diff --git a/bsp/CME_M7/SConstruct b/bsp/CME_M7/SConstruct
index 4d5dfc1d4dcfd4857f13049d8e658101e00a8d12..0f0407128d5c759a2712a08e279e7d055273304b 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 f0c508ba6d0e0f565ef9154ec3a6da6050345b90..9a1fa924e11bb7145b4cf672ffa911fc16b06b8a 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 713fe1544307e0b1c4b49165a5375a1665794411..ac791958337caba15ec8cd8f32fe5f13b21c13d7 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 1f57277560a1c2e5863acb7313fb5ab7f9664a40..1cbda577ee7c626ce16f7fa4c4c1430752cb646a 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 98b5712caf864a3e337df0e335ce8901f1e4e3f6..eb7290cf6f15f8c9d5fa193e4dbd3864e40e78c4 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 7ce3af43b67c31636622e31d5ddcc61b916a3f2b..f91ca8c0a4c20f97435b3d63e6e9c18edc684003 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 41139a3377362a84276e7356082260e740ebf47e..66063a0bf7b2541f882b452e24e0d2a8dfd165f0 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 834d66615f32d5017fb70902dcbc4e87ddbcdb9f..20556cce2c630c952f5e6e15f3d29a92c1de6e70 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 6b19269c47c69b4d0f6f601e1fbe9e7944a24a23..5a9b7e82ba803c7ef1c229da98d094091fcecb61 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 6c54a5b595f4d2e7d4e73c067f0dfe239a0d240b..eeb3a3a2360b54d4cda650da17439fa95e4db930 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 fc6cffa67c55430db8a3e4d4de0662a128408e50..edd5cba974cfc8f8d7f5d1db45019f72d2039daa 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 4849771bf061a9d90d1bcddf7351f8471816b000..3adbb60a52672436b6127d6bb2a7262caa5affc2 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 713fe1544307e0b1c4b49165a5375a1665794411..ac791958337caba15ec8cd8f32fe5f13b21c13d7 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 713fe1544307e0b1c4b49165a5375a1665794411..ac791958337caba15ec8cd8f32fe5f13b21c13d7 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 7f9e572807b801903c178572b3cbf510e8e255a6..02528da49f38574d0703098f73b2aa1de2bc20c4 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 eb4f3d8eacfbb9451728d85ddabedea5275fc4db..4e87070d642356864a24d8c1258ea8d3b4bbe799 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 1cdbaab4a87a282cc5e79c430eea5eaaabc46e5d..215861f94cb6efa359e555b9ff75907b6ef38282 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 adf9077eac4122428181b32e0310214d3596933f..62726d6ee862c21e922588a600db62b04076e822 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 57a8ac59fc3cc45c641e1ec26a51c4ade355160d..091f38e9835896fa4ca9868ec295e15329fc7dda 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 3caac2f35db63d3b0daa597e643d79fc390ae4a9..33ab37287ff821f04c0ae0d695a4af845ccafffa 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 eebbcf399656398b8c73a3555635b0a6697a0f96..cc15e4b677ee014fe347b11fc450202566ab56c0 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 da359a3016a99581e66d174a8418e8da257b8e6a..c3051306e4f69e0e62dcab10f2b97255602345d3 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 c76066ac37e3758b6c6f6f7b0c95a9e5585454ba..c92339130eea7d01c7cd1a62ce21c66d27bb59ce 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 eaf40ea2d8bb2f70f94b3e30e3822e18606162b4..9483ea927d0fd610de84b9db00da263c9492e7f0 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 8d27d0e1994965bf5b80a5046cb99a37b7d89ae8..9e5cd55bc0f23b2cf633a6c4f30bb6b3fe62585c 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 8d27d0e1994965bf5b80a5046cb99a37b7d89ae8..9e5cd55bc0f23b2cf633a6c4f30bb6b3fe62585c 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 8d27d0e1994965bf5b80a5046cb99a37b7d89ae8..9e5cd55bc0f23b2cf633a6c4f30bb6b3fe62585c 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 15f504bd6c8e8bbdc408e2dc768cb1354ecf62d8..71be0c13c696ff3a28229fc4121020a44c1ae381 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 3ba89ccafeae95ac70c0bcde48e4b67ef4c2530e..b420dfedb22b1cc27b3fb201d18e030a1d719565 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 15f504bd6c8e8bbdc408e2dc768cb1354ecf62d8..71be0c13c696ff3a28229fc4121020a44c1ae381 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 dc55b291944795d8ce68a7240b231e2638385328..20bae7eee9ba4859e48c5e720e17b2b2e3e59939 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 c829512b41ad2221e7019c6914c70a655e8fe559..966e5b398ff3776f045b94726fdb0d1523805419 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 3542c5c40c8c9238ea322f1ea4a7d81f4482e748..efa0d1ef96b7c23422b1f4e31b16bb780b2ad630 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 16877dd5b4a83494dfa80d8bbfb53dff7a27806c..16bff0b3be8c631e785a23a587f77b1c675f7b08 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 3f3d509e2f615f1db6648fb1b1c69bc70fa67765..71da42a029e68034ad70fb80d91efe5139276984 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 4afcf966024d0ccaeedcae19db14cab70217b37e..7cce9135bb67ea79e477cc37ccf738027a55ea20 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 8503d8053c963d7490937e56b01306e9ba7e00e8..526de324cdf6bd29788dd5e4f56727656214eb81 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 e1d4c19aac166a6b9e0e80ae49f06be786e9d964..d5dc943c14b01956f5ad62c7455cb5c725676bc8 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 b209a1a2ecf7d3752ad182535d22ff2f1cff557c..e57eb2752b00278f938490b4129130e4bf88c6c5 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 22bb73b311c4593a6ba56414761a7363cc3568e3..cd9f21156b29b3d3e76522dd515fd21fa347b34d 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 c0d1d2fdc0e52b0c25b4966d1fa33d43f398577d..3a52eb9a430a9d5073509fe9efd35fe3202d43a4 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 a6390025a3f0f0d004fd27842936bab5d444d59e..bcdc7f03eb63d2c1569c0d078504a2370227fef8 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 fb728723bc79c34a28627a862ea05693250906e2..db26ec3568e58afb819730568c8adb1d3c7de318 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 aa0f6a15a31cb465e7fce44740e75d084e3e8daf..d784bbb0c862b798ee117fc21589a0c0a6418e72 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 a2d74ca0407fbb42c810e5d9956715312b659910..e821687fc12a2d3270a66d249f9737334b74059e 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 a87696475dc26381b8ad6fdaaf70cd917d11c298..13c205c1d29e06ac52f10108533931aa093b771e 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 17e1d15db3ffb65e64b8752479503595efae1aa2..cc52d5f22d2fe43cca153c4c39d458153501edda 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 a2f2cae17868b8448cae6ac002b973a5ef9b9242..7006f4f2de9245f241deda7471f9c47c337f5935 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 02b05a150c7274bd00d55f712c83d413c4614bcf..8c5b7cd5e1aae6cb6e199a136cf8aff217e52019 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 be2a125e2c90b806083a550b19a17def0fc0ba7b..6c02b383f27364a93d6f4b7ee1c9bca42591c87e 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 5c060833f4d2cdd1a58ddd09133b3636f86704c8..ab0b74817aab20052faa1ea1c02761661af6bced 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 2a092f5a7e3ccb3156e975dea37caee1e3007241..bb8ca269900f11df9d7b584eabaabbcaed0d8cf0 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 5c060833f4d2cdd1a58ddd09133b3636f86704c8..ab0b74817aab20052faa1ea1c02761661af6bced 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 76e219bff33b9091c8da621d5bf3b2f353891ec6..a89673811c94b915e6a4227a233e5ad940779bfe 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 c40ec891fae7a8d1e31f69d83f41576be79a0ea1..81d08b0cdd9788aff99a60877eb5fb301cd380d0 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 44567aea789095044b87d7e623dc941ebfd7de7b..8418d596c0e105a12aed0c3362b22187e47804f8 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 44567aea789095044b87d7e623dc941ebfd7de7b..8418d596c0e105a12aed0c3362b22187e47804f8 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 5813f6442c55a224cd11d43ebea0545a17a88c3c..c46e9fb9e7b98f321da62941db5a1f57e55b2ed1 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 78a2f594b5b01e697faf97fa7221e1c78372d422..f093ad6de7c00a2e8f68a56c85ffa7ab22064f2c 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 7fad129d8eb214a805687643ca359c43ada56610..cdb079382a865cedfb4010d67289ea310c328b44 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 b7994463ee19ae14009c150f6af1f0e3bc99348e..28df4094189a44e7f148b6c710d263914cd1f83f 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 28e427976394f4812091d7feec78a4cf03c3d8ba..c27699fbb73bbca88662a169b9085211895737a2 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 9257163aef00a74eec7406f24d75f870b25431dd..0c9b103d6e818b6735e787f585ad3efc00ea31cb 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 47ac06abf22d1c1279b4855796a0da6e869dd561..951c03f2d070299f7abb0ab698bed935ba06849f 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 d618790dec9dc03404532b0d749f32356a5f125f..ddfe03da28069040e4db9e96b30b6a4d0e2dba4f 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 765abd555aa166c8342404431c3dff303ea05a4b..140316ad06b30f9f16541ac9782f5f32de9dbdd7 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 1326632477d9d6ee64fba20de59a630de0d8a0ef..e5acdb25548702c513aec33c8b95e93b9645be12 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 0885dbfc0e1d145221c2cbaf341e136123c124a9..2ba0e9f457a778d9e63ec4986869960659d295e6 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 44e0a61ac79ae843979f14d6f9bd80282fd26ccd..1abf18b6263d744760abe1d8ea39da1193b96d6d 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 b314d10ce9dc1551322c2635a931553e8162bc72..b902c7522ad40e6a460e8f809246abf472735fe5 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 83714f5ad833dd1892639c878d28bd6427a00bce..c257fdcb3920f7d8d503154642b80ad4dcd23ba6 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 0773dea2fa1980f5688cf24614c176763f8f4ce8..2fb8879b880912b907db96d31e4c197c59489c05 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 7c6bc8e0320214461df6a074454b33fd968ece9b..bd3b704767985d62cd1b9a200d2b29ba046186f4 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 0298679528b6d8febc1593a715ad21254bbd9bcc..67248410756d7719617b6afb4471f6713b39f180 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 7979e3a23ed06d9558cf03e7108fa9249ff9ef78..30f78227237b5a4d3512ac866df32797880b686c 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 27b5e7fccce3302bc36debeac6842b661a04a663..1a9f419db5f2f6009aad0e8e896c318439ba3ed3 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 46a3a2d905bfbe8aecb55ba9c724407f7a3f4898..bb2db4fecf3a1573e2e4afb121f131f43df10e89 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 629f25c6ee6f4a645c8eec066935e414c62753a0..945cb55a525ed8ab54c52465c9a6232c2b0c598a 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 782c1e6311a09ed9c007cc7db3c09bc2e538ca5e..147d9a0e4af657223a964ac1537eb1928042cf59 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 c3520af5301a28da08aa44113071a0e8e7bfcdb2..48974d990f93100c8fc7a4b64328082a56cadd72 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 58a36adbfcda854f736ce3ae40262f4cdf92a9b0..c4b3facad705726da1a023d2c1139ba856102500 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 7979e3a23ed06d9558cf03e7108fa9249ff9ef78..30f78227237b5a4d3512ac866df32797880b686c 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 7979e3a23ed06d9558cf03e7108fa9249ff9ef78..30f78227237b5a4d3512ac866df32797880b686c 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 27b5e7fccce3302bc36debeac6842b661a04a663..1a9f419db5f2f6009aad0e8e896c318439ba3ed3 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 27b5e7fccce3302bc36debeac6842b661a04a663..1a9f419db5f2f6009aad0e8e896c318439ba3ed3 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 58c0dae36fd5338ce8329be2db4ac0e0136bf28b..64aeaadb381bad08e72e383723ba0364884d58dd 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 c4c95cfdb86f9aa8611cb3cac355ed39ae3557f2..a82a39499e200196e922846b124c0400b4707536 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 27b5e7fccce3302bc36debeac6842b661a04a663..1a9f419db5f2f6009aad0e8e896c318439ba3ed3 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 27b5e7fccce3302bc36debeac6842b661a04a663..1a9f419db5f2f6009aad0e8e896c318439ba3ed3 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 27b5e7fccce3302bc36debeac6842b661a04a663..1a9f419db5f2f6009aad0e8e896c318439ba3ed3 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 27b5e7fccce3302bc36debeac6842b661a04a663..1a9f419db5f2f6009aad0e8e896c318439ba3ed3 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 27b5e7fccce3302bc36debeac6842b661a04a663..1a9f419db5f2f6009aad0e8e896c318439ba3ed3 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 27b5e7fccce3302bc36debeac6842b661a04a663..1a9f419db5f2f6009aad0e8e896c318439ba3ed3 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 629f25c6ee6f4a645c8eec066935e414c62753a0..945cb55a525ed8ab54c52465c9a6232c2b0c598a 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 110a631aea786e15de301a8e160104858df4472d..6fbf23c9cf99a4f1ad954c4576b7d175e0b0424d 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 629f25c6ee6f4a645c8eec066935e414c62753a0..945cb55a525ed8ab54c52465c9a6232c2b0c598a 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 b3728e2330ef0555940b38fe18eab9a53bac8712..1684dc06b0eba3630758f59bf031a98000a1cf98 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 b3728e2330ef0555940b38fe18eab9a53bac8712..1684dc06b0eba3630758f59bf031a98000a1cf98 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 629f25c6ee6f4a645c8eec066935e414c62753a0..945cb55a525ed8ab54c52465c9a6232c2b0c598a 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 629f25c6ee6f4a645c8eec066935e414c62753a0..945cb55a525ed8ab54c52465c9a6232c2b0c598a 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 629f25c6ee6f4a645c8eec066935e414c62753a0..945cb55a525ed8ab54c52465c9a6232c2b0c598a 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 629f25c6ee6f4a645c8eec066935e414c62753a0..945cb55a525ed8ab54c52465c9a6232c2b0c598a 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 629f25c6ee6f4a645c8eec066935e414c62753a0..945cb55a525ed8ab54c52465c9a6232c2b0c598a 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 b3728e2330ef0555940b38fe18eab9a53bac8712..1684dc06b0eba3630758f59bf031a98000a1cf98 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 629f25c6ee6f4a645c8eec066935e414c62753a0..945cb55a525ed8ab54c52465c9a6232c2b0c598a 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 b3728e2330ef0555940b38fe18eab9a53bac8712..1684dc06b0eba3630758f59bf031a98000a1cf98 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 ca0f33d6925bcb25f33c4786cafcaf421fc9e9ec..050835a35aa7256f3ac51b8129196f3d2cb5bf7d 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 ca0f33d6925bcb25f33c4786cafcaf421fc9e9ec..050835a35aa7256f3ac51b8129196f3d2cb5bf7d 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 ca0f33d6925bcb25f33c4786cafcaf421fc9e9ec..050835a35aa7256f3ac51b8129196f3d2cb5bf7d 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 782c1e6311a09ed9c007cc7db3c09bc2e538ca5e..147d9a0e4af657223a964ac1537eb1928042cf59 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 782c1e6311a09ed9c007cc7db3c09bc2e538ca5e..147d9a0e4af657223a964ac1537eb1928042cf59 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 9de90da39b9fe11da74de6e618a2e7a4828b4816..96fd191077eeca7036e04d4314ebcd6d0f9e8746 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 5e0b111295dd0cdea259b6a7370bc854646e955f..d32015f991bd8dc80e0a278b63ba9fdf0e4b28a3 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 7cf638765c627ab91c5424387e713db7872b9d6a..a7cc0cb251f80377597b92b80c87137667d53b8d 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 c3520af5301a28da08aa44113071a0e8e7bfcdb2..48974d990f93100c8fc7a4b64328082a56cadd72 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 b158e3828bdc2858e6931c66c0a90059a4f342e3..5fcb889bc2115250b75b23f72b46d56100176284 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 58a36adbfcda854f736ce3ae40262f4cdf92a9b0..c4b3facad705726da1a023d2c1139ba856102500 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 58a36adbfcda854f736ce3ae40262f4cdf92a9b0..c4b3facad705726da1a023d2c1139ba856102500 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 58a36adbfcda854f736ce3ae40262f4cdf92a9b0..c4b3facad705726da1a023d2c1139ba856102500 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 1a3000812b9c3e73ea12c69a154ca85b25894b3d..44df6b339edeb3ff2f369c16cb0ed3b6cfd88520 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 58a36adbfcda854f736ce3ae40262f4cdf92a9b0..c4b3facad705726da1a023d2c1139ba856102500 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 58a36adbfcda854f736ce3ae40262f4cdf92a9b0..c4b3facad705726da1a023d2c1139ba856102500 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 1a3000812b9c3e73ea12c69a154ca85b25894b3d..44df6b339edeb3ff2f369c16cb0ed3b6cfd88520 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 ae13ebd5bf4f5268f553c96e0779cf1f290c2f8e..90ea00f7c30635f311ee4f3d7e07fdef735c0ed4 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 44567aea789095044b87d7e623dc941ebfd7de7b..8418d596c0e105a12aed0c3362b22187e47804f8 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 a93d89ee747a8e83882aad98f406b26ac47bd188..d8e88ebeea97b4e8fbc0f501432d5ad72af89e2a 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 b4d528437bd5e67e1fe8faf0b0bf98641f5dc1d8..406751b251953e0973089f369e20c594d92e41c7 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 16877dd5b4a83494dfa80d8bbfb53dff7a27806c..16bff0b3be8c631e785a23a587f77b1c675f7b08 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 a342385d852403ad1dd373ba4060f6bf0bf377cd..bd9d98a726a04b1b2b67afe5c0849cd99313b8d7 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 713fe1544307e0b1c4b49165a5375a1665794411..ac791958337caba15ec8cd8f32fe5f13b21c13d7 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 39cc9d945c5bd93e37eda8694afae269d81ab015..053d160121f823d1fa38511a816c456b014d4891 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 c885c34448dcf7d630650fce543980a5999f8115..d58455158ebd94645fc8fcd947ec3aa074489daf 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 62cebd454f00f5daaa13f1067da47aa6dc361b52..3e98f7a5d6e01413ac3d7ec97ad2af3269d3da82 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 62cebd454f00f5daaa13f1067da47aa6dc361b52..3e98f7a5d6e01413ac3d7ec97ad2af3269d3da82 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 9d9b35277a981d5a31340c568cf1bf8c63c8c20d..d06010997db4c9da9c9bc24c50465e22abcf9a85 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,