[tools] Add sdk_cfg.json setting for env CC detection

tools/building.py

@@ -210,15 +210,16 @@ def PrepareBuilding(env, root_directory, has_libcpu=False, remove_components = [
             envm = utils.ImportModule('env_utility')
             # from env import GetSDKPath
             exec_path = envm.GetSDKPath(rtconfig.CC)
-            if 'gcc' in rtconfig.CC:
-                exec_path = os.path.join(exec_path, 'bin')
-
-            if os.path.exists(exec_path):
-                Env['log'].debug('set CC to ' + exec_path)
-                rtconfig.EXEC_PATH = exec_path
-                os.environ['RTT_EXEC_PATH'] = exec_path
-            else:
-                Env['log'].debug('No Toolchain found in path(%s).' % exec_path)
+            if exec_path != None:
+                if 'gcc' in rtconfig.CC:
+                    exec_path = os.path.join(exec_path, 'bin')
+
+                if os.path.exists(exec_path):
+                    Env['log'].debug('set CC to ' + exec_path)
+                    rtconfig.EXEC_PATH = exec_path
+                    os.environ['RTT_EXEC_PATH'] = exec_path
+                else:
+                    Env['log'].debug('No Toolchain found in path(%s).' % exec_path)
         except Exception as e:
             # detect failed, ignore
             Env['log'].debug(e)

tools/env_utility.py

@@ -55,6 +55,15 @@ def GetSDKPath(name):
     sdk_pkgs = GetSDKPackagePath()
 
     if sdk_pkgs:
+        # read env/tools/scripts/sdk_cfg.json for curstomized SDK path
+        if os.path.exists(os.path.join(sdk_pkgs, '..', 'sdk_cfg.json')):
+            with open(os.path.join(sdk_pkgs, '..', 'sdk_cfg.json'), 'r', encoding='utf-8') as f:
+                sdk_cfg = json.load(f)
+                for item in sdk_cfg:
+                    if item['name'] == name:
+                        sdk = os.path.join(sdk_pkgs, item['path'])
+                        return sdk
+
         # read packages.json under env/tools/scripts/packages
         with open(os.path.join(sdk_pkgs, 'pkgs.json'), 'r', encoding='utf-8') as f:
             # packages_json = f.read()
@@ -68,7 +77,8 @@ def GetSDKPath(name):
                     package = json.load(f)
 
                     if package['name'] == name:
-                        return os.path.join(sdk_pkgs, package['name'] + '-' + item['ver'])
+                        sdk = os.path.join(sdk_pkgs, package['name'] + '-' + item['ver'])
+                        return sdk
 
     # not found named package
     return None