Kernel is now in C++ :)

config.sh

@@ -7,6 +7,7 @@ export HOST=${HOST:-$(./default-host.sh)}
 export AR=${HOST}-ar
 export AS=${HOST}-as
 export CC=${HOST}-gcc
+export CXX=${HOST}-g++
  
 export PREFIX=/usr
 export EXEC_PREFIX=$PREFIX
@@ -20,9 +21,11 @@ export CPPFLAGS=''
 # Configure the cross-compiler to use the desired system root.
 export SYSROOT="$(pwd)/sysroot"
 export CC="$CC --sysroot=$SYSROOT"
+export CXX="$CXX --sysroot=$SYSROOT"
  
 # Work around that the -elf gcc targets doesn't have a system include directory
 # because it was configured with --without-headers rather than --with-sysroot.
 if echo "$HOST" | grep -Eq -- '-elf($|-)'; then
   export CC="$CC -isystem=$INCLUDEDIR"
+  export CXX="$CXX -isystem=$INCLUDEDIR"
 fi