gnu: Switch to GCC 4.8 as the default compiler.

* gnu/packages/base.scm (gcc-boot0, cross-gcc-wrapper, gcc-final): Base
  on GCC-4.8.
* gnu/packages/cross-base.scm (cross-gcc): Likewise.
* gnu/packages/make-bootstrap.scm (package-with-relocatable-glibc,
  %gcc-static, %gcc-stripped): Likewise.

gnu/packages/base.scm

@@ -642,7 +642,7 @@ identifier SYSTEM."
 
 (define gcc-boot0
   (package-with-bootstrap-guile
-   (package (inherit gcc-4.7)
+   (package (inherit gcc-4.8)
      (name "gcc-cross-boot0")
      (arguments
       `(#:guile ,%bootstrap-guile
@@ -652,7 +652,7 @@ identifier SYSTEM."
                    (ice-9 regex)
                    (srfi srfi-1)
                    (srfi srfi-26))
-        ,@(substitute-keyword-arguments (package-arguments gcc-4.7)
+        ,@(substitute-keyword-arguments (package-arguments gcc-4.8)
             ((#:configure-flags flags)
              `(append (list ,(string-append "--target=" (boot-triplet))
 
@@ -716,7 +716,7 @@ identifier SYSTEM."
                     (with-directory-excursion
                         (string-append out "/lib/gcc/"
                                        ,(boot-triplet)
-                                       "/" ,(package-version gcc-4.7))
+                                       "/" ,(package-version gcc-4.8))
                       (symlink "libgcc.a" "libgcc_eh.a"))))
                 ,phases))))))
 
@@ -732,7 +732,7 @@ identifier SYSTEM."
 
      ;; No need for Texinfo at this stage.
      (native-inputs (alist-delete "texinfo"
-                                  (package-native-inputs gcc-4.7))))))
+                                  (package-native-inputs gcc-4.8))))))
 
 (define (linux-libre-headers-boot0)
   "Return Linux-Libre header files for the bootstrap environment."
@@ -798,7 +798,7 @@ identifier SYSTEM."
 (define (cross-gcc-wrapper gcc binutils glibc bash)
   "Return a wrapper for the pseudo-cross toolchain GCC/BINUTILS/GLIBC
 that makes it available under the native tool names."
-  (package (inherit gcc-4.7)
+  (package (inherit gcc-4.8)
     (name (string-append (package-name gcc) "-wrapped"))
     (source #f)
     (build-system trivial-build-system)
@@ -904,7 +904,7 @@ exec ~a/bin/~a-gcc -B~a/lib -Wl,-dynamic-linker -Wl,~a/~a \"$@\"~%"
        ;; doesn't honor $LIBRARY_PATH, which breaks `gnu-build-system'.)
        ,@(substitute-keyword-arguments (package-arguments gcc-boot0)
            ((#:configure-flags boot-flags)
-            (let loop ((args (package-arguments gcc-4.7)))
+            (let loop ((args (package-arguments gcc-4.8)))
               (match args
                 ((#:configure-flags normal-flags _ ...)
                  normal-flags)

gnu/packages/cross-base.scm

@@ -70,11 +70,11 @@
   "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."
-  (package (inherit gcc-4.7)
+  (package (inherit gcc-4.8)
     (name (string-append "gcc-cross-"
                          (if libc "" "sans-libc-")
                          target))
-    (source (origin (inherit (package-source gcc-4.7))
+    (source (origin (inherit (package-source gcc-4.8))
               (patches
                (list (search-patch "gcc-cross-environment-variables.patch")))))
     (arguments
@@ -85,7 +85,7 @@ GCC that does not target a libc; otherwise, target that libc."
                   (srfi srfi-1)
                   (srfi srfi-26))
 
-       ,@(substitute-keyword-arguments (package-arguments gcc-4.7)
+       ,@(substitute-keyword-arguments (package-arguments gcc-4.8)
            ((#:configure-flags flags)
             `(append (list ,(string-append "--target=" target)
                            ,@(gcc-configure-flags-for-triplet target)
@@ -186,7 +186,7 @@ GCC that does not target a libc; otherwise, target that libc."
        ("libc-native" ,@(assoc-ref %final-inputs "libc"))
 
        ;; Remaining inputs.
-       ,@(let ((inputs (append (package-inputs gcc-4.7)
+       ,@(let ((inputs (append (package-inputs gcc-4.8)
                                (alist-delete "libc" %final-inputs))))
            (if libc
                `(("libc" ,libc)

gnu/packages/make-bootstrap.scm

@@ -94,10 +94,10 @@ for `sh' in $PATH, and without nscd, and with static NSS modules."
             ("cross-binutils" ,(cross-binutils target))
             ,@%final-inputs))
         `(("libc" ,(glibc-for-bootstrap))
-          ("gcc" ,(package (inherit gcc-4.7)
+          ("gcc" ,(package (inherit gcc-4.8)
                     (inputs
                      `(("libc",(glibc-for-bootstrap))
-                       ,@(package-inputs gcc-4.7)))))
+                       ,@(package-inputs gcc-4.8)))))
           ,@(fold alist-delete %final-inputs '("libc" "gcc")))))
 
   (package-with-explicit-inputs p inputs
@@ -378,7 +378,7 @@ for `sh' in $PATH, and without nscd, and with static NSS modules."
 (define %gcc-static
   ;; A statically-linked GCC, with stripped-down functionality.
   (package-with-relocatable-glibc
-   (package (inherit gcc-4.7)
+   (package (inherit gcc-4.8)
      (name "gcc-static")
      (arguments
       `(#:modules ((guix build utils)
@@ -386,7 +386,7 @@ for `sh' in $PATH, and without nscd, and with static NSS modules."
                    (srfi srfi-1)
                    (srfi srfi-26)
                    (ice-9 regex))
-        ,@(substitute-keyword-arguments (package-arguments gcc-4.7)
+        ,@(substitute-keyword-arguments (package-arguments gcc-4.8)
             ((#:guile _) #f)
             ((#:implicit-inputs? _) #t)
             ((#:configure-flags flags)
@@ -409,11 +409,11 @@ for `sh' in $PATH, and without nscd, and with static NSS modules."
                ("mpfr-source" ,(package-source mpfr))
                ("mpc-source" ,(package-source mpc))
                ("binutils" ,binutils)
-               ,@(package-inputs gcc-4.7))))))
+               ,@(package-inputs gcc-4.8))))))
 
 (define %gcc-stripped
   ;; The subset of GCC files needed for bootstrap.
-  (package (inherit gcc-4.7)
+  (package (inherit gcc-4.8)
     (name "gcc-stripped")
     (build-system trivial-build-system)
     (source #f)