21 files changed, 4 insertions, 18 deletions
diff --git a/components/libc/compilers/common/nogcc/SConscript b/components/libc/compilers/common/extension/SConscript
index dbc26ac177..dbc26ac177 100644
--- a/components/libc/compilers/common/nogcc/SConscript
+++ b/components/libc/compilers/common/extension/SConscript
diff --git a/components/libc/compilers/common/nogcc/fcntl.h b/components/libc/compilers/common/extension/fcntl.h
index 83c3ec0b6b..83c3ec0b6b 100644
--- a/components/libc/compilers/common/nogcc/fcntl.h
+++ b/components/libc/compilers/common/extension/fcntl.h
diff --git a/components/libc/compilers/common/extension/readme.md b/components/libc/compilers/common/extension/readme.md
new file mode 100644
index 0000000000..ca0df69246
--- /dev/null
+++ b/components/libc/compilers/common/extension/readme.md
@@ -0,0 +1,4 @@
+## Attentions
+
+This folder is "common" for toolchains, which only support ISO C, as an extension part, such as Keil-MDK and IAR.
+
diff --git a/components/libc/compilers/common/nogcc/sys/errno.h b/components/libc/compilers/common/extension/sys/errno.h
index d53ce4b386..d53ce4b386 100644
--- a/components/libc/compilers/common/nogcc/sys/errno.h
+++ b/components/libc/compilers/common/extension/sys/errno.h
diff --git a/components/libc/compilers/common/nogcc/sys/select.h b/components/libc/compilers/common/extension/sys/select.h
index 44f9b4ed91..44f9b4ed91 100644
--- a/components/libc/compilers/common/nogcc/sys/select.h
+++ b/components/libc/compilers/common/extension/sys/select.h
diff --git a/components/libc/compilers/common/nogcc/sys/stat.h b/components/libc/compilers/common/extension/sys/stat.h
index 107c15decf..107c15decf 100644
--- a/components/libc/compilers/common/nogcc/sys/stat.h
+++ b/components/libc/compilers/common/extension/sys/stat.h
diff --git a/components/libc/compilers/common/nogcc/sys/types.h b/components/libc/compilers/common/extension/sys/types.h
index 32b2493c95..32b2493c95 100644
--- a/components/libc/compilers/common/nogcc/sys/types.h
+++ b/components/libc/compilers/common/extension/sys/types.h
diff --git a/components/libc/compilers/common/nogcc/sys/unistd.h b/components/libc/compilers/common/extension/sys/unistd.h
index 650c87dc18..650c87dc18 100644
--- a/components/libc/compilers/common/nogcc/sys/unistd.h
+++ b/components/libc/compilers/common/extension/sys/unistd.h
diff --git a/components/libc/compilers/common/nogcc/unistd.h b/components/libc/compilers/common/extension/unistd.h
index 4dd71c842e..4dd71c842e 100644
--- a/components/libc/compilers/common/nogcc/unistd.h
+++ b/components/libc/compilers/common/extension/unistd.h
diff --git a/components/libc/compilers/common/nogcc/readme.md b/components/libc/compilers/common/nogcc/readme.md
deleted file mode 100644
index b10940d003..0000000000
--- a/components/libc/compilers/common/nogcc/readme.md
+++ /dev/null
@@ -1,3 +0,0 @@
-## Attentions
-
-This folder is "common" for toolchains excluding gcc.
-\ No newline at end of file
diff --git a/components/libc/compilers/gcc/newlib/legacy/SConscript b/components/libc/compilers/gcc/newlib/legacy/SConscript
deleted file mode 100644
index 4c815c49b8..0000000000
--- a/components/libc/compilers/gcc/newlib/legacy/SConscript
+++ /dev/null
@@ -1,15 +0,0 @@
-# RT-Thread building script for bridge
-
-import os
-from building import *
-
-cwd = GetCurrentDir()
-objs = []
-list = os.listdir(cwd)
-
-for d in list:
-    path = os.path.join(cwd, d)
-    if os.path.isfile(os.path.join(path, 'SConscript')):
-        objs = objs + SConscript(os.path.join(d, 'SConscript'))
-
-Return('objs')
diff --git a/components/libc/compilers/gcc/newlib/README.md b/components/libc/compilers/newlib/README.md
index 4614375b45..4614375b45 100644
--- a/components/libc/compilers/gcc/newlib/README.md
+++ b/components/libc/compilers/newlib/README.md
diff --git a/components/libc/compilers/gcc/newlib/SConscript b/components/libc/compilers/newlib/SConscript
index 8076a73727..8076a73727 100644
--- a/components/libc/compilers/gcc/newlib/SConscript
+++ b/components/libc/compilers/newlib/SConscript
diff --git a/components/libc/compilers/gcc/newlib/fcntl.h b/components/libc/compilers/newlib/fcntl.h
index 847ae3d35b..847ae3d35b 100644
--- a/components/libc/compilers/gcc/newlib/fcntl.h
+++ b/components/libc/compilers/newlib/fcntl.h
diff --git a/components/libc/compilers/gcc/SConscript b/components/libc/compilers/newlib/legacy/SConscript
index 4c815c49b8..4c815c49b8 100644
--- a/components/libc/compilers/gcc/SConscript
+++ b/components/libc/compilers/newlib/legacy/SConscript
diff --git a/components/libc/compilers/gcc/newlib/legacy/_select/SConscript b/components/libc/compilers/newlib/legacy/_select/SConscript
index b7bd86a36c..b7bd86a36c 100644
--- a/components/libc/compilers/gcc/newlib/legacy/_select/SConscript
+++ b/components/libc/compilers/newlib/legacy/_select/SConscript
diff --git a/components/libc/compilers/gcc/newlib/legacy/_select/readme.md b/components/libc/compilers/newlib/legacy/_select/readme.md
index 4ad9f21923..4ad9f21923 100644
--- a/components/libc/compilers/gcc/newlib/legacy/_select/readme.md
+++ b/components/libc/compilers/newlib/legacy/_select/readme.md
diff --git a/components/libc/compilers/gcc/newlib/legacy/_select/sys/select.h b/components/libc/compilers/newlib/legacy/_select/sys/select.h
index 02fb77dd89..02fb77dd89 100644
--- a/components/libc/compilers/gcc/newlib/legacy/_select/sys/select.h
+++ b/components/libc/compilers/newlib/legacy/_select/sys/select.h
diff --git a/components/libc/compilers/gcc/newlib/libc_syms.c b/components/libc/compilers/newlib/libc_syms.c
index e6ca23b393..e6ca23b393 100644
--- a/components/libc/compilers/gcc/newlib/libc_syms.c
+++ b/components/libc/compilers/newlib/libc_syms.c
diff --git a/components/libc/compilers/gcc/newlib/machine/time.h b/components/libc/compilers/newlib/machine/time.h
index 805b061aea..805b061aea 100644
--- a/components/libc/compilers/gcc/newlib/machine/time.h
+++ b/components/libc/compilers/newlib/machine/time.h
diff --git a/components/libc/compilers/gcc/newlib/syscalls.c b/components/libc/compilers/newlib/syscalls.c
index dcf26ccfb7..dcf26ccfb7 100644
--- a/components/libc/compilers/gcc/newlib/syscalls.c
+++ b/components/libc/compilers/newlib/syscalls.c