gnu: glibc: Upgrade to 2.22.

* gnu/packages/base.scm (glibc): Upgrade to 2.22.
  (coreutils-light): New variable.
* gnu/packages/commencement.scm (locale-proof-package): New procedure.
  (%boot5-inputs): Add LD-WRAPPER, BINUTILS-FINAL, BASH-FINAL, GNU-MAKE,
  DIFFUTILS, FINDUTILS, COREUTILS-LIGHT (pass through
  'new-libc-package'), and %BOOTSTRAP-COREUTILS&CO (passed through
  'locale-proof-package'.)

gnu/packages/base.scm

@@ -284,6 +284,14 @@ functionality beyond that which is outlined in the POSIX standard.")
    (license gpl3+)
    (home-page "http://www.gnu.org/software/coreutils/")))
 
+(define-public coreutils-light
+  ;; Coreutils without its optional dependencies.
+  (package
+    (inherit coreutils)
+    (name "coreutils-light")
+    (outputs '("out"))
+    (inputs '())))
+
 (define-public gnu-make
   (package
    (name "make")
@@ -438,14 +446,14 @@ store.")
 (define-public glibc
   (package
    (name "glibc")
-   (version "2.21")
+   (version "2.22")
    (source (origin
             (method url-fetch)
             (uri (string-append "mirror://gnu/glibc/glibc-"
                                 version ".tar.xz"))
             (sha256
              (base32
-              "1f135546j34s9bfkydmx2nhh9vwxlx60jldi80zmsnln6wj3dsxf"))
+              "0j49682pm2nh4qbdw35bas82p1pgfnz4d2l7iwfyzvrvj0318wzb"))
             (snippet
              ;; Disable 'ldconfig' and /etc/ld.so.cache.  The latter is
              ;; required on LFS distros to avoid loading the distro's libc.so
@@ -471,7 +479,7 @@ store.")
       #:parallel-build? #f
 
       ;; The libraries have an empty RUNPATH, but some, such as the versioned
-      ;; libraries (libdl-2.21.so, etc.) have ld.so marked as NEEDED.  Since
+      ;; libraries (libdl-2.22.so, etc.) have ld.so marked as NEEDED.  Since
       ;; these libraries are always going to be found anyway, just skip
       ;; RUNPATH checks.
       #:validate-runpath? #f

gnu/packages/commencement.scm

@@ -660,10 +660,90 @@ exec ~a/bin/~a-~a -B~a/lib -Wl,-dynamic-linker -Wl,~a/~a \"$@\"~%"
                                               (current-source-location)
                                               #:guile %bootstrap-guile))))))
 
+(define (locale-proof-package p)
+  "Return a new package based on P that ignores 'LOCPATH'.  The result is a
+\"locale-proof\" package in the sense that it cannot end up loading locale
+data that is not in the format its libc expects.  This is useful because the
+locale binary format may change incompatibly between libc versions."
+  (package
+    (inherit p)
+    (name (string-append (package-name p) "-lp"))
+    (build-system trivial-build-system)
+    (inputs `(("original" ,p)
+              ("bash" ,bash-final)))
+    (outputs '("out"))
+    (arguments
+     '(#:modules ((guix build utils))
+       #:builder
+       (begin
+         (use-modules (guix build utils))
+
+         (let* ((out      (assoc-ref %outputs "out"))
+                (bin      (string-append out "/bin"))
+                (bash     (assoc-ref %build-inputs "bash"))
+                (binaries (assoc-ref %build-inputs "original"))
+                (programs (find-files (string-append binaries "/bin"))))
+           (define (wrap-program program)
+             (let ((base (basename program)))
+               (call-with-output-file base
+                 (lambda (port)
+                   (format port "#!~a/bin/sh
+# Unset 'LOCPATH' so that the program does not end up loading incompatible
+# locale data.
+unset LOCPATH
+exec \"~a\" \"$@\"\n"
+                           bash program)))
+               (chmod base #o755)))
+
+           (mkdir-p bin)
+           (with-directory-excursion bin
+             (for-each wrap-program programs)
+             #t)))))))
+
+(define-public ld-wrapper
+  ;; The final 'ld' wrapper, which uses the final Guile and Binutils.
+  (package (inherit ld-wrapper-boot3)
+    (name "ld-wrapper")
+    (inputs `(("guile" ,guile-final)
+              ("bash"  ,bash-final)
+              ,@(fold alist-delete (package-inputs ld-wrapper-boot3)
+                      '("guile" "bash"))))))
+
 (define %boot5-inputs
-  ;; Now with UTF-8 locale.
+  ;; Now with UTF-8 locales.  Since the locale binary format differs between
+  ;; libc versions, we have to rebuild some of the packages so that they use
+  ;; the new libc, which allows them to load locale data from
+  ;; GLIBC-UTF8-LOCALES-FINAL (remember that the bootstrap binaries were built
+  ;; with an older libc, which cannot load the new locale format.)  See
+  ;; <https://lists.gnu.org/archive/html/guix-devel/2015-08/msg00737.html>.
+  (let ((new-libc-package (compose package-with-bootstrap-guile
+                                   (cut package-with-explicit-inputs <>
+                                        %boot4-inputs
+                                        (current-source-location)
+                                        #:guile %bootstrap-guile))))
     `(("locales" ,glibc-utf8-locales-final)
-    ,@%boot4-inputs))
+      ("ld-wrapper" ,ld-wrapper)
+      ("binutils" ,binutils-final)
+      ("bash" ,bash-final)
+      ("make" ,(new-libc-package gnu-make))
+
+      ;; Some test suites (grep, Gnulib) use 'diff' to compare files in locale
+      ;; encoding, so we need support this.
+      ("diffutils" ,(new-libc-package diffutils))
+      ("findutils" ,(new-libc-package findutils))
+
+      ;; Grep's test suite uses 'timeout' from Coreutils to execute command,
+      ;; and yet these commands need to see the valid 'LOCPATH'.
+      ("coreutils" ,(new-libc-package coreutils-light))
+
+      ;; We just wrap the remaining binaries (tar, gzip, xz, etc.)  so that
+      ;; they ignore 'LOCPATH' (if they did not, they would be hit by an
+      ;; assertion failure in loadlocale.c.)
+      ("coreutils&co" ,(locale-proof-package %bootstrap-coreutils&co))
+
+      ,@(fold alist-delete %boot4-inputs
+              '("coreutils&co" "findutils" "diffutils" "make"
+                "bash" "binutils-cross" "ld-wrapper")))))
 
 (define gnu-make-final
   ;; The final GNU Make, which uses the final Guile.
@@ -673,15 +753,6 @@ exec ~a/bin/~a-~a -B~a/lib -Wl,-dynamic-linker -Wl,~a/~a \"$@\"~%"
                                    ,@%boot5-inputs)
                                  (current-source-location))))
 
-(define-public ld-wrapper
-  ;; The final `ld' wrapper, which uses the final Guile.
-  (package (inherit ld-wrapper-boot3)
-    (name "ld-wrapper")
-    (inputs `(("guile" ,guile-final)
-              ("bash"  ,bash-final)
-              ,@(fold alist-delete (package-inputs ld-wrapper-boot3)
-                      '("guile" "bash"))))))
-
 (define coreutils-final
   ;; The final Coreutils.  Treat them specially because some packages, such as
   ;; Findutils, keep a reference to the Coreutils they were built with.