gcc-4.8: fix build

Problems: building with gcc-6 now, and fallout after output changes #27424.

pkgs/development/compilers/gcc/4.8/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, noSysDirs
+{ stdenv, fetchurl, fetchpatch, noSysDirs
 , langC ? true, langCC ? true, langFortran ? false
 , langObjC ? targetPlatform.isDarwin
 , langObjCpp ? targetPlatform.isDarwin
@@ -71,7 +71,14 @@ let version = "4.8.5";
       # target libraries and tools.
       ++ optional langAda ../gnat-cflags.patch
       ++ optional langFortran ../gfortran-driving.patch
-      ++ optional hostPlatform.isDarwin ../gfortran-darwin-NXConstStr.patch;
+      ++ optional hostPlatform.isDarwin ../gfortran-darwin-NXConstStr.patch
+      ++ [(fetchpatch {
+          name = "libc_name_p.diff"; # needed to build with gcc6
+          url = "https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff_plain;h=ec1cc0263f1";
+          sha256 = "01jd7pdarh54ki498g6sz64ijl9a1l5f9v8q2696aaxalvh2vwzl";
+          excludes = [ "gcc/cp/ChangeLog" ];
+        })]
+      ;
 
     javaEcj = fetchurl {
       # The `$(top_srcdir)/ecj.jar' file is automatically picked up at
@@ -218,7 +225,7 @@ stdenv.mkDerivation ({
 
   hardeningDisable = [ "format" ];
 
-  outputs = [ "out" "lib" "doc" ];
+  outputs = [ "out" "lib" "man" "info" ];
   setOutputFlags = false;
   NIX_NO_SELF_RPATH = true;