;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2016 Ricardo Wurmus <rekado@elephly.net>
;;;
;;; 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 embedded)
  #:use-module (guix utils)
  #:use-module (guix packages)
  #:use-module (guix download)
  #:use-module (guix svn-download)
  #:use-module (guix git-download)
  #:use-module ((guix licenses) #:prefix license:)
  #:use-module (guix build-system gnu)
  #:use-module (gnu packages)
  #:use-module (gnu packages cross-base)
  #:use-module (gnu packages flex)
  #:use-module (gnu packages perl)
  #:use-module (gnu packages texinfo))

;; We must not use the released GCC sources here, because the cross-compiler
;; does not produce working binaries.  Instead we take the very same SVN
;; revision from the branch that is used for a release of the "GCC ARM
;; embedded" project on launchpad.
;; See https://launchpadlibrarian.net/218827644/release.txt
(define-public gcc-arm-none-eabi-4.9
  (let ((xgcc (cross-gcc "arm-none-eabi"
                         (cross-binutils "arm-none-eabi")))
        (revision "1")
        (svn-revision 227977))
    (package (inherit xgcc)
      (version (string-append (package-version xgcc) "-"
                              revision "." (number->string svn-revision)))
      (source
       (origin
         (method svn-fetch)
         (uri (svn-reference
               (url "svn://gcc.gnu.org/svn/gcc/branches/ARM/embedded-4_9-branch/")
               (revision svn-revision)))
         (file-name (string-append "gcc-arm-embedded-" version "-checkout"))
         (sha256
          (base32
           "113r98kygy8rrjfv2pd3z6zlfzbj543pq7xyq8bgh72c608mmsbr"))
         (patches (origin-patches (package-source xgcc)))))
      (native-inputs
       `(("flex" ,flex)
         ,@(package-native-inputs xgcc)))
      (arguments
       (substitute-keyword-arguments (package-arguments xgcc)
         ((#:phases phases)
          `(modify-phases ,phases
             (add-after 'unpack 'fix-genmultilib
               (lambda _
                 (substitute* "gcc/genmultilib"
                   (("#!/bin/sh") (string-append "#!" (which "sh"))))
                 #t))))
         ((#:configure-flags flags)
          ;; The configure flags are largely identical to the flags used by the
          ;; "GCC ARM embedded" project.
          `(append (list "--enable-multilib"
                         "--with-newlib"
                         "--with-multilib-list=armv6-m,armv7-m,armv7e-m"
                         "--with-host-libstdcxx=-static-libgcc -Wl,-Bstatic,-lstdc++,-Bdynamic -lm"
                         "--enable-plugins"
                         "--disable-decimal-float"
                         "--disable-libffi"
                         "--disable-libgomp"
                         "--disable-libmudflap"
                         "--disable-libquadmath"
                         "--disable-libssp"
                         "--disable-libstdcxx-pch"
                         "--disable-nls"
                         "--disable-shared"
                         "--disable-threads"
                         "--disable-tls")
                   (delete "--disable-multilib" ,flags)))))
      (native-search-paths
       (list (search-path-specification
              (variable "CROSS_C_INCLUDE_PATH")
              (files '("arm-none-eabi/include")))
             (search-path-specification
              (variable "CROSS_CPLUS_INCLUDE_PATH")
              (files '("arm-none-eabi/include")))
             (search-path-specification
              (variable "CROSS_LIBRARY_PATH")
              (files '("arm-none-eabi/lib"))))))))