diff --git a/.github/workflows/action.yml b/.github/workflows/action.yml
index 4d999cbc20..2608af5399 100644
--- a/.github/workflows/action.yml
+++ b/.github/workflows/action.yml
@@ -44,7 +44,6 @@ jobs:
                 - "asm9260t"
                 - "allwinner_tina"
                 - "ft32/ft32f072xb-starter"
-                - "tkm32F499"
                 - "mini2440"
                 - "mm32/mm32f3270-100ask-pitaya"
                 - "sam7x"   
diff --git a/components/libc/Kconfig b/components/libc/Kconfig
index 3cdaba4bcf..ea6763007e 100644
--- a/components/libc/Kconfig
+++ b/components/libc/Kconfig
@@ -1,5 +1,8 @@
 menu "C/C++ and POSIX layer"
 
+config RT_USING_EXTERNAL_LIBC
+    bool
+
 config RT_LIBC_DEFAULT_TIMEZONE
     int "Set the default time zone (UTC+)"
     range -12 12
diff --git a/components/libc/compilers/musl/SConscript b/components/libc/compilers/musl/SConscript
index 9bc5696157..8c5d0448ae 100644
--- a/components/libc/compilers/musl/SConscript
+++ b/components/libc/compilers/musl/SConscript
@@ -5,10 +5,10 @@ Import('rtconfig')
 
 group = []
 
-libc_name, libc_version = GetGCCLibcNameVersion(rtconfig)
+musllibc_version = GetMuslVersion(rtconfig)
 
-if libc_name == 'musl':
-    print('Musl version: ' + libc_version)
+if musllibc_version:
+    print('Musl version: ' + musllibc_version)
 
     cwd = GetCurrentDir()
     src = Glob('*.c')
diff --git a/components/libc/compilers/newlib/SConscript b/components/libc/compilers/newlib/SConscript
index 14d3f737f5..518fee8775 100644
--- a/components/libc/compilers/newlib/SConscript
+++ b/components/libc/compilers/newlib/SConscript
@@ -5,10 +5,10 @@ Import('rtconfig')
 
 group = []
 
-libc_name, libc_version = GetGCCLibcNameVersion(rtconfig)
+newlib_version = GetNewLibVersion(rtconfig)
 
-if libc_name == 'newlib':
-    print('Newlib version: ' + libc_version)
+if newlib_version and not GetDepend('RT_USING_EXTERNAL_LIBC'):
+    print('Newlib version: ' + newlib_version)
 
     cwd = GetCurrentDir()
     src = Glob('*.c')
diff --git a/tools/gcc.py b/tools/gcc.py
index 905845f825..c82a1e9271 100644
--- a/tools/gcc.py
+++ b/tools/gcc.py
@@ -67,7 +67,7 @@ def CheckHeader(rtconfig, filename):
     return False
 
 def GetNewLibVersion(rtconfig):
-    version = 'unknown'
+    version = None
     root = GetGCCRoot(rtconfig)
     if CheckHeader(rtconfig, '_newlib_version.h'): # get version from _newlib_version.h file
         f = open(os.path.join(root, 'include', '_newlib_version.h'), 'r')
@@ -85,33 +85,13 @@ def GetNewLibVersion(rtconfig):
             f.close()
     return version
 
-# FIXME: it's not very good
-def CheckMUSLLibc(rtconfig):
-    if 'musl' in rtconfig.PREFIX:
-        return True
-    return False
-
 # FIXME: there is no musl version or musl macros can be found officially
 def GetMuslVersion(rtconfig):
-    version = 'unknown'
-    # root = GetGCCRoot(rtconfig)
-    # print(root)
+    version = None
+    if 'musl' in rtconfig.PREFIX:
+        version = 'unknown'
     return version
 
-# return libc name and version
-def GetGCCLibcNameVersion(rtconfig):
-    if rtconfig.PLATFORM != 'gcc':
-        return ('unknown', 'unknown')
-
-    newlib_version = GetNewLibVersion(rtconfig)
-    if newlib_version != 'unknown':
-        return ('newlib', newlib_version) # libc: newlib, version: newlib_version
-    elif CheckMUSLLibc(rtconfig) == True:
-        GetMuslVersion(rtconfig)
-        return ('musl', 'unknown') #libc: musl, version: unknown
-    else:
-        return ('unknown', 'unknown') # libc: unknown, version: unknown
-
 def GCCResult(rtconfig, str):
     import subprocess