Use general hardening flag toggle lists

The following parameters are now available:

  * hardeningDisable
    To disable specific hardening flags
  * hardeningEnable
    To enable specific hardening flags

Only the cc-wrapper supports this right now, but these may be reused by
other wrappers, builders or setup hooks.

cc-wrapper supports the following flags:

  * fortify
  * stackprotector
  * pie (disabled by default)
  * pic
  * strictoverflow
  * format
  * relro
  * bindnow

pkgs/development/compilers/gcc/4.3/default.nix

@@ -95,8 +95,7 @@ stdenv.mkDerivation ({
     ++ (optionals langVhdl [gnat])
     ;
 
-  hardening_format = false;
-  hardening_stackprotector = false;
+  hardeningDisable = [ "format" "stackprotector" ];
 
   configureFlags = "
     ${if enableMultilib then "" else "--disable-multilib"}

pkgs/development/compilers/gcc/4.4/default.nix

@@ -103,7 +103,7 @@ stdenv.mkDerivation ({
     inherit langC langCC langFortran langJava langAda;
   };
 
-  hardening_format = false;
+  hardeningDisable = [ "format" ];
 
   patches =
     [ ./pass-cxxcpp.patch

pkgs/development/compilers/gcc/4.5/default.nix

@@ -134,8 +134,7 @@ stdenv.mkDerivation ({
     inherit langC langCC langFortran langJava langAda;
   };
 
-  hardening_format = false;
-  hardening_all = name != "gnat";
+  hardeningDisable = [ "format" ] ++ optional (name != "gnat") "all";
 
   patches =
     [ ]

pkgs/development/compilers/gcc/4.6/default.nix

@@ -189,7 +189,7 @@ stdenv.mkDerivation ({
 
   inherit patches enableMultilib;
 
-  hardening_format = false;
+  hardeningDisable = [ "format" ];
 
   postPatch =
     if (stdenv.isGNU

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

@@ -218,7 +218,7 @@ stdenv.mkDerivation ({
 
   inherit patches;
 
-  hardening_format = false;
+  hardeningDisable = [ "format" ];
 
   postPatch =
     if (stdenv.isGNU

pkgs/development/compilers/gcc/4.9/default.nix

@@ -220,9 +220,8 @@ stdenv.mkDerivation ({
 
   inherit patches;
 
-  # FIXME needs gcc 4.9 in bootstrap tools
-  hardening_stackprotector = false;
-  hardening_format = false;
+  # FIXME stackprotector needs gcc 4.9 in bootstrap tools
+  hardeningDisable = [ "format" "stackprotector" ];
 
   postPatch =
     if (stdenv.isGNU

pkgs/development/compilers/gcc/5/default.nix

@@ -216,7 +216,7 @@ stdenv.mkDerivation ({
     sha256 = "1ny4smkp5bzs3cp8ss7pl6lk8yss0d9m4av1mvdp72r1x695akxq";
   };
 
-  hardening_format = false;
+  hardeningDisable = [ "format" ];
 
   inherit patches;