6 files changed, 23 insertions, 15 deletions
diff --git a/components/libc/Kconfig b/components/libc/Kconfig
index d10c0afd6a..9b30357848 100644
--- a/components/libc/Kconfig
+++ b/components/libc/Kconfig
@@ -39,10 +39,13 @@ config RT_LIBC_DEFAULT_TIMEZONE
 config RT_USING_POSIX
     bool "Enable basic POSIX layer, open/read/write/close etc"
     select RT_USING_DFS
-    select RT_USING_DFS_DEVFS
     default n
 
 if RT_USING_POSIX
+    config RT_USING_POSIX_STDIO
+        bool "Enable standard IO"
+        select RT_USING_DFS_DEVFS
+        default n
 
     config RT_USING_POSIX_POLL
         bool "Enable poll()"
diff --git a/components/libc/compilers/armlibc/syscalls.c b/components/libc/compilers/armlibc/syscalls.c
index 755ffef1a6..62657a4b64 100644
--- a/components/libc/compilers/armlibc/syscalls.c
+++ b/components/libc/compilers/armlibc/syscalls.c
@@ -21,7 +21,7 @@
 #include <fcntl.h>
 #include <unistd.h>
 #include <sys/stat.h>
-#ifdef RT_USING_POSIX
+#ifdef RT_USING_POSIX_STDIO
 #include "libc.h"
 #endif
 
@@ -144,7 +144,7 @@ int _sys_close(FILEHANDLE fh)
  */
 int _sys_read(FILEHANDLE fh, unsigned char *buf, unsigned len, int mode)
 {
-#ifdef RT_USING_POSIX
+#ifdef RT_USING_POSIX_STDIO
     int size;
 
     if (fh == STDIN)
@@ -169,7 +169,7 @@ int _sys_read(FILEHANDLE fh, unsigned char *buf, unsigned len, int mode)
         return 0; /* error */
 #else
     return 0; /* error */
-#endif /* RT_USING_POSIX */
+#endif /* RT_USING_POSIX_STDIO */
 }
 
 /*
@@ -185,7 +185,7 @@ int _sys_write(FILEHANDLE fh, const unsigned char *buf, unsigned len, int mode)
 
     if ((fh == STDOUT) || (fh == STDERR))
     {
-#ifdef RT_USING_POSIX
+#ifdef RT_USING_POSIX_STDIO
         if (libc_stdio_get_console() < 0)
         {
             LOG_W("Do not invoke standard input before initializing libc");
@@ -200,7 +200,7 @@ int _sys_write(FILEHANDLE fh, const unsigned char *buf, unsigned len, int mode)
         }
 
         return 0; /* error */
-#endif /* RT_USING_POSIX */
+#endif /* RT_USING_POSIX_STDIO */
     }
     else if (fh == STDIN)
     {
@@ -325,7 +325,7 @@ int fputc(int c, FILE *f)
 
 int fgetc(FILE *f)
 {
-#ifdef RT_USING_POSIX
+#ifdef RT_USING_POSIX_STDIO
     char ch;
 
     if (libc_stdio_get_console() < 0)
@@ -336,7 +336,7 @@ int fgetc(FILE *f)
 
     if(read(STDIN_FILENO, &ch, 1) == 1)
         return ch;
-#endif /* RT_USING_POSIX */
+#endif /* RT_USING_POSIX_STDIO */
     return 0; /* error */
 }
 
diff --git a/components/libc/compilers/dlib/syscall_read.c b/components/libc/compilers/dlib/syscall_read.c
index 74cedb966a..c926c577b5 100644
--- a/components/libc/compilers/dlib/syscall_read.c
+++ b/components/libc/compilers/dlib/syscall_read.c
@@ -11,7 +11,7 @@
 #include <rtthread.h>
 #include <yfuns.h>
 #include <unistd.h>
-#ifdef RT_USING_POSIX
+#ifdef RT_USING_POSIX_STDIO
 #include "libc.h"
 #endif
 
@@ -22,7 +22,7 @@
 #pragma module_name = "?__read"
 size_t __read(int handle, unsigned char *buf, size_t len)
 {
-#ifdef RT_USING_POSIX
+#ifdef RT_USING_POSIX_STDIO
     int size;
 
     if (handle == _LLIO_STDIN)
diff --git a/components/libc/compilers/dlib/syscall_write.c b/components/libc/compilers/dlib/syscall_write.c
index ab011c1096..72bac6ba49 100644
--- a/components/libc/compilers/dlib/syscall_write.c
+++ b/components/libc/compilers/dlib/syscall_write.c
@@ -11,7 +11,7 @@
 #include <rtthread.h>
 #include <yfuns.h>
 #include <unistd.h>
-#ifdef RT_USING_POSIX
+#ifdef RT_USING_POSIX_STDIO
 #include "libc.h"
 #endif
 
@@ -29,7 +29,7 @@ size_t __write(int handle, const unsigned char *buf, size_t len)
 
     if ((handle == _LLIO_STDOUT) || (handle == _LLIO_STDERR))
     {
-#ifdef RT_USING_POSIX
+#ifdef RT_USING_POSIX_STDIO
         if (libc_stdio_get_console() < 0)
         {
             LOG_W("Do not invoke standard output before initializing libc");
diff --git a/components/libc/compilers/gcc/newlib/syscalls.c b/components/libc/compilers/gcc/newlib/syscalls.c
index f95e695a85..e957aaf003 100644
--- a/components/libc/compilers/gcc/newlib/syscalls.c
+++ b/components/libc/compilers/gcc/newlib/syscalls.c
@@ -20,7 +20,7 @@
 #include <unistd.h>
 #include <sys/errno.h>
 #include <sys/stat.h>
-#ifdef RT_USING_POSIX
+#ifdef RT_USING_POSIX_STDIO
 #include "libc.h"
 #endif
 #ifdef RT_USING_MODULE
@@ -216,7 +216,7 @@ int _open_r(struct _reent *ptr, const char *file, int flags, int mode)
 
 _ssize_t _read_r(struct _reent *ptr, int fd, void *buf, size_t nbytes)
 {
-#ifdef RT_USING_POSIX
+#ifdef RT_USING_POSIX_STDIO
     _ssize_t rc;
     if (libc_stdio_get_console() < 0 && fd == STDIN_FILENO)
     {
@@ -271,11 +271,13 @@ _ssize_t _write_r(struct _reent *ptr, int fd, const void *buf, size_t nbytes)
 {
 #ifdef RT_USING_POSIX
     _ssize_t rc;
+#ifdef RT_USING_POSIX_STDIO
     if (libc_stdio_get_console() < 0 && fd == STDOUT_FILENO)
     {
         LOG_W("Do not invoke standard output before initializing libc");
         return 0;
     }
+#endif /* RT_USING_POSIX_STDIO */
     rc = write(fd, buf, nbytes);
     return rc;
 #elif defined(RT_USING_CONSOLE)
diff --git a/components/libc/posix/src/SConscript b/components/libc/posix/src/SConscript
index 4c6d3e3b7b..24c4ede4e1 100644
--- a/components/libc/posix/src/SConscript
+++ b/components/libc/posix/src/SConscript
@@ -2,10 +2,13 @@
 
 from building import *
 
-src     = ['libc.c', 'unistd.c']
+src     = ['unistd.c']
 cwd     = GetCurrentDir()
 CPPPATH = [cwd]
 
+if GetDepend('RT_USING_POSIX_STDIO'):
+    src += ['libc.c']
+
 if GetDepend('RT_USING_POSIX_POLL'):
     src += ['poll.c']