Merge remote-tracking branch 'upstream/master' into staging

That way the tarball job succeeds

pkgs/stdenv/darwin/default.nix

@@ -78,7 +78,6 @@ in rec {
         cc = if isNull last then "/dev/null" else import ../../build-support/cc-wrapper {
           inherit shell;
           inherit (last) stdenv;
-          inherit (last.pkgs.darwin) dyld;
 
           nativeTools  = true;
           nativePrefix = bootstrapTools;
@@ -86,8 +85,6 @@ in rec {
           buildPackages = lib.optionalAttrs (last ? stdenv) {
             inherit (last) stdenv;
           };
-          hostPlatform = localSystem;
-          targetPlatform = localSystem;
           libc         = last.pkgs.darwin.Libsystem;
           isClang      = true;
           cc           = { name = "clang-9.9.9"; outPath = bootstrapTools; };
@@ -320,10 +317,7 @@ in rec {
       buildPackages = {
         inherit (prevStage) stdenv;
       };
-      hostPlatform = localSystem;
-      targetPlatform = localSystem;
       inherit (pkgs) coreutils binutils gnugrep;
-      inherit (pkgs.darwin) dyld;
       cc   = pkgs.llvmPackages.clang-unwrapped;
       libc = pkgs.darwin.Libsystem;
     };

pkgs/stdenv/freebsd/default.nix

@@ -40,8 +40,6 @@ let inherit (localSystem) system; in
       targetPlatform = localSystem;
       inherit config;
       initialPath = [ "/" "/usr" ];
-      hostPlatform = localSystem;
-      targetPlatform = localSystem;
       shell = "${bootstrapTools}/bin/bash";
       fetchurlBoot = null;
       cc = null;
@@ -55,13 +53,11 @@ let inherit (localSystem) system; in
 
     stdenv = import ../generic {
       name = "stdenv-freebsd-boot-0";
-      buildPlatform = localSystem;
-      hostPlatform = localSystem;
-      targetPlatform = localSystem;
       inherit config;
       initialPath = [ prevStage.bootstrapTools ];
       inherit (prevStage.stdenv)
-        hostPlatform targetPlatform shell;
+        buildPlatform hostPlatform targetPlatform
+        shell;
       fetchurlBoot = prevStage.fetchurl;
       cc = null;
     };
@@ -71,13 +67,11 @@ let inherit (localSystem) system; in
     inherit config overlays;
     stdenv = import ../generic {
       name = "stdenv-freebsd-boot-3";
-      buildPlatform = localSystem;
-      hostPlatform = localSystem;
-      targetPlatform = localSystem;
       inherit config;
 
       inherit (prevStage.stdenv)
-        hostPlatform targetPlatform initialPath shell fetchurlBoot;
+        buildPlatform hostPlatform targetPlatform
+        initialPath shell fetchurlBoot;
 
       cc = import ../../build-support/cc-wrapper {
         nativeTools  = true;

pkgs/stdenv/linux/default.nix

@@ -79,8 +79,6 @@ let
           buildPackages = lib.optionalAttrs (prevStage ? stdenv) {
             inherit (prevStage) stdenv;
           };
-          hostPlatform = localSystem;
-          targetPlatform = localSystem;
           cc = prevStage.gcc-unwrapped;
           isGNU = true;
           libc = prevStage.glibc;
@@ -244,8 +242,6 @@ in
         buildPackages = {
           inherit (prevStage) stdenv;
         };
-        hostPlatform = localSystem;
-        targetPlatform = localSystem;
         cc = prevStage.gcc-unwrapped;
         libc = self.glibc;
         inherit (self) stdenv binutils coreutils gnugrep;

pkgs/stdenv/nix/default.nix

@@ -13,12 +13,10 @@ bootStages ++ [
     inherit config overlays;
 
     stdenv = import ../generic rec {
-      buildPlatform = localSystem;
-      hostPlatform = localSystem;
-      targetPlatform = localSystem;
-
       inherit config;
 
+      inherit (prevStage.stdenv) buildPlatform hostPlatform targetPlatform;
+
       preHook = ''
         export NIX_ENFORCE_PURITY="''${NIX_ENFORCE_PURITY-1}"
         export NIX_ENFORCE_NO_NATIVE="''${NIX_ENFORCE_NO_NATIVE-1}"
@@ -27,8 +25,6 @@ bootStages ++ [
 
       initialPath = (import ../common-path.nix) { pkgs = prevStage; };
 
-      inherit (prevStage.stdenv) hostPlatform targetPlatform;
-
       cc = import ../../build-support/cc-wrapper {
         nativeTools = false;
         nativePrefix = stdenv.lib.optionalString hostPlatform.isSunOS "/usr";