fix GNU GCC path issue in building script.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1953 bbd45198-f89e-11dd-88c7-29a3b14d5316

tools/building.py

@@ -436,17 +436,21 @@ class Win32Spawn:
         cmdline = cmd + " " + newargs
         startupinfo = subprocess.STARTUPINFO()
         startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
+        penv = {}
+        for key, value in env.iteritems():
+            penv[key] = str(value)
+
         proc = subprocess.Popen(cmdline, stdin=subprocess.PIPE, stdout=subprocess.PIPE,
-            stderr=subprocess.PIPE, startupinfo=startupinfo, shell = False)
+            stderr=subprocess.PIPE, startupinfo=startupinfo, shell = False, env=penv)
         data, err = proc.communicate()
         rv = proc.wait()
+        if data:
+            print data
         if err:
             print err
+
         if rv:
             return rv
-
-        if data:
-            print data
         return 0
 
 def PrepareBuilding(env, root_directory, has_libcpu=False):