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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2013 Ludovic Courtès <ludo@gnu.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 cross-base)
+ #:use-module (guix licenses)
+ #:use-module (gnu packages)
+ #:use-module (gnu packages gcc)
+ #:use-module (gnu packages base)
+ #:use-module (gnu packages linux)
+ #:use-module (guix packages)
+ #:use-module (guix download)
+ #:use-module (guix utils)
+ #:use-module (guix build-system gnu)
+ #:use-module (guix build-system trivial)
+ #:use-module (srfi srfi-1)
+ #:use-module (srfi srfi-26)
+ #:use-module (ice-9 match))
+
+(define (cross p target)
+ (package (inherit p)
+ (location (source-properties->location (current-source-location)))
+ (name (string-append (package-name p) "-cross-" target))
+ (arguments
+ (substitute-keyword-arguments (package-arguments p)
+ ((#:configure-flags flags)
+ `(cons ,(string-append "--target=" target)
+ ,flags))))))
+
+(define cross-binutils
+ (cut cross binutils <>))
+
+(define* (cross-gcc target
+ #:optional (xbinutils (cross-binutils target)) libc)
+ "Return a cross-compiler for TARGET, where TARGET is a GNU triplet. Use
+XBINUTILS as the associated cross-Binutils. If LIBC is false, then build a
+GCC that does not target a libc; otherwise, target that libc."
+ (define args
+ ;; Get the arguments as if we were building for TARGET. In particular, we
+ ;; want `glibc-dynamic-linker' to return the right thing.
+ (parameterize ((%current-system (gnu-triplet->nix-system target)))
+ (package-arguments gcc-4.7)))
+
+ (package (inherit gcc-4.7)
+ (name (string-append "gcc-cross-"
+ (if libc "" "sans-libc-")
+ target))
+ (arguments
+ `(#:implicit-inputs? #f
+ #:modules ((guix build gnu-build-system)
+ (guix build utils)
+ (ice-9 regex)
+ (srfi srfi-1)
+ (srfi srfi-26))
+ #:patches (list (assoc-ref %build-inputs "patch/cross-env-vars"))
+
+ ,@(substitute-keyword-arguments args
+ ((#:configure-flags flags)
+ `(append (list ,(string-append "--target=" target)
+ ,@(if libc
+ '()
+ `( ;; Disable features not needed at this stage.
+ "--disable-shared" "--enable-static"
+
+ ;; Disable C++ because libstdc++'s
+ ;; configure script otherwise fails with
+ ;; "Link tests are not allowed after
+ ;; GCC_NO_EXECUTABLES."
+ "--enable-languages=c"
+
+ "--disable-threads" ; libgcc, would need libc
+ "--disable-libmudflap"
+ "--disable-libgomp"
+ "--disable-libssp"
+ "--disable-libquadmath"
+ "--disable-decimal-float" ; would need libc
+ )))
+
+ ,(if libc
+ flags
+ `(remove (cut string-match "--enable-languages.*" <>)
+ ,flags))))
+ ((#:make-flags flags)
+ (if libc
+ `(let ((libc (assoc-ref %build-inputs "libc")))
+ ;; FLAGS_FOR_TARGET are needed for the target libraries to
+ ;; receive the -Bxxx for the startfiles.
+ (cons (string-append "FLAGS_FOR_TARGET=-B" libc "/lib")
+ ,flags))
+ flags))
+ ((#:phases phases)
+ (let ((phases
+ `(alist-cons-after
+ 'install 'make-cross-binutils-visible
+ (lambda* (#:key outputs inputs #:allow-other-keys)
+ (let* ((out (assoc-ref outputs "out"))
+ (libexec (string-append out "/libexec/gcc/"
+ ,target))
+ (binutils (string-append
+ (assoc-ref inputs "binutils-cross")
+ "/bin/" ,target "-")))
+ (for-each (lambda (file)
+ (symlink (string-append binutils file)
+ (string-append libexec "/"
+ file)))
+ '("as" "ld" "nm"))
+ #t))
+ ,phases)))
+ (if libc
+ `(alist-cons-before
+ 'configure 'set-cross-path
+ (lambda* (#:key inputs #:allow-other-keys)
+ ;; Add the cross Linux headers to CROSS_CPATH, and remove
+ ;; them from CPATH.
+ (let ((libc (assoc-ref inputs "libc"))
+ (linux (assoc-ref inputs
+ "libc/cross-linux-headers")))
+ (define (cross? x)
+ ;; Return #t if X is a cross-libc or cross Linux.
+ (or (string-prefix? libc x)
+ (string-prefix? linux x)))
+
+ (setenv "CROSS_CPATH"
+ (string-append libc "/include:"
+ linux "/include"))
+ (setenv "CROSS_LIBRARY_PATH"
+ (string-append libc "/lib"))
+
+ (let ((cpath (search-path-as-string->list
+ (getenv "CPATH")))
+ (libpath (search-path-as-string->list
+ (getenv "LIBRARY_PATH"))))
+ (setenv "CPATH"
+ (list->search-path-as-string
+ (remove cross? cpath) ":"))
+ (setenv "LIBRARY_PATH"
+ (list->search-path-as-string
+ (remove cross? libpath) ":"))
+ #t)))
+ ,phases)
+ phases)))
+ ((#:strip-binaries? _)
+ ;; Disable stripping as this can break binaries, with object files
+ ;; of libgcc.a showing up as having an unknown architecture. See
+ ;; <http://lists.fedoraproject.org/pipermail/arm/2010-August/000663.html>
+ ;; for instance.
+ #f))))
+ (inputs
+ `(("patch/cross-env-vars"
+ ,(search-patch "gcc-cross-environment-variables.patch"))
+
+ ("binutils-cross" ,xbinutils)
+
+ ;; Call it differently so that the builder can check whether the "libc"
+ ;; input is #f.
+ ("libc-native" ,@(assoc-ref %final-inputs "libc"))
+
+ ;; Remaining inputs.
+ ,@(let ((inputs (append (package-inputs gcc-4.7)
+ (alist-delete "libc" %final-inputs))))
+ (if libc
+ `(("libc" ,libc)
+ ,@inputs)
+ inputs))))))
+
+(define* (cross-libc target
+ #:optional
+ (xgcc (cross-gcc target))
+ (xbinutils (cross-binutils target)))
+ "Return a libc cross-built for TARGET, a GNU triplet. Use XGCC and
+XBINUTILS and the cross tool chain."
+ (define xlinux-headers
+ (package (inherit linux-libre-headers)
+ (name (string-append (package-name linux-libre-headers)
+ "-cross-" target))
+ (arguments
+ (substitute-keyword-arguments (package-arguments linux-libre-headers)
+ ((#:phases phases)
+ `(alist-replace
+ 'build
+ (lambda _
+ (setenv "ARCH" ,(system->linux-architecture target))
+ (format #t "`ARCH' set to `~a' (cross compiling)~%" (getenv "ARCH"))
+
+ (and (zero? (system* "make" "defconfig"))
+ (zero? (system* "make" "mrproper" "headers_check"))))
+ ,phases))))
+ (inputs `(("cross-gcc" ,xgcc)
+ ("cross-binutils" ,xbinutils)
+ ,@(package-inputs linux-libre-headers)))))
+
+ (package (inherit glibc)
+ (name (string-append "glibc-cross-" target))
+ (arguments
+ (substitute-keyword-arguments
+ `(#:strip-binaries? #f ; disable stripping (see above)
+ ,@(package-arguments glibc))
+ ((#:configure-flags flags)
+ `(cons ,(string-append "--host=" target)
+ ,flags))
+ ((#:phases phases)
+ `(alist-cons-before
+ 'configure 'set-cross-linux-headers-path
+ (lambda* (#:key inputs #:allow-other-keys)
+ (let ((linux (assoc-ref inputs "cross-linux-headers")))
+ (setenv "CROSS_CPATH"
+ (string-append linux "/include"))
+ #t))
+ ,phases))))
+ (propagated-inputs `(("cross-linux-headers" ,xlinux-headers)))
+ (inputs `(("cross-gcc" ,xgcc)
+ ("cross-binutils" ,xbinutils)
+ ,@(package-inputs glibc)))))
+
+
+;;;
+;;; Concrete cross toolchains.
+;;;
+
+(define-public xgcc-mips64el
+ (let ((triplet "mips64el-linux-gnu"))
+ (cross-gcc triplet
+ (cross-binutils triplet)
+ (cross-libc triplet))))
+
+;; (define-public xgcc-armel
+;; (let ((triplet "armel-linux-gnueabi"))
+;; (cross-gcc triplet
+;; (cross-binutils triplet)
+;; (cross-libc triplet))))
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