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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013, 2014, 2015, 2016 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2014, 2015, 2018 Mark H Weaver <mhw@netris.org>
;;; Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
;;; Copyright © 2016 Manolis Fragkiskos Ragkousis <manolis837@gmail.com>
;;;
;;; 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 build cross-toolchain)
#:use-module (guix build utils)
#:use-module (guix build gnu-build-system)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#:use-module (ice-9 match)
#:use-module (ice-9 ftw)
#:export (cross-gcc-build-phases))
;;; Commentary:
;;;
;;; This module provides tools to build a cross-compiler.
;;;
;;; Code:
(define %gcc-include-paths
;; Environment variables for header search paths.
;; Note: See <http://bugs.gnu.org/22186> for why not 'CPATH'.
'("C_INCLUDE_PATH"
"CPLUS_INCLUDE_PATH"
"OBJC_INCLUDE_PATH"
"OBJCPLUS_INCLUDE_PATH"))
(define %gcc-cross-include-paths
;; Search path for target headers when cross-compiling.
(map (cut string-append "CROSS_" <>) %gcc-include-paths))
(define* (make-cross-binutils-visible #:key outputs inputs target
#:allow-other-keys)
"Create symlinks for 'as', 'nm', and 'ld' in the \"out\" output, under
libexec/gcc, so that the cross-GCC can find them."
(let* ((out (assoc-ref outputs "out"))
(libexec (string-append out "/libexec/gcc/" target))
(binutils (string-append (assoc-ref inputs "binutils-cross")
"/bin/" target "-"))
(wrapper (string-append (assoc-ref inputs "ld-wrapper-cross")
"/bin/" target "-ld")))
(for-each (lambda (file)
(symlink (string-append binutils file)
(string-append libexec "/" file)))
'("as" "nm"))
(symlink wrapper (string-append libexec "/ld"))
#t))
(define* (set-cross-path #:key inputs #:allow-other-keys)
"Add the cross kernel headers to CROSS_CPATH, and remove them from
C_INCLUDE_PATH et al."
(match (assoc-ref inputs "libc")
((? string? libc)
(let ((kernel (assoc-ref inputs "xkernel-headers")))
(define (cross? x)
;; Return #t if X is a cross-libc or cross Linux.
(or (string-prefix? libc x)
(string-prefix? kernel x)))
(let ((cpath (string-append libc "/include"
":" kernel "/include")))
(for-each (cut setenv <> cpath)
%gcc-cross-include-paths))
(setenv "CROSS_LIBRARY_PATH"
(string-append libc "/lib:" kernel "/lib")) ;for Hurd's libihash
(for-each (lambda (var)
(and=> (getenv var)
(lambda (value)
(let* ((path (search-path-as-string->list value))
(native-path (list->search-path-as-string
(remove cross? path) ":")))
(setenv var native-path)))))
(cons "LIBRARY_PATH" %gcc-include-paths))
#t))
(#f
;; We're building the sans-libc cross-compiler, so nothing to do.
#t)))
(define* (set-cross-path/mingw #:key inputs #:allow-other-keys)
"Add the cross MinGW headers to CROSS_C_*_INCLUDE_PATH, and remove them from
C_*INCLUDE_PATH."
(let ((libc (assoc-ref inputs "libc"))
(gcc (assoc-ref inputs "gcc")))
(define (cross? x)
(and libc (string-prefix? libc x)))
(define (unpacked-mingw-dir)
(match (scandir "." (lambda (name)
(string-contains name "mingw-w64")))
((mingw-dir)
(string-append
(getcwd) "/" mingw-dir "/mingw-w64-headers"))))
(if libc
(let ((cpath (string-append libc "/include"
":" libc "/i686-w64-mingw32/include")))
(for-each (cut setenv <> cpath)
%gcc-cross-include-paths))
;; libc is false, so we are building xgcc-sans-libc.
;; Add essential headers from mingw-w64.
(let ((mingw-source (assoc-ref inputs "mingw-source")))
(invoke "tar" "xvf" mingw-source)
(let ((mingw-headers (unpacked-mingw-dir)))
;; We need _mingw.h which will gets built from _mingw.h.in by
;; mingw-w64's configure. We cannot configure mingw-w64 until we
;; have xgcc-sans-libc; substitute to the rescue.
(copy-file (string-append mingw-headers "/crt/_mingw.h.in")
(string-append mingw-headers "/crt/_mingw.h"))
(substitute* (string-append mingw-headers "/crt/_mingw.h")
(("@MINGW_HAS_SECURE_API@")
"#define MINGW_HAS_SECURE_API 1"))
(let ((cpath (string-append mingw-headers "/include"
":" mingw-headers "/crt"
":" mingw-headers
"/defaults/include")))
(for-each (cut setenv <> cpath)
(cons "CROSS_LIBRARY_PATH"
%gcc-cross-include-paths))))))
(when libc
(setenv "CROSS_LIBRARY_PATH"
(string-append libc "/lib"
":" libc "/i686-w64-mingw32/lib")))
(setenv "CPP" (string-append gcc "/bin/cpp"))
(for-each (lambda (var)
(and=> (getenv var)
(lambda (value)
(let* ((path (search-path-as-string->list
value))
(native-path (list->search-path-as-string
(remove cross? path) ":")))
(setenv var native-path)))))
(cons "LIBRARY_PATH" %gcc-include-paths))
#t))
(define (install-strip . _)
"Install a stripped GCC."
;; Unlike our 'strip' phase, this will do the right thing for
;; cross-compilers.
(invoke "make" "install-strip"))
(define* (cross-gcc-build-phases target
#:optional (phases %standard-phases))
"Modify PHASES to include everything needed to build a cross-GCC for TARGET,
a target triplet."
(modify-phases phases
(add-before 'configure 'set-cross-path
(if (string-contains target "mingw")
set-cross-path/mingw
set-cross-path))
(add-after 'install 'make-cross-binutils-visible
(cut make-cross-binutils-visible #:target target <...>))
(replace 'install install-strip)))
;;; cross-toolchain.scm ends here
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