+ (define xhurd-headers
+ (package (inherit hurd-headers)
+ (name (string-append (package-name hurd-headers)
+ "-cross-" target))
+
+ (propagated-inputs `(("cross-mig" ,xmig)))
+ (native-inputs `(("cross-gcc" ,xgcc)
+ ("cross-binutils" ,xbinutils)
+ ("cross-mig" ,xmig)
+ ,@(alist-delete "mig"(package-native-inputs hurd-headers))))))
+
+ (define xglibc/hurd-headers
+ (package (inherit glibc/hurd-headers)
+ (name (string-append (package-name glibc/hurd-headers)
+ "-cross-" target))
+
+ (arguments
+ (substitute-keyword-arguments
+ `(#:modules ((guix build gnu-build-system)
+ (guix build utils)
+ (srfi srfi-26))
+ ,@(package-arguments glibc/hurd-headers))
+ ((#:phases phases)
+ `(alist-cons-before
+ 'pre-configure 'set-cross-headers-path
+ (lambda* (#:key inputs #:allow-other-keys)
+ (let* ((mach (assoc-ref inputs "gnumach-headers"))
+ (hurd (assoc-ref inputs "hurd-headers"))
+ (cpath (string-append mach "/include:"
+ hurd "/include")))
+ (for-each (cut setenv <> cpath)
+ '("CROSS_C_INCLUDE_PATH"
+ "CROSS_CPLUS_INCLUDE_PATH"
+ "CROSS_OBJC_INCLUDE_PATH"
+ "CROSS_OBJCPLUS_INCLUDE_PATH"))))
+ ,phases))))
+
+ (propagated-inputs `(("gnumach-headers" ,xgnumach-headers)
+ ("hurd-headers" ,xhurd-headers)))
+
+ (native-inputs `(("cross-gcc" ,xgcc)
+ ("cross-binutils" ,xbinutils)
+ ("cross-mig" ,xmig)
+ ,@(alist-delete "mig"(package-native-inputs glibc/hurd-headers))))))
+
+ (define xhurd-minimal
+ (package (inherit hurd-minimal)
+ (name (string-append (package-name hurd-minimal)
+ "-cross-" target))
+ (arguments
+ (substitute-keyword-arguments
+ `(#:modules ((guix build gnu-build-system)
+ (guix build utils)
+ (srfi srfi-26))
+ ,@(package-arguments hurd-minimal))
+ ((#:phases phases)
+ `(alist-cons-before
+ 'configure 'set-cross-headers-path
+ (lambda* (#:key inputs #:allow-other-keys)
+ (let* ((glibc-headers (assoc-ref inputs "cross-glibc-hurd-headers"))
+ (cpath (string-append glibc-headers "/include")))
+ (for-each (cut setenv <> cpath)
+ '("CROSS_C_INCLUDE_PATH"
+ "CROSS_CPLUS_INCLUDE_PATH"
+ "CROSS_OBJC_INCLUDE_PATH"
+ "CROSS_OBJCPLUS_INCLUDE_PATH"))))
+ ,phases))))
+
+ (inputs `(("cross-glibc-hurd-headers" ,xglibc/hurd-headers)))
+
+ (native-inputs `(("cross-gcc" ,xgcc)
+ ("cross-binutils" ,xbinutils)
+ ("cross-mig" ,xmig)
+ ,@(alist-delete "mig"(package-native-inputs hurd-minimal))))))
+
+ (define xhurd-core-headers
+ (package (inherit hurd-core-headers)
+ (name (string-append (package-name hurd-core-headers)
+ "-cross-" target))
+
+ (inputs `(("gnumach-headers" ,xgnumach-headers)
+ ("hurd-headers" ,xhurd-headers)
+ ("hurd-minimal" ,xhurd-minimal)))
+
+ (native-inputs `(("cross-gcc" ,xgcc)
+ ("cross-binutils" ,xbinutils)
+ ("cross-mig" ,xmig)
+ ,@(package-native-inputs hurd-core-headers)))))
+
+ (match target
+ ((or "i586-pc-gnu" "i586-gnu") xhurd-core-headers)
+ (_ xlinux-headers)))
+
+(define* (cross-libc target
+ #:optional
+ (xgcc (cross-gcc target))
+ (xbinutils (cross-binutils target))
+ (xheaders (cross-kernel-headers target)))
+ "Return a libc cross-built for TARGET, a GNU triplet. Use XGCC and
+XBINUTILS and the cross tool chain."
+ (define (cross-libc-for-target target)
+ "Return libc depending on TARGET."
+ (match target
+ ((or "i586-pc-gnu" "i586-gnu") glibc/hurd)
+ (_ glibc/linux)))
+
+ ;; Use (cross-libc-for-target ...) to determine the correct libc to use.
+ (let ((libc (cross-libc-for-target target)))
+ (package (inherit libc)
+ (name (string-append "glibc-cross-" target))
+ (arguments
+ (substitute-keyword-arguments
+ `(;; Disable stripping (see above.)
+ #:strip-binaries? #f
+
+ ;; This package is used as a target input, but it should not have
+ ;; the usual cross-compilation inputs since that would include
+ ;; itself.
+ #:implicit-cross-inputs? #f
+
+ ;; We need SRFI 26.
+ #:modules ((guix build gnu-build-system)
+ (guix build utils)
+ (srfi srfi-26))
+
+ ,@(package-arguments libc))
+ ((#:configure-flags flags)
+ `(cons ,(string-append "--host=" target)