diff --git a/bsp/CME_M7/SConstruct b/bsp/CME_M7/SConstruct
index 4d5dfc1d4d..0f0407128d 100644
--- a/bsp/CME_M7/SConstruct
+++ b/bsp/CME_M7/SConstruct
@@ -8,6 +8,7 @@ from building import *
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/allwinner_tina/SConstruct b/bsp/allwinner_tina/SConstruct
index f0c508ba6d..9a1fa924e1 100644
--- a/bsp/allwinner_tina/SConstruct
+++ b/bsp/allwinner_tina/SConstruct
@@ -9,6 +9,7 @@ from building import *
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/amebaz/SConstruct b/bsp/amebaz/SConstruct
index 713fe15443..ac79195833 100644
--- a/bsp/amebaz/SConstruct
+++ b/bsp/amebaz/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/apollo2/SConstruct b/bsp/apollo2/SConstruct
index 1f57277560..1cbda577ee 100644
--- a/bsp/apollo2/SConstruct
+++ b/bsp/apollo2/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread_apollo2.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/asm9260t/SConstruct b/bsp/asm9260t/SConstruct
index 98b5712caf..eb7290cf6f 100644
--- a/bsp/asm9260t/SConstruct
+++ b/bsp/asm9260t/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/at91sam9260/SConstruct b/bsp/at91sam9260/SConstruct
index 7ce3af43b6..f91ca8c0a4 100755
--- a/bsp/at91sam9260/SConstruct
+++ b/bsp/at91sam9260/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread-at91sam9260.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/at91sam9g45/SConstruct b/bsp/at91sam9g45/SConstruct
index 41139a3377..66063a0bf7 100644
--- a/bsp/at91sam9g45/SConstruct
+++ b/bsp/at91sam9g45/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread-at91sam9g45.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/avr32uc3b0/SConstruct b/bsp/avr32uc3b0/SConstruct
index 834d66615f..20556cce2c 100644
--- a/bsp/avr32uc3b0/SConstruct
+++ b/bsp/avr32uc3b0/SConstruct
@@ -12,6 +12,7 @@ from building import *
  
 TARGET = 'rtthread-' + rtconfig.ARCH + '.' + rtconfig.TARGET_EXT
  
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
    AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
    CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/beaglebone/SConstruct b/bsp/beaglebone/SConstruct
index 6b19269c47..5a9b7e82ba 100644
--- a/bsp/beaglebone/SConstruct
+++ b/bsp/beaglebone/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread-beaglebone.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/ck802/SConstruct b/bsp/ck802/SConstruct
index 6c54a5b595..eeb3a3a236 100644
--- a/bsp/ck802/SConstruct
+++ b/bsp/ck802/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread-ck802.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/dm365/SConstruct b/bsp/dm365/SConstruct
index fc6cffa67c..edd5cba974 100644
--- a/bsp/dm365/SConstruct
+++ b/bsp/dm365/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread-dm365.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/efm32/SConstruct b/bsp/efm32/SConstruct
index 4849771bf0..3adbb60a52 100644
--- a/bsp/efm32/SConstruct
+++ b/bsp/efm32/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread-efm32.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/es32f0334/SConstruct b/bsp/es32f0334/SConstruct
index 713fe15443..ac79195833 100644
--- a/bsp/es32f0334/SConstruct
+++ b/bsp/es32f0334/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/es32f0654/SConstruct b/bsp/es32f0654/SConstruct
index 713fe15443..ac79195833 100644
--- a/bsp/es32f0654/SConstruct
+++ b/bsp/es32f0654/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/fh8620/SConstruct b/bsp/fh8620/SConstruct
index 7f9e572807..02528da49f 100644
--- a/bsp/fh8620/SConstruct
+++ b/bsp/fh8620/SConstruct
@@ -15,6 +15,7 @@ TARGET = rtconfig.OUTPUT_NAME + rtconfig.TARGET_EXT
 # add rtconfig.h path to the assembler
 rtconfig.AFLAGS += ' -I' + str(Dir('#')) +' -I' + RTT_ROOT + '/libcpu/arm/armv6'
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
         AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
         CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/frdm-k64f/SConstruct b/bsp/frdm-k64f/SConstruct
index eb4f3d8eac..4e87070d64 100644
--- a/bsp/frdm-k64f/SConstruct
+++ b/bsp/frdm-k64f/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread-k64f.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/gd32303e-eval/SConstruct b/bsp/gd32303e-eval/SConstruct
index 1cdbaab4a8..215861f94c 100644
--- a/bsp/gd32303e-eval/SConstruct
+++ b/bsp/gd32303e-eval/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rtthread-gd32f30x.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/gd32450z-eval/SConstruct b/bsp/gd32450z-eval/SConstruct
index adf9077eac..62726d6ee8 100644
--- a/bsp/gd32450z-eval/SConstruct
+++ b/bsp/gd32450z-eval/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rtthread-gd32f4xx.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/gd32e230k-start/SConstruct b/bsp/gd32e230k-start/SConstruct
index 57a8ac59fc..091f38e983 100644
--- a/bsp/gd32e230k-start/SConstruct
+++ b/bsp/gd32e230k-start/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rtthread-gd32f230.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/gd32vf103v-eval/SConstruct b/bsp/gd32vf103v-eval/SConstruct
index 3caac2f35d..33ab37287f 100644
--- a/bsp/gd32vf103v-eval/SConstruct
+++ b/bsp/gd32vf103v-eval/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/gkipc/SConstruct b/bsp/gkipc/SConstruct
index eebbcf3996..cc15e4b677 100644
--- a/bsp/gkipc/SConstruct
+++ b/bsp/gkipc/SConstruct
@@ -15,6 +15,7 @@ TARGET = rtconfig.OUTPUT_NAME + rtconfig.TARGET_EXT
 # add rtconfig.h path to the assembler
 rtconfig.AFLAGS += ' -I' + str(Dir('#')) +' -I' + str(Dir('#')) + '/bsp'
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
         AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
         CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/hifive1/SConstruct b/bsp/hifive1/SConstruct
index da359a3016..c3051306e4 100644
--- a/bsp/hifive1/SConstruct
+++ b/bsp/hifive1/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/imx6sx/cortex-a9/SConstruct b/bsp/imx6sx/cortex-a9/SConstruct
index c76066ac37..c92339130e 100644
--- a/bsp/imx6sx/cortex-a9/SConstruct
+++ b/bsp/imx6sx/cortex-a9/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread-imx6.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/imx6ul/SConstruct b/bsp/imx6ul/SConstruct
index eaf40ea2d8..9483ea927d 100644
--- a/bsp/imx6ul/SConstruct
+++ b/bsp/imx6ul/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread-imx6.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/imxrt/imxrt1052-atk-commander/SConstruct b/bsp/imxrt/imxrt1052-atk-commander/SConstruct
index 8d27d0e199..9e5cd55bc0 100644
--- a/bsp/imxrt/imxrt1052-atk-commander/SConstruct
+++ b/bsp/imxrt/imxrt1052-atk-commander/SConstruct
@@ -16,7 +16,7 @@ except:
     exit(-1)
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
-
+DefaultEnvironment(tools=[])
 if rtconfig.PLATFORM == 'armcc':
     env = Environment(tools = ['mingw'],
         AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
diff --git a/bsp/imxrt/imxrt1052-fire-pro/SConstruct b/bsp/imxrt/imxrt1052-fire-pro/SConstruct
index 8d27d0e199..9e5cd55bc0 100644
--- a/bsp/imxrt/imxrt1052-fire-pro/SConstruct
+++ b/bsp/imxrt/imxrt1052-fire-pro/SConstruct
@@ -16,7 +16,7 @@ except:
     exit(-1)
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
-
+DefaultEnvironment(tools=[])
 if rtconfig.PLATFORM == 'armcc':
     env = Environment(tools = ['mingw'],
         AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
diff --git a/bsp/imxrt/imxrt1052-nxp-evk/SConstruct b/bsp/imxrt/imxrt1052-nxp-evk/SConstruct
index 8d27d0e199..9e5cd55bc0 100644
--- a/bsp/imxrt/imxrt1052-nxp-evk/SConstruct
+++ b/bsp/imxrt/imxrt1052-nxp-evk/SConstruct
@@ -16,7 +16,7 @@ except:
     exit(-1)
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
-
+DefaultEnvironment(tools=[])
 if rtconfig.PLATFORM == 'armcc':
     env = Environment(tools = ['mingw'],
         AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
diff --git a/bsp/imxrt/imxrt1064-nxp-evk/SConstruct b/bsp/imxrt/imxrt1064-nxp-evk/SConstruct
index 15f504bd6c..71be0c13c6 100644
--- a/bsp/imxrt/imxrt1064-nxp-evk/SConstruct
+++ b/bsp/imxrt/imxrt1064-nxp-evk/SConstruct
@@ -16,7 +16,7 @@ except:
     exit(-1)
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
-
+DefaultEnvironment(tools=[])
 if rtconfig.PLATFORM == 'armcc':
     env = Environment(tools = ['mingw'],
         AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
diff --git a/bsp/imxrt/libraries/templates/imxrt1050xxx/SConstruct b/bsp/imxrt/libraries/templates/imxrt1050xxx/SConstruct
index 3ba89ccafe..b420dfedb2 100644
--- a/bsp/imxrt/libraries/templates/imxrt1050xxx/SConstruct
+++ b/bsp/imxrt/libraries/templates/imxrt1050xxx/SConstruct
@@ -16,7 +16,7 @@ except:
     exit(-1)
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
-
+DefaultEnvironment(tools=[])
 if rtconfig.PLATFORM == 'armcc':
     env = Environment(tools = ['mingw'],
         AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
diff --git a/bsp/imxrt/libraries/templates/imxrt1064xxx/SConstruct b/bsp/imxrt/libraries/templates/imxrt1064xxx/SConstruct
index 15f504bd6c..71be0c13c6 100644
--- a/bsp/imxrt/libraries/templates/imxrt1064xxx/SConstruct
+++ b/bsp/imxrt/libraries/templates/imxrt1064xxx/SConstruct
@@ -16,7 +16,7 @@ except:
     exit(-1)
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
-
+DefaultEnvironment(tools=[])
 if rtconfig.PLATFORM == 'armcc':
     env = Environment(tools = ['mingw'],
         AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
diff --git a/bsp/k210/SConstruct b/bsp/k210/SConstruct
index dc55b29194..20bae7eee9 100644
--- a/bsp/k210/SConstruct
+++ b/bsp/k210/SConstruct
@@ -9,6 +9,7 @@ from building import *
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/lm3s8962/SConstruct b/bsp/lm3s8962/SConstruct
index c829512b41..966e5b398f 100644
--- a/bsp/lm3s8962/SConstruct
+++ b/bsp/lm3s8962/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread-lm3s.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/lm3s9b9x/SConstruct b/bsp/lm3s9b9x/SConstruct
index 3542c5c40c..efa0d1ef96 100644
--- a/bsp/lm3s9b9x/SConstruct
+++ b/bsp/lm3s9b9x/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread-lm3s.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/lm4f232/SConstruct b/bsp/lm4f232/SConstruct
index 16877dd5b4..16bff0b3be 100644
--- a/bsp/lm4f232/SConstruct
+++ b/bsp/lm4f232/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/lpc1114/SConstruct b/bsp/lpc1114/SConstruct
index 3f3d509e2f..71da42a029 100644
--- a/bsp/lpc1114/SConstruct
+++ b/bsp/lpc1114/SConstruct
@@ -9,6 +9,7 @@ from building import *
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/lpc176x/SConstruct b/bsp/lpc176x/SConstruct
index 4afcf96602..7cce9135bb 100644
--- a/bsp/lpc176x/SConstruct
+++ b/bsp/lpc176x/SConstruct
@@ -11,6 +11,7 @@ from building import *
 
 TARGET = 'rtthread-lpc17xx.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/lpc178x/SConstruct b/bsp/lpc178x/SConstruct
index 8503d8053c..526de324cd 100644
--- a/bsp/lpc178x/SConstruct
+++ b/bsp/lpc178x/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread-lpc178x.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/lpc2148/SConstruct b/bsp/lpc2148/SConstruct
index e1d4c19aac..d5dc943c14 100644
--- a/bsp/lpc2148/SConstruct
+++ b/bsp/lpc2148/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'build/rtthread-lpc214x.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/lpc2478/SConstruct b/bsp/lpc2478/SConstruct
index b209a1a2ec..e57eb2752b 100644
--- a/bsp/lpc2478/SConstruct
+++ b/bsp/lpc2478/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread-lpc24xx.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/lpc408x/SConstruct b/bsp/lpc408x/SConstruct
index 22bb73b311..cd9f21156b 100644
--- a/bsp/lpc408x/SConstruct
+++ b/bsp/lpc408x/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/lpc43xx/M0/SConstruct b/bsp/lpc43xx/M0/SConstruct
index c0d1d2fdc0..3a52eb9a43 100644
--- a/bsp/lpc43xx/M0/SConstruct
+++ b/bsp/lpc43xx/M0/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread-lpc40xx.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/lpc43xx/M4/SConstruct b/bsp/lpc43xx/M4/SConstruct
index a6390025a3..bcdc7f03eb 100644
--- a/bsp/lpc43xx/M4/SConstruct
+++ b/bsp/lpc43xx/M4/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'build/rtthread_lpc43xx.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/lpc5410x/SConstruct b/bsp/lpc5410x/SConstruct
index fb728723bc..db26ec3568 100644
--- a/bsp/lpc5410x/SConstruct
+++ b/bsp/lpc5410x/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread-%s.%s' % (rtconfig.BOARD_NAME, rtconfig.TARGET_EXT)
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/lpc54114-lite/SConstruct b/bsp/lpc54114-lite/SConstruct
index aa0f6a15a3..d784bbb0c8 100644
--- a/bsp/lpc54114-lite/SConstruct
+++ b/bsp/lpc54114-lite/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread-%s.%s' % (rtconfig.BOARD_NAME, rtconfig.TARGET_EXT)
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/lpc54608-LPCXpresso/SConstruct b/bsp/lpc54608-LPCXpresso/SConstruct
index a2d74ca040..e821687fc1 100644
--- a/bsp/lpc54608-LPCXpresso/SConstruct
+++ b/bsp/lpc54608-LPCXpresso/SConstruct
@@ -11,7 +11,7 @@ sys.path = sys.path + [os.path.join(RTT_ROOT, 'tools')]
 from building import *
 
 TARGET = 'rtthread-%s.%s' % (rtconfig.BOARD_NAME, rtconfig.TARGET_EXT)
-
+DefaultEnvironment(tools=[])
 if rtconfig.PLATFORM == 'armcc':
     env = Environment(tools = ['mingw'],
         AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
diff --git a/bsp/lpc824/SConstruct b/bsp/lpc824/SConstruct
index a87696475d..13c205c1d2 100644
--- a/bsp/lpc824/SConstruct
+++ b/bsp/lpc824/SConstruct
@@ -14,6 +14,7 @@ from building import *
 
 TARGET = 'rtthread-lpc842.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/ls1bdev/SConstruct b/bsp/ls1bdev/SConstruct
index 17e1d15db3..cc52d5f22d 100644
--- a/bsp/ls1bdev/SConstruct
+++ b/bsp/ls1bdev/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/ls1cdev/SConstruct b/bsp/ls1cdev/SConstruct
index a2f2cae178..7006f4f2de 100644
--- a/bsp/ls1cdev/SConstruct
+++ b/bsp/ls1cdev/SConstruct
@@ -14,6 +14,7 @@ TARGET = 'rtthread.' + rtconfig.TARGET_EXT
 
 rtconfig.AFLAGS += ' -I' + str(Dir('#'))
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/m16c62p/SConstruct b/bsp/m16c62p/SConstruct
index 02b05a150c..8c5b7cd5e1 100644
--- a/bsp/m16c62p/SConstruct
+++ b/bsp/m16c62p/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtt2m16c.' + rtconfig.TARGET_EXT 
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/mb9bf500r/SConstruct b/bsp/mb9bf500r/SConstruct
index be2a125e2c..6c02b383f2 100644
--- a/bsp/mb9bf500r/SConstruct
+++ b/bsp/mb9bf500r/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/mb9bf506r/SConstruct b/bsp/mb9bf506r/SConstruct
index 5c060833f4..ab0b74817a 100644
--- a/bsp/mb9bf506r/SConstruct
+++ b/bsp/mb9bf506r/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/mb9bf568r/SConstruct b/bsp/mb9bf568r/SConstruct
index 2a092f5a7e..bb8ca26990 100644
--- a/bsp/mb9bf568r/SConstruct
+++ b/bsp/mb9bf568r/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread-fm4.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/mb9bf618s/SConstruct b/bsp/mb9bf618s/SConstruct
index 5c060833f4..ab0b74817a 100644
--- a/bsp/mb9bf618s/SConstruct
+++ b/bsp/mb9bf618s/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/mini2440/SConstruct b/bsp/mini2440/SConstruct
index 76e219bff3..a89673811c 100644
--- a/bsp/mini2440/SConstruct
+++ b/bsp/mini2440/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread-mini2440.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/mini4020/SConstruct b/bsp/mini4020/SConstruct
index c40ec891fa..81d08b0cdd 100644
--- a/bsp/mini4020/SConstruct
+++ b/bsp/mini4020/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread-mini4020.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/mm32l07x/SConstruct b/bsp/mm32l07x/SConstruct
index 44567aea78..8418d596c0 100644
--- a/bsp/mm32l07x/SConstruct
+++ b/bsp/mm32l07x/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/mm32l3xx/SConstruct b/bsp/mm32l3xx/SConstruct
index 44567aea78..8418d596c0 100644
--- a/bsp/mm32l3xx/SConstruct
+++ b/bsp/mm32l3xx/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/nrf51822/SConstruct b/bsp/nrf51822/SConstruct
index 5813f6442c..c46e9fb9e7 100644
--- a/bsp/nrf51822/SConstruct
+++ b/bsp/nrf51822/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread-stm32f0xx.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/nrf52832/SConstruct b/bsp/nrf52832/SConstruct
index 78a2f594b5..f093ad6de7 100644
--- a/bsp/nrf52832/SConstruct
+++ b/bsp/nrf52832/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread_nrf52832.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/nuvoton_m05x/SConstruct b/bsp/nuvoton_m05x/SConstruct
index 7fad129d8e..cdb079382a 100644
--- a/bsp/nuvoton_m05x/SConstruct
+++ b/bsp/nuvoton_m05x/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread-nuvotan_m05x.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/nuvoton_m451/SConstruct b/bsp/nuvoton_m451/SConstruct
index b7994463ee..28df409418 100644
--- a/bsp/nuvoton_m451/SConstruct
+++ b/bsp/nuvoton_m451/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread-nuvotan_m451.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/nuvoton_m487/SConstruct b/bsp/nuvoton_m487/SConstruct
index 28e4279763..c27699fbb7 100644
--- a/bsp/nuvoton_m487/SConstruct
+++ b/bsp/nuvoton_m487/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread-m487.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/nuvoton_nuc472/SConstruct b/bsp/nuvoton_nuc472/SConstruct
index 9257163aef..0c9b103d6e 100644
--- a/bsp/nuvoton_nuc472/SConstruct
+++ b/bsp/nuvoton_nuc472/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread-nuc472.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/nv32f100x/SConstruct b/bsp/nv32f100x/SConstruct
index 47ac06abf2..951c03f2d0 100644
--- a/bsp/nv32f100x/SConstruct
+++ b/bsp/nv32f100x/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread-nv32f100x.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/qemu-vexpress-a9/SConstruct b/bsp/qemu-vexpress-a9/SConstruct
index d618790dec..ddfe03da28 100644
--- a/bsp/qemu-vexpress-a9/SConstruct
+++ b/bsp/qemu-vexpress-a9/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS   = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC   = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/qemu-vexpress-gemini/SConstruct b/bsp/qemu-vexpress-gemini/SConstruct
index 765abd555a..140316ad06 100644
--- a/bsp/qemu-vexpress-gemini/SConstruct
+++ b/bsp/qemu-vexpress-gemini/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread-vexpress.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/raspi2/SConstruct b/bsp/raspi2/SConstruct
index 1326632477..e5acdb2554 100644
--- a/bsp/raspi2/SConstruct
+++ b/bsp/raspi2/SConstruct
@@ -9,6 +9,7 @@ from building import *
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/realview-a8/SConstruct b/bsp/realview-a8/SConstruct
index 0885dbfc0e..2ba0e9f457 100644
--- a/bsp/realview-a8/SConstruct
+++ b/bsp/realview-a8/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread-realview.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/rm48x50/SConstruct b/bsp/rm48x50/SConstruct
index 44e0a61ac7..1abf18b626 100644
--- a/bsp/rm48x50/SConstruct
+++ b/bsp/rm48x50/SConstruct
@@ -11,6 +11,7 @@ from building import *
 
 TARGET = 'rtthread-rm48x50.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/rv32m1_vega/ri5cy/SConstruct b/bsp/rv32m1_vega/ri5cy/SConstruct
index b314d10ce9..b902c7522a 100644
--- a/bsp/rv32m1_vega/ri5cy/SConstruct
+++ b/bsp/rv32m1_vega/ri5cy/SConstruct
@@ -9,6 +9,7 @@ from building import *
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/sam7x/SConstruct b/bsp/sam7x/SConstruct
index 83714f5ad8..c257fdcb39 100644
--- a/bsp/sam7x/SConstruct
+++ b/bsp/sam7x/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread-sam7x.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/samd21/SConstruct b/bsp/samd21/SConstruct
index 0773dea2fa..2fb8879b88 100644
--- a/bsp/samd21/SConstruct
+++ b/bsp/samd21/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'SAM_D2X_RTT.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/sep6200/SConstruct b/bsp/sep6200/SConstruct
index 7c6bc8e032..bd3b704767 100644
--- a/bsp/sep6200/SConstruct
+++ b/bsp/sep6200/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread-sep6200.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/simulator/SConstruct b/bsp/simulator/SConstruct
index 0298679528..6724841075 100755
--- a/bsp/simulator/SConstruct
+++ b/bsp/simulator/SConstruct
@@ -56,6 +56,7 @@ elif rtconfig.PLATFORM == 'mingw':
         odbccp32
         ''')
     TARGET = 'rtthread-win32.' + rtconfig.TARGET_EXT
+    DefaultEnvironment(tools=[])
     env = Environment(tools = ['mingw'],
         AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
         CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/libraries/templates/stm32f0xx/SConstruct b/bsp/stm32/libraries/templates/stm32f0xx/SConstruct
index 7979e3a23e..30f7822723 100644
--- a/bsp/stm32/libraries/templates/stm32f0xx/SConstruct
+++ b/bsp/stm32/libraries/templates/stm32f0xx/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/libraries/templates/stm32f10x/SConstruct b/bsp/stm32/libraries/templates/stm32f10x/SConstruct
index 27b5e7fccc..1a9f419db5 100644
--- a/bsp/stm32/libraries/templates/stm32f10x/SConstruct
+++ b/bsp/stm32/libraries/templates/stm32f10x/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/libraries/templates/stm32f2xx/SConstruct b/bsp/stm32/libraries/templates/stm32f2xx/SConstruct
index 46a3a2d905..bb2db4fecf 100644
--- a/bsp/stm32/libraries/templates/stm32f2xx/SConstruct
+++ b/bsp/stm32/libraries/templates/stm32f2xx/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/libraries/templates/stm32f4xx/SConstruct b/bsp/stm32/libraries/templates/stm32f4xx/SConstruct
index 629f25c6ee..945cb55a52 100644
--- a/bsp/stm32/libraries/templates/stm32f4xx/SConstruct
+++ b/bsp/stm32/libraries/templates/stm32f4xx/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/libraries/templates/stm32f7xx/SConstruct b/bsp/stm32/libraries/templates/stm32f7xx/SConstruct
index 782c1e6311..147d9a0e4a 100644
--- a/bsp/stm32/libraries/templates/stm32f7xx/SConstruct
+++ b/bsp/stm32/libraries/templates/stm32f7xx/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/libraries/templates/stm32h7xx/SConstruct b/bsp/stm32/libraries/templates/stm32h7xx/SConstruct
index c3520af530..48974d990f 100644
--- a/bsp/stm32/libraries/templates/stm32h7xx/SConstruct
+++ b/bsp/stm32/libraries/templates/stm32h7xx/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/libraries/templates/stm32l4xx/SConstruct b/bsp/stm32/libraries/templates/stm32l4xx/SConstruct
index 58a36adbfc..c4b3facad7 100644
--- a/bsp/stm32/libraries/templates/stm32l4xx/SConstruct
+++ b/bsp/stm32/libraries/templates/stm32l4xx/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32f072-st-nucleo/SConstruct b/bsp/stm32/stm32f072-st-nucleo/SConstruct
index 7979e3a23e..30f7822723 100644
--- a/bsp/stm32/stm32f072-st-nucleo/SConstruct
+++ b/bsp/stm32/stm32f072-st-nucleo/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32f091-st-nucleo/SConstruct b/bsp/stm32/stm32f091-st-nucleo/SConstruct
index 7979e3a23e..30f7822723 100644
--- a/bsp/stm32/stm32f091-st-nucleo/SConstruct
+++ b/bsp/stm32/stm32f091-st-nucleo/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32f103-atk-nano/SConstruct b/bsp/stm32/stm32f103-atk-nano/SConstruct
index 27b5e7fccc..1a9f419db5 100644
--- a/bsp/stm32/stm32f103-atk-nano/SConstruct
+++ b/bsp/stm32/stm32f103-atk-nano/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32f103-atk-warshipv3/SConstruct b/bsp/stm32/stm32f103-atk-warshipv3/SConstruct
index 27b5e7fccc..1a9f419db5 100644
--- a/bsp/stm32/stm32f103-atk-warshipv3/SConstruct
+++ b/bsp/stm32/stm32f103-atk-warshipv3/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32f103-dofly-M3S/SConstruct b/bsp/stm32/stm32f103-dofly-M3S/SConstruct
index 58c0dae36f..64aeaadb38 100644
--- a/bsp/stm32/stm32f103-dofly-M3S/SConstruct
+++ b/bsp/stm32/stm32f103-dofly-M3S/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32f103-dofly-lyc8/SConstruct b/bsp/stm32/stm32f103-dofly-lyc8/SConstruct
index c4c95cfdb8..a82a39499e 100644
--- a/bsp/stm32/stm32f103-dofly-lyc8/SConstruct
+++ b/bsp/stm32/stm32f103-dofly-lyc8/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32f103-fire-arbitrary/SConstruct b/bsp/stm32/stm32f103-fire-arbitrary/SConstruct
index 27b5e7fccc..1a9f419db5 100644
--- a/bsp/stm32/stm32f103-fire-arbitrary/SConstruct
+++ b/bsp/stm32/stm32f103-fire-arbitrary/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32f103-gizwits-gokitv21/SConstruct b/bsp/stm32/stm32f103-gizwits-gokitv21/SConstruct
index 27b5e7fccc..1a9f419db5 100644
--- a/bsp/stm32/stm32f103-gizwits-gokitv21/SConstruct
+++ b/bsp/stm32/stm32f103-gizwits-gokitv21/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32f103-hw100k-ibox/SConstruct b/bsp/stm32/stm32f103-hw100k-ibox/SConstruct
index 27b5e7fccc..1a9f419db5 100644
--- a/bsp/stm32/stm32f103-hw100k-ibox/SConstruct
+++ b/bsp/stm32/stm32f103-hw100k-ibox/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32f103-mini-system/SConstruct b/bsp/stm32/stm32f103-mini-system/SConstruct
index 27b5e7fccc..1a9f419db5 100644
--- a/bsp/stm32/stm32f103-mini-system/SConstruct
+++ b/bsp/stm32/stm32f103-mini-system/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32f103-yf-ufun/SConstruct b/bsp/stm32/stm32f103-yf-ufun/SConstruct
index 27b5e7fccc..1a9f419db5 100644
--- a/bsp/stm32/stm32f103-yf-ufun/SConstruct
+++ b/bsp/stm32/stm32f103-yf-ufun/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32f107-uc-eval/SConstruct b/bsp/stm32/stm32f107-uc-eval/SConstruct
index 27b5e7fccc..1a9f419db5 100644
--- a/bsp/stm32/stm32f107-uc-eval/SConstruct
+++ b/bsp/stm32/stm32f107-uc-eval/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32f401-st-nucleo/SConstruct b/bsp/stm32/stm32f401-st-nucleo/SConstruct
index 629f25c6ee..945cb55a52 100644
--- a/bsp/stm32/stm32f401-st-nucleo/SConstruct
+++ b/bsp/stm32/stm32f401-st-nucleo/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32f405-smdz-breadfruit/SConstruct b/bsp/stm32/stm32f405-smdz-breadfruit/SConstruct
index 110a631aea..6fbf23c9cf 100644
--- a/bsp/stm32/stm32f405-smdz-breadfruit/SConstruct
+++ b/bsp/stm32/stm32f405-smdz-breadfruit/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32f407-atk-explorer/SConstruct b/bsp/stm32/stm32f407-atk-explorer/SConstruct
index 629f25c6ee..945cb55a52 100644
--- a/bsp/stm32/stm32f407-atk-explorer/SConstruct
+++ b/bsp/stm32/stm32f407-atk-explorer/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32f407-st-discovery/SConstruct b/bsp/stm32/stm32f407-st-discovery/SConstruct
index b3728e2330..1684dc06b0 100644
--- a/bsp/stm32/stm32f407-st-discovery/SConstruct
+++ b/bsp/stm32/stm32f407-st-discovery/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32f411-st-nucleo/SConstruct b/bsp/stm32/stm32f411-st-nucleo/SConstruct
index b3728e2330..1684dc06b0 100644
--- a/bsp/stm32/stm32f411-st-nucleo/SConstruct
+++ b/bsp/stm32/stm32f411-st-nucleo/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32f412-st-nucleo/SConstruct b/bsp/stm32/stm32f412-st-nucleo/SConstruct
index 629f25c6ee..945cb55a52 100644
--- a/bsp/stm32/stm32f412-st-nucleo/SConstruct
+++ b/bsp/stm32/stm32f412-st-nucleo/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32f427-robomaster-a/SConstruct b/bsp/stm32/stm32f427-robomaster-a/SConstruct
index 629f25c6ee..945cb55a52 100644
--- a/bsp/stm32/stm32f427-robomaster-a/SConstruct
+++ b/bsp/stm32/stm32f427-robomaster-a/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32f429-armfly-v6/SConstruct b/bsp/stm32/stm32f429-armfly-v6/SConstruct
index 629f25c6ee..945cb55a52 100644
--- a/bsp/stm32/stm32f429-armfly-v6/SConstruct
+++ b/bsp/stm32/stm32f429-armfly-v6/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32f429-atk-apollo/SConstruct b/bsp/stm32/stm32f429-atk-apollo/SConstruct
index 629f25c6ee..945cb55a52 100644
--- a/bsp/stm32/stm32f429-atk-apollo/SConstruct
+++ b/bsp/stm32/stm32f429-atk-apollo/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32f429-fire-challenger/SConstruct b/bsp/stm32/stm32f429-fire-challenger/SConstruct
index 629f25c6ee..945cb55a52 100644
--- a/bsp/stm32/stm32f429-fire-challenger/SConstruct
+++ b/bsp/stm32/stm32f429-fire-challenger/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32f429-st-disco/SConstruct b/bsp/stm32/stm32f429-st-disco/SConstruct
index b3728e2330..1684dc06b0 100644
--- a/bsp/stm32/stm32f429-st-disco/SConstruct
+++ b/bsp/stm32/stm32f429-st-disco/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32f446-st-nucleo/SConstruct b/bsp/stm32/stm32f446-st-nucleo/SConstruct
index 629f25c6ee..945cb55a52 100644
--- a/bsp/stm32/stm32f446-st-nucleo/SConstruct
+++ b/bsp/stm32/stm32f446-st-nucleo/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32f469-st-disco/SConstruct b/bsp/stm32/stm32f469-st-disco/SConstruct
index b3728e2330..1684dc06b0 100644
--- a/bsp/stm32/stm32f469-st-disco/SConstruct
+++ b/bsp/stm32/stm32f469-st-disco/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32f746-st-disco/SConstruct b/bsp/stm32/stm32f746-st-disco/SConstruct
index ca0f33d692..050835a35a 100644
--- a/bsp/stm32/stm32f746-st-disco/SConstruct
+++ b/bsp/stm32/stm32f746-st-disco/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32f767-atk-apollo/SConstruct b/bsp/stm32/stm32f767-atk-apollo/SConstruct
index ca0f33d692..050835a35a 100644
--- a/bsp/stm32/stm32f767-atk-apollo/SConstruct
+++ b/bsp/stm32/stm32f767-atk-apollo/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32f767-fire-challenger/SConstruct b/bsp/stm32/stm32f767-fire-challenger/SConstruct
index ca0f33d692..050835a35a 100644
--- a/bsp/stm32/stm32f767-fire-challenger/SConstruct
+++ b/bsp/stm32/stm32f767-fire-challenger/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32f767-st-nucleo/SConstruct b/bsp/stm32/stm32f767-st-nucleo/SConstruct
index 782c1e6311..147d9a0e4a 100644
--- a/bsp/stm32/stm32f767-st-nucleo/SConstruct
+++ b/bsp/stm32/stm32f767-st-nucleo/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32f769-st-disco/SConstruct b/bsp/stm32/stm32f769-st-disco/SConstruct
index 782c1e6311..147d9a0e4a 100644
--- a/bsp/stm32/stm32f769-st-disco/SConstruct
+++ b/bsp/stm32/stm32f769-st-disco/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32g071-st-nucleo/SConstruct b/bsp/stm32/stm32g071-st-nucleo/SConstruct
index 9de90da39b..96fd191077 100644
--- a/bsp/stm32/stm32g071-st-nucleo/SConstruct
+++ b/bsp/stm32/stm32g071-st-nucleo/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32g431-st-nucleo/SConstruct b/bsp/stm32/stm32g431-st-nucleo/SConstruct
index 5e0b111295..d32015f991 100644
--- a/bsp/stm32/stm32g431-st-nucleo/SConstruct
+++ b/bsp/stm32/stm32g431-st-nucleo/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32h743-atk-apollo/SConstruct b/bsp/stm32/stm32h743-atk-apollo/SConstruct
index 7cf638765c..a7cc0cb251 100644
--- a/bsp/stm32/stm32h743-atk-apollo/SConstruct
+++ b/bsp/stm32/stm32h743-atk-apollo/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32h743-st-nucleo/SConstruct b/bsp/stm32/stm32h743-st-nucleo/SConstruct
index c3520af530..48974d990f 100644
--- a/bsp/stm32/stm32h743-st-nucleo/SConstruct
+++ b/bsp/stm32/stm32h743-st-nucleo/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32l053-st-nucleo/SConstruct b/bsp/stm32/stm32l053-st-nucleo/SConstruct
index b158e3828b..5fcb889bc2 100644
--- a/bsp/stm32/stm32l053-st-nucleo/SConstruct
+++ b/bsp/stm32/stm32l053-st-nucleo/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32l432-st-nucleo/SConstruct b/bsp/stm32/stm32l432-st-nucleo/SConstruct
index 58a36adbfc..c4b3facad7 100644
--- a/bsp/stm32/stm32l432-st-nucleo/SConstruct
+++ b/bsp/stm32/stm32l432-st-nucleo/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32l452-st-nucleo/SConstruct b/bsp/stm32/stm32l452-st-nucleo/SConstruct
index 58a36adbfc..c4b3facad7 100644
--- a/bsp/stm32/stm32l452-st-nucleo/SConstruct
+++ b/bsp/stm32/stm32l452-st-nucleo/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32l475-atk-pandora/SConstruct b/bsp/stm32/stm32l475-atk-pandora/SConstruct
index 58a36adbfc..c4b3facad7 100644
--- a/bsp/stm32/stm32l475-atk-pandora/SConstruct
+++ b/bsp/stm32/stm32l475-atk-pandora/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32l475-st-discovery/SConstruct b/bsp/stm32/stm32l475-st-discovery/SConstruct
index 1a3000812b..44df6b339e 100644
--- a/bsp/stm32/stm32l475-st-discovery/SConstruct
+++ b/bsp/stm32/stm32l475-st-discovery/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32l476-st-nucleo/SConstruct b/bsp/stm32/stm32l476-st-nucleo/SConstruct
index 58a36adbfc..c4b3facad7 100644
--- a/bsp/stm32/stm32l476-st-nucleo/SConstruct
+++ b/bsp/stm32/stm32l476-st-nucleo/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32l496-ali-developer/SConstruct b/bsp/stm32/stm32l496-ali-developer/SConstruct
index 58a36adbfc..c4b3facad7 100644
--- a/bsp/stm32/stm32l496-ali-developer/SConstruct
+++ b/bsp/stm32/stm32l496-ali-developer/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rt-thread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32/stm32l4r9-st-eval/SConstruct b/bsp/stm32/stm32l4r9-st-eval/SConstruct
index 1a3000812b..44df6b339e 100644
--- a/bsp/stm32/stm32l4r9-st-eval/SConstruct
+++ b/bsp/stm32/stm32l4r9-st-eval/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/stm32f20x/SConstruct b/bsp/stm32f20x/SConstruct
index ae13ebd5bf..90ea00f7c3 100644
--- a/bsp/stm32f20x/SConstruct
+++ b/bsp/stm32f20x/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread-stm32f2xx.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/swm320-lq100/SConstruct b/bsp/swm320-lq100/SConstruct
index 44567aea78..8418d596c0 100644
--- a/bsp/swm320-lq100/SConstruct
+++ b/bsp/swm320-lq100/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/synopsys/emsk_em9d/SConstruct b/bsp/synopsys/emsk_em9d/SConstruct
index a93d89ee74..d8e88ebeea 100644
--- a/bsp/synopsys/emsk_em9d/SConstruct
+++ b/bsp/synopsys/emsk_em9d/SConstruct
@@ -32,6 +32,7 @@ if GetOption('gdb'):
             print rtconfig.TARGET + 'not exist, please build first!!'
         exit(0)
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
         AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
         CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/taihu/SConstruct b/bsp/taihu/SConstruct
index b4d528437b..406751b251 100644
--- a/bsp/taihu/SConstruct
+++ b/bsp/taihu/SConstruct
@@ -16,6 +16,7 @@ cwd = GetCurrentDir()
 rtconfig.AFLAGS = rtconfig.AFLAGS + ' -I' + RTT_ROOT + '/libcpu/ppc/ppc405/include '
 rtconfig.CFLAGS = rtconfig.CFLAGS + ' -I' + RTT_ROOT + '/libcpu/ppc/ppc405/include '
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/tm4c129x/SConstruct b/bsp/tm4c129x/SConstruct
index 16877dd5b4..16bff0b3be 100644
--- a/bsp/tm4c129x/SConstruct
+++ b/bsp/tm4c129x/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/upd70f3454/SConstruct b/bsp/upd70f3454/SConstruct
index a342385d85..bd9d98a726 100644
--- a/bsp/upd70f3454/SConstruct
+++ b/bsp/upd70f3454/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT 
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/w60x/SConstruct b/bsp/w60x/SConstruct
index 713fe15443..ac79195833 100644
--- a/bsp/w60x/SConstruct
+++ b/bsp/w60x/SConstruct
@@ -17,6 +17,7 @@ except:
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/x1000/SConstruct b/bsp/x1000/SConstruct
index 39cc9d945c..053d160121 100644
--- a/bsp/x1000/SConstruct
+++ b/bsp/x1000/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread-x1000.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/x86/SConstruct b/bsp/x86/SConstruct
index c885c34448..d58455158e 100644
--- a/bsp/x86/SConstruct
+++ b/bsp/x86/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/xplorer4330/M0/SConstruct b/bsp/xplorer4330/M0/SConstruct
index 62cebd454f..3e98f7a5d6 100644
--- a/bsp/xplorer4330/M0/SConstruct
+++ b/bsp/xplorer4330/M0/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread-lpc40xx.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/xplorer4330/M4/SConstruct b/bsp/xplorer4330/M4/SConstruct
index 62cebd454f..3e98f7a5d6 100644
--- a/bsp/xplorer4330/M4/SConstruct
+++ b/bsp/xplorer4330/M4/SConstruct
@@ -12,6 +12,7 @@ from building import *
 
 TARGET = 'rtthread-lpc40xx.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
diff --git a/bsp/zynq7000/SConstruct b/bsp/zynq7000/SConstruct
index 9d9b35277a..d06010997d 100644
--- a/bsp/zynq7000/SConstruct
+++ b/bsp/zynq7000/SConstruct
@@ -14,6 +14,7 @@ from building import *
 
 TARGET = 'rtthread-zynq7000.' + rtconfig.TARGET_EXT
 
+DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
         AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
         CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,