wrapCC, wrapBintools: don't alias stdenvNoCC to stdenv

In delicate code like this, it seems unwise to pass something of as
something it isn't for convenience's (?) sake. It causes a slight
possibility for confusion with `buildPackages.stdenv`. However, it
should be possible to eliminate the need for this in a separate change.

pkgs/build-support/bintools-wrapper/default.nix

@@ -83,8 +83,7 @@ let
     replaceStrings
     ;
 
-  stdenv = stdenvNoCC;
-  inherit (stdenv) hostPlatform targetPlatform;
+  inherit (stdenvNoCC) hostPlatform targetPlatform;
 
   # Prefix for binaries. Customarily ends with a dash separator.
   #
@@ -138,7 +137,7 @@ let
 
 in
 
-stdenv.mkDerivation {
+stdenvNoCC.mkDerivation {
   pname = targetPrefix
     + (if name != "" then name else "${bintoolsName}-wrapper");
   version = optionalString (bintools != null) bintoolsVersion;
@@ -346,7 +345,7 @@ stdenv.mkDerivation {
       done
     ''
 
-    + optionalString stdenv.targetPlatform.isDarwin ''
+    + optionalString stdenvNoCC.targetPlatform.isDarwin ''
       echo "-arch ${targetPlatform.darwinArch}" >> $out/nix-support/libc-ldflags
     ''
 
@@ -363,7 +362,7 @@ stdenv.mkDerivation {
     ###
     ### Remove certain timestamps from final binaries
     ###
-    + optionalString (stdenv.targetPlatform.isDarwin && !(bintools.isGNU or false)) ''
+    + optionalString (stdenvNoCC.targetPlatform.isDarwin && !(bintools.isGNU or false)) ''
       echo "export ZERO_AR_DATE=1" >> $out/nix-support/setup-hook
     ''
 
@@ -380,9 +379,9 @@ stdenv.mkDerivation {
     ###
     ### Ensure consistent LC_VERSION_MIN_MACOSX
     ###
-    + optionalString stdenv.targetPlatform.isDarwin (
+    + optionalString stdenvNoCC.targetPlatform.isDarwin (
       let
-        inherit (stdenv.targetPlatform)
+        inherit (stdenvNoCC.targetPlatform)
           darwinPlatform darwinSdkVersion
           darwinMinVersion darwinMinVersionVariable;
       in ''

pkgs/build-support/cc-wrapper/default.nix

@@ -82,9 +82,7 @@ let
     versionAtLeast
     ;
 
-  inherit (stdenv) hostPlatform targetPlatform;
-
-  stdenv = stdenvNoCC;
+  inherit (stdenvNoCC) hostPlatform targetPlatform;
 
   includeFortifyHeaders' = if includeFortifyHeaders != null
     then includeFortifyHeaders
@@ -119,10 +117,10 @@ let
 
   useGccForLibs = useCcForLibs
     && libcxx == null
-    && !stdenv.targetPlatform.isDarwin
-    && !(stdenv.targetPlatform.useLLVM or false)
-    && !(stdenv.targetPlatform.useAndroidPrebuilt or false)
-    && !(stdenv.targetPlatform.isiOS or false)
+    && !stdenvNoCC.targetPlatform.isDarwin
+    && !(stdenvNoCC.targetPlatform.useLLVM or false)
+    && !(stdenvNoCC.targetPlatform.useAndroidPrebuilt or false)
+    && !(stdenvNoCC.targetPlatform.isiOS or false)
     && gccForLibs != null;
   gccForLibs_solib = getLib gccForLibs
     + optionalString (targetPlatform != hostPlatform) "/${targetPlatform.config}";
@@ -249,17 +247,17 @@ let
     then cc.hardeningUnsupportedFlagsByTargetPlatform targetPlatform
     else (cc.hardeningUnsupportedFlags or []);
 
-  darwinPlatformForCC = optionalString stdenv.targetPlatform.isDarwin (
+  darwinPlatformForCC = optionalString stdenvNoCC.targetPlatform.isDarwin (
     if (targetPlatform.darwinPlatform == "macos" && isGNU) then "macosx"
     else targetPlatform.darwinPlatform
   );
 
-  darwinMinVersion = optionalString stdenv.targetPlatform.isDarwin (
-    stdenv.targetPlatform.darwinMinVersion
+  darwinMinVersion = optionalString stdenvNoCC.targetPlatform.isDarwin (
+    stdenvNoCC.targetPlatform.darwinMinVersion
   );
 
-  darwinMinVersionVariable = optionalString stdenv.targetPlatform.isDarwin
-    stdenv.targetPlatform.darwinMinVersionVariable;
+  darwinMinVersionVariable = optionalString stdenvNoCC.targetPlatform.isDarwin
+    stdenvNoCC.targetPlatform.darwinMinVersionVariable;
 in
 
 assert includeFortifyHeaders' -> fortify-headers != null;
@@ -272,7 +270,7 @@ assert nativeTools == bintools.nativeTools;
 assert nativeLibc == bintools.nativeLibc;
 assert nativePrefix == bintools.nativePrefix;
 
-stdenv.mkDerivation {
+stdenvNoCC.mkDerivation {
   pname = targetPrefix
     + (if name != "" then name else "${ccName}-wrapper");
   version = optionalString (cc != null) ccVersion;
@@ -426,7 +424,7 @@ stdenv.mkDerivation {
     ../setup-hooks/role.bash
   ] ++ optional (cc.langC or true) ./setup-hook.sh
     ++ optional (cc.langFortran or false) ./fortran-hook.sh
-    ++ optional (targetPlatform.isWindows) (stdenv.mkDerivation {
+    ++ optional (targetPlatform.isWindows) (stdenvNoCC.mkDerivation {
       name = "win-dll-hook.sh";
       dontUnpack = true;
       installPhase = ''
@@ -479,8 +477,8 @@ stdenv.mkDerivation {
     # break `useLLVM` into.)
     + optionalString (isClang
                       && targetPlatform.isLinux
-                      && !(stdenv.targetPlatform.useAndroidPrebuilt or false)
-                      && !(stdenv.targetPlatform.useLLVM or false)
+                      && !(stdenvNoCC.targetPlatform.useAndroidPrebuilt or false)
+                      && !(stdenvNoCC.targetPlatform.useLLVM or false)
                       && gccForLibs != null) (''
       echo "--gcc-toolchain=${gccForLibs}" >> $out/nix-support/cc-cflags
 
@@ -689,7 +687,7 @@ stdenv.mkDerivation {
       done
     ''
 
-    + optionalString stdenv.targetPlatform.isDarwin ''
+    + optionalString stdenvNoCC.targetPlatform.isDarwin ''
         echo "-arch ${targetPlatform.darwinArch}" >> $out/nix-support/cc-cflags
     ''