get rtt_root from bsp kconfig file

cmds/cmd_menuconfig.py

@@ -35,6 +35,20 @@ def build_kconfig_frontends(rtt_root):
     kconfig_dir = os.path.join(rtt_root, 'tools', 'kconfig-frontends')
     os.system('scons -C ' + kconfig_dir)
 
+def get_rtt_root():
+    rtt_root = os.getenv("RTT_ROOT")
+    if rtt_root is None:
+        bsp_root = Import("bsp_root")
+        with open(os.path.join(bsp_root, 'Kconfig')) as kconfig:
+            lines = kconfig.readlines()
+        for i in range(len(lines)):
+            if "config RTT_DIR" in lines[i]:
+                break
+        rtt_root = lines[i + 3].strip().split(" ")[1].strip('"')
+        if not os.path.isabs(rtt_root):
+            rtt_root = os.path.join(bsp_root, rtt_root)
+    return rtt_root
+
 def is_pkg_special_config(config_str):
     """judge if it's CONFIG_PKG_XX_PATH or CONFIG_PKG_XX_VER"""
 
@@ -139,7 +153,6 @@ def mk_rtconfig(filename):
 def cmd(args):
     env_root = Import('env_root')
     os.environ['PKGS_ROOT'] = Import("pkgs_root")
-    rtt_root = Import('rtt_root')
     if platform.system() == "Windows":
         os_version = platform.platform(True).split('-')[2][:3]
     kconfig_win7_path = os.path.join(
@@ -161,6 +174,9 @@ def cmd(args):
 
         return False
 
+    if platform.system() != "Windows":
+        rtt_root = get_rtt_root()
+
     fn = '.config'
 
     if os.path.isfile(fn):

env.py

@@ -100,24 +100,15 @@ def get_bsp_root():
 
     return bsp_root
 
-def get_rtt_root(bsp_root):
-    rtt_root = os.getenv("RTT_ROOT")
-    if rtt_root is None:
-        rtt_root = os.path.join(bsp_root, '..', '..')
-    return rtt_root
-
-
 def export_environment_variable():
     script_root = os.path.split(os.path.realpath(__file__))[0]
     sys.path = sys.path + [os.path.join(script_root)]
     bsp_root = get_bsp_root()
-    rtt_root = get_rtt_root(bsp_root)
     env_root = get_env_root()
     pkgs_root = get_package_root(env_root)
 
     Export('env_root')
     Export('bsp_root')
-    Export('rtt_root')
     Export('pkgs_root')