diff --git a/tools/cmake.py b/tools/cmake.py
index 2c27c96a18..811b6693cb 100644
--- a/tools/cmake.py
+++ b/tools/cmake.py
@@ -17,7 +17,10 @@ def GenerateCFiles(env,project):
     info = utils.ProjectInfo(env)
 
     CC = os.path.join(rtconfig.EXEC_PATH, rtconfig.CC).replace('\\', "/")
-    CXX = os.path.join(rtconfig.EXEC_PATH, rtconfig.CXX).replace('\\', "/")
+    if 'CXX' in dir(rtconfig):
+        CXX = os.path.join(rtconfig.EXEC_PATH, rtconfig.CXX).replace('\\', "/")
+    else:
+        CXX = ''
     AS = os.path.join(rtconfig.EXEC_PATH, rtconfig.AS).replace('\\', "/")
     AR = os.path.join(rtconfig.EXEC_PATH, rtconfig.AR).replace('\\', "/")
     LINK = os.path.join(rtconfig.EXEC_PATH, rtconfig.LINK).replace('\\', "/")
@@ -28,9 +31,18 @@ def GenerateCFiles(env,project):
     elif rtconfig.CROSS_TOOL == 'keil':
         FROMELF = os.path.join(rtconfig.EXEC_PATH, 'fromelf').replace('\\', "/")
 
+    CFLAGS = rtconfig.CFLAGS.replace('\\', "/").replace('\"', "\\\"")
+    if 'CXXFLAGS' in dir(rtconfig):
+        CXXFLAGS = rtconfig.CXXFLAGS.replace('\\', "/").replace('\"', "\\\"")
+    else:
+        CXXFLAGS = CFLAGS
+    AFLAGS = rtconfig.AFLAGS.replace('\\', "/").replace('\"', "\\\"")
+    LFLAGS = rtconfig.LFLAGS.replace('\\', "/").replace('\"', "\\\"")
+
     if "win32" in sys.platform:
         CC += ".exe"
-        CXX += ".exe"
+        if CXX != '':
+            CXX += ".exe"
         AS += ".exe"
         AR += ".exe"
         LINK += ".exe"
@@ -41,7 +53,7 @@ def GenerateCFiles(env,project):
         elif rtconfig.CROSS_TOOL == 'keil':
             FROMELF += ".exe"
 
-    if not os.path.exists(CC) or not os.path.exists(CXX) or not os.path.exists(AS) or not os.path.exists(AR) or not os.path.exists(LINK):
+    if not os.path.exists(CC) or not os.path.exists(AS) or not os.path.exists(AR) or not os.path.exists(LINK):
         print("'Cannot found toolchain directory, please check RTT_CC and RTT_EXEC_PATH'")
         sys.exit(-1)
 
@@ -50,24 +62,25 @@ def GenerateCFiles(env,project):
         cm_file.write("CMAKE_MINIMUM_REQUIRED(VERSION 3.10)\n\n")
 
         cm_file.write("SET(CMAKE_SYSTEM_NAME Generic)\n")
-        cm_file.write("set(CMAKE_SYSTEM_PROCESSOR " + rtconfig.CPU +")\n")
+        cm_file.write("SET(CMAKE_SYSTEM_PROCESSOR " + rtconfig.CPU +")\n")
         cm_file.write("#SET(CMAKE_VERBOSE_MAKEFILE ON)\n\n")
 
         cm_file.write("SET(CMAKE_C_COMPILER \""+ CC + "\")\n")
-        cm_file.write("SET(CMAKE_CXX_COMPILER \""+ CXX + "\")\n")
         cm_file.write("SET(CMAKE_ASM_COMPILER \""+ AS + "\")\n")
-        cm_file.write("set(CMAKE_C_COMPILER_WORKS TRUE)\n")
-        cm_file.write("set(CMAKE_CXX_COMPILER_WORKS TRUE)\n\n")
+        cm_file.write("SET(CMAKE_C_FLAGS \""+ CFLAGS + "\")\n")
+        cm_file.write("SET(CMAKE_ASM_FLAGS \""+ AFLAGS + "\")\n")
+        cm_file.write("SET(CMAKE_C_COMPILER_WORKS TRUE)\n\n")
+
+        if CXX != '':
+            cm_file.write("SET(CMAKE_CXX_COMPILER \""+ CXX + "\")\n")
+            cm_file.write("SET(CMAKE_CXX_FLAGS \""+ CXXFLAGS + "\")\n")
+            cm_file.write("SET(CMAKE_CXX_COMPILER_WORKS TRUE)\n\n")
 
         if rtconfig.PLATFORM == 'gcc':
             cm_file.write("SET(CMAKE_OBJCOPY \""+ OBJCOPY + "\")\n")
             cm_file.write("SET(CMAKE_SIZE \""+ SIZE + "\")\n\n")
         elif rtconfig.CROSS_TOOL == 'keil':
-            cm_file.write("SET(CMAKE_FROMELF \""+ FROMELF + "\")\n")
-
-        cm_file.write("SET(CMAKE_C_FLAGS \""+ rtconfig.CFLAGS.replace('\\', "/").replace('\"', "\\\"") + "\")\n")
-        cm_file.write("SET(CMAKE_CXX_FLAGS \""+ rtconfig.CXXFLAGS.replace('\\', "/").replace('\"', "\\\"") + "\")\n")
-        cm_file.write("SET(CMAKE_ASM_FLAGS \""+ rtconfig.AFLAGS.replace('\\', "/").replace('\"', "\\\"") + "\")\n")
+            cm_file.write("SET(CMAKE_FROMELF \""+ FROMELF + "\")\n\n")
 
         LINKER_FLAGS = ''
         LINKER_LIBS = ''
@@ -83,20 +96,22 @@ def GenerateCFiles(env,project):
                 if 'LIBS' in group.keys():
                     for f in group['LIBS']:
                         LINKER_LIBS += ' ' + f.replace("\\", "/") + '.lib'
-        cm_file.write("SET(CMAKE_EXE_LINKER_FLAGS \""+ re.sub(LINKER_FLAGS + '(\s*)', LINKER_FLAGS + ' ${CMAKE_SOURCE_DIR}/',rtconfig.LFLAGS.replace('\\', "/").replace('\"', "\\\"")) + LINKER_LIBS + "\")\n\n")
-        
-        cm_file.write("SET(CMAKE_CXX_STANDARD 14)\n")
-        cm_file.write("PROJECT(rtthread C CXX ASM)\n")
-                
+        cm_file.write("SET(CMAKE_EXE_LINKER_FLAGS \""+ re.sub(LINKER_FLAGS + '(\s*)', LINKER_FLAGS + ' ${CMAKE_SOURCE_DIR}/', LFLAGS) + LINKER_LIBS + "\")\n\n")
+
+        if CXX != '':
+            cm_file.write("SET(CMAKE_CXX_STANDARD 14)\n")
+            cm_file.write("PROJECT(rtthread C CXX ASM)\n")
+        else:
+            cm_file.write("PROJECT(rtthread C ASM)\n")
+
         cm_file.write("INCLUDE_DIRECTORIES(\n")
         for i in info['CPPPATH']:
-                cm_file.write( "\t" + i.replace("\\", "/") + "\n")
+            cm_file.write( "\t" + i.replace("\\", "/") + "\n")
         cm_file.write(")\n\n")
 
-
         cm_file.write("ADD_DEFINITIONS(\n")
         for i in info['CPPDEFINES']:
-                cm_file.write("\t-D" + i + "\n")
+            cm_file.write("\t-D" + i + "\n")
         cm_file.write(")\n\n")
 
         cm_file.write("SET(PROJECT_SOURCES\n")
@@ -104,7 +119,7 @@ def GenerateCFiles(env,project):
             for f in group['src']:
                 cm_file.write( "\t" + os.path.normpath(f.rfile().abspath).replace("\\", "/") + "\n" )
         cm_file.write(")\n\n")
-        
+
         if rtconfig.PLATFORM == 'gcc':
             cm_file.write("LINK_DIRECTORIES(\n")
             for group in project: