Make the bootstrap-tools test use the real unpacking derivation.

pkgs/stdenv/linux/default.nix

@@ -7,12 +7,14 @@
 # The function defaults are for easy testing.
 { system ? builtins.currentSystem
 , allPackages ? import ../../top-level/all-packages.nix
-, platform ? null, config ? {}, lib ? (import ../../../lib) }:
+, platform ? null, config ? {}, lib ? (import ../../../lib)
+, customBootstrapFiles ? null }:
 
 rec {
 
   bootstrapFiles =
-    if system == "i686-linux" then import ./bootstrap/i686.nix
+    if customBootstrapFiles != null then customBootstrapFiles
+    else if system == "i686-linux" then import ./bootstrap/i686.nix
     else if system == "x86_64-linux" then import ./bootstrap/x86_64.nix
     else if system == "armv5tel-linux" then import ./bootstrap/armv5tel.nix
     else if system == "armv6l-linux" then import ./bootstrap/armv6l.nix
@@ -293,5 +295,53 @@ rec {
         attr acl paxctl zlib pcre;
     };
   };
+  
+  
+  testBootstrapTools = let
+    defaultPkgs = allPackages { inherit system platform; };
+  in derivation {
+    name = "test-bootstrap-tools";
+    inherit system;
+    builder = bootstrapFiles.busybox;
+    args = [ "ash" "-e" "-c" "eval \"$buildCommand\"" ];
 
+    buildCommand = ''
+      export PATH=${bootstrapTools}/bin
+      
+      ls -l
+      mkdir $out
+      mkdir $out/bin
+      sed --version
+      find --version
+      diff --version
+      patch --version
+      make --version
+      awk --version
+      grep --version
+      gcc --version
+      curl --version
+
+      ldlinux=$(echo ${bootstrapTools}/lib/ld-linux*.so.?)
+      export CPP="cpp -idirafter ${bootstrapTools}/include-glibc -B${bootstrapTools}"
+      export CC="gcc -idirafter ${bootstrapTools}/include-glibc -B${bootstrapTools} -Wl,-dynamic-linker,$ldlinux -Wl,-rpath,${bootstrapTools}/lib"
+      export CXX="g++ -idirafter ${bootstrapTools}/include-glibc -B${bootstrapTools} -Wl,-dynamic-linker,$ldlinux -Wl,-rpath,${bootstrapTools}/lib"
+
+      echo '#include <stdio.h>' >> foo.c
+      echo '#include <limits.h>' >> foo.c
+      echo 'int main() { printf("Hello World\\n"); return 0; }' >> foo.c
+      $CC -o $out/bin/foo foo.c
+      $out/bin/foo
+
+      echo '#include <iostream>' >> bar.cc
+      echo 'int main() { std::cout << "Hello World\\n"; }' >> bar.cc
+      $CXX -v -o $out/bin/bar bar.cc
+      $out/bin/bar
+
+      tar xvf ${defaultPkgs.hello.src}
+      cd hello-*
+      ./configure --prefix=$out
+      make
+      make install
+    '';
+  };
 }