[posix] 将posix单独划分为一个Kconfig目录

components/libc/Kconfig

 menu "POSIX layer and C standard library"
 
 config RT_USING_LIBC
-    bool "Enable libc APIs from toolchain"
+    bool "Enable libc APIs from the toolchain"
     default n
 
 if RT_USING_LIBC
@@ -37,59 +37,6 @@ config RT_LIBC_DEFAULT_TIMEZONE
     range -12 12
     default 8
 
-config RT_USING_POSIX_FS
-    bool "Enable POSIX file system, open()/read()/write()/close() etc"
-    select RT_USING_DFS
-    select DFS_USING_POSIX
-    default n
-
-if RT_USING_POSIX_FS
-    config RT_USING_POSIX_DEVIO
-        bool "Enable devices as file descriptors"
-        select RT_USING_DFS_DEVFS
-        default n
-
-    config RT_USING_POSIX_POLL
-        bool "Enable poll()"
-        default n
-
-    config RT_USING_POSIX_SELECT
-        bool "Enable select()"
-        select RT_USING_POSIX_POLL
-        default n
-endif
-
-config RT_USING_POSIX_DELAY
-    bool "Enable delay APIs, sleep()/usleep()/msleep() etc"
-    default n
-
-config RT_USING_POSIX_GETLINE
-    bool "Enable getline()/getdelim()"
-    select RT_USING_LIBC
-    select RT_LIBC_USING_FILEIO
-    default n
-
-config RT_USING_POSIX_MMAP
-    bool "Enable mmap()"
-    select RT_USING_POSIX_FS
-    default n
-
-config RT_USING_POSIX_TERMIOS
-    bool "Enable termios APIs"
-    default n
-
-config RT_USING_POSIX_AIO
-    bool "Enable AIO APIs"
-    default n
-
-config RT_USING_PTHREADS
-    bool "Enable pthreads APIs"
-    default n
-
-if RT_USING_PTHREADS
-    config PTHREAD_NUM_MAX
-        int "Maximum number of pthreads"
-        default 8
-endif
+source "$RTT_DIR/components/libc/posix/Kconfig"
 
 endmenu

components/libc/posix/Kconfig

+menu "POSIX (Portable Operating System Interface) layer"
+
+config RT_USING_POSIX_FS
+    bool "Enable POSIX file system, open()/read()/write()/close() etc"
+    select RT_USING_DFS
+    select DFS_USING_POSIX
+    default n
+
+if RT_USING_POSIX_FS
+    config RT_USING_POSIX_DEVIO
+        bool "Enable devices as file descriptors"
+        select RT_USING_DFS_DEVFS
+        default n
+
+    config RT_USING_POSIX_POLL
+        bool "Enable poll()"
+        default n
+
+    config RT_USING_POSIX_SELECT
+        bool "Enable select()"
+        select RT_USING_POSIX_POLL
+        default n
+endif
+
+config RT_USING_POSIX_DELAY
+    bool "Enable delay APIs, sleep()/usleep()/msleep() etc"
+    default n
+
+config RT_USING_POSIX_GETLINE
+    bool "Enable getline()/getdelim()"
+    select RT_USING_LIBC
+    select RT_LIBC_USING_FILEIO
+    default n
+
+config RT_USING_POSIX_MMAP
+    bool "Enable mmap()"
+    select RT_USING_POSIX_FS
+    default n
+
+config RT_USING_POSIX_TERMIOS
+    bool "Enable termios APIs"
+    default n
+
+config RT_USING_POSIX_AIO
+    bool "Enable AIO APIs"
+    default n
+
+config RT_USING_PTHREADS
+    bool "Enable pthreads APIs"
+    default n
+
+if RT_USING_PTHREADS
+    config PTHREAD_NUM_MAX
+        int "Maximum number of pthreads"
+        default 8
+endif
+
+endmenu