simulator: add clang-analyze tool support

When CROSS_TOOL or 'RTT_CC' env is setted to 'clang-analyze', it will
use Clang to check the codes.

bsp/simulator/SConstruct

@@ -73,6 +73,10 @@ elif rtconfig.PLATFORM == 'mingw':
         LINK = rtconfig.LINK, LINKFLAGS = rtconfig.LFLAGS)
     env['LIBS']=libs
     env.PrependENVPath('PATH', rtconfig.EXEC_PATH)
+elif rtconfig.CROSS_TOOL == 'clang-analyze':
+    TARGET = 'rtthread'
+    env = Environment(toolpath=[os.path.join(RTT_ROOT, 'tools', 'tools')],
+                      tools = [rtconfig.CROSS_TOOL])
 else:
     TARGET = 'rtthread'
     env['CC']=rtconfig.CC

bsp/simulator/rtconfig.py

@@ -12,10 +12,10 @@ if os.getenv('RTT_CC'):
 
 # cross_tool provides the cross compiler
 # EXEC_PATH is the compiler execute path 
-if  CROSS_TOOL == 'gcc':
+if  CROSS_TOOL == 'gcc' or CROSS_TOOL == 'clang-analyze':
     CPU       = 'posix'
     PLATFORM  = 'gcc'
-    EXEC_PATH = '/usr/bin/gcc'
+    EXEC_PATH = ''
 
 elif  CROSS_TOOL == 'mingw':
     CPU       = 'win32'
@@ -26,8 +26,7 @@ elif  CROSS_TOOL == 'msvc':
     CPU       = 'win32'
     PLATFORM  = 'cl'
     EXEC_PATH = ''
-
-else :
+else:
     print "bad CROSS TOOL!"
     exit(1)