https://github.com/skvadrik/" name
+                                 "/releases/download/" version "/"
+                                 name "-" version ".tar.gz"))
+             (sha256
+              (base32
+               "114y0s4vmzip4hkf4cbz4yv8s498gzaylnphbzmwqhbn55j2bha8"))))
+    (build-system gnu-build-system)
+    (home-page "http://re2c.org/")
+    (synopsis "Lexer generator for C/C++")
+    (description
+     "@code{re2c} generates minimalistic hard-coded state machine (as opposed
+to full-featured table-based lexers).  Flexible API allows generated code
+to be wired into virtually any environment.  Instead of exposing traditional
+@code{yylex()} style API, re2c exposes its internals.  Be sure to take a look
+at examples, they cover a lot of real-world cases and shed some light on dark
+corners of re2c API.")
+    (license public-domain)))