;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2023 Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>
;;;
;;; 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 aarch64-none-elf-toolchain)
  #:use-module ((guix licenses) #:prefix license:)
  #:use-module (guix gexp)
  #:use-module (guix utils)
  #:use-module (guix download)
  #:use-module (guix packages)
  #:use-module (guix build-system gnu)
  #:use-module (gnu packages cross-base)
  #:use-module (gnu packages gcc)
  #:use-module (gnu packages texinfo))

(define-public aarch64-none-elf-binutils
  (package
    (inherit (cross-binutils "aarch64-none-elf"))
    (name "aarch64-none-elf-binutils")))

(define aarch64-none-elf-gcc
  (let ((xgcc (cross-gcc "aarch64-none-elf" #:xgcc gcc #:xbinutils aarch64-none-elf-binutils)))
    (package
      (inherit xgcc)
      (name "aarch64-none-elf-gcc")
      (arguments
       (substitute-keyword-arguments (package-arguments xgcc)
         ((#:phases phases)
          #~(modify-phases #$phases
              (add-after 'set-paths 'augment-CPLUS_INCLUDE_PATH
                (lambda* (#:key inputs #:allow-other-keys)
                  (let ((gcc (assoc-ref inputs  "gcc")))
                    ;; Remove the default compiler from CPLUS_INCLUDE_PATH to
                    ;; prevent header conflict with the GCC from native-inputs.
                    (setenv "CPLUS_INCLUDE_PATH"
                            (string-join
                             (delete (string-append gcc "/include/c++")
                                     (string-split (getenv "CPLUS_INCLUDE_PATH")
                                                   #\:))
                             ":"))
                    (format #t
                            "environment variable `CPLUS_INCLUDE_PATH' changed to ~a~%"
                            (getenv "CPLUS_INCLUDE_PATH")))))
              ;; Without a working multilib build, the resulting GCC lacks
              ;; support for nearly every AARCH64-NONE-ELF chip.
              (add-after 'unpack 'fix-genmultilib
                (lambda _
                  ;; patch-shebang doesn't work here because there are actually
                  ;; several scripts inside this script, each with a #!/bin/sh
                  ;; that needs patching.
                  (substitute* "gcc/genmultilib"
                    (("#!/bin/sh") (string-append "#!" (which "sh"))))))))
         ((#:configure-flags flags)
          #~(delete "--disable-multilib" #$flags))))
      (native-search-paths
       (list (search-path-specification
              (variable "CROSS_C_INCLUDE_PATH")
              (files '("aarch64-none-elf/include")))
             (search-path-specification
              (variable "CROSS_CPLUS_INCLUDE_PATH")
              (files '("aarch64-none-elf/include")))
             (search-path-specification
              (variable "CROSS_OBJC_INCLUDE_PATH")
              (files '("aarch64-none-elf/include")))
             (search-path-specification
              (variable "CROSS_OBJCPLUS_INCLUDE_PATH")
              (files '("aarch64-none-elf/include")))
             (search-path-specification
              (variable "CROSS_LIBRARY_PATH")
              (files '("aarch64-none-elf/lib")))))
      (native-inputs
       `(("gcc" ,gcc)
         ,@(package-native-inputs xgcc))))))

(define-public aarch64-none-elf-newlib
  (package
    (name "aarch64-none-elf-newlib")
    (version "2.4.0")
    (source (origin
              (method url-fetch)
              (uri (string-append "ftp://sourceware.org/pub/newlib/newlib-"
                                  version ".tar.gz"))
              (sha256
               (base32
                "01i7qllwicf05vsvh39qj7qp5fdifpvvky0x95hjq39mbqiksnsl"))))
    (build-system gnu-build-system)
    (arguments
     `(#:out-of-source? #t
       ;; The configure flags are identical to the flags used by the "GCC ARM
       ;; embedded" project.
       #:configure-flags '("--target=aarch64-none-elf"
                           "--enable-newlib-io-long-long"
                           "--enable-newlib-register-fini"
                           "--disable-newlib-supplied-syscalls"
                           "--disable-nls")
       #:phases
       (modify-phases %standard-phases
         (add-after 'unpack 'fix-references-to-/bin/sh
           (lambda _
             (substitute* '("libgloss/aarch64/cpu-init/Makefile.in"
                            "libgloss/aarch64/Makefile.in"
                            "libgloss/libnosys/Makefile.in"
                            "libgloss/Makefile.in")
               (("/bin/sh") (which "sh")))
             #t)))))
    (native-inputs
     `(("xbinutils" ,(cross-binutils "aarch64-none-elf"))
       ("xgcc" ,aarch64-none-elf-gcc)
       ("texinfo" ,texinfo)))
    (home-page "https://www.sourceware.org/newlib/")
    (synopsis "C library for use on embedded systems")
    (description "Newlib is a C library intended for use on embedded
systems.  It is a conglomeration of several library parts that are easily
usable on embedded products.")
    (license (license:non-copyleft
              "https://www.sourceware.org/newlib/COPYING.NEWLIB"))))