[libc] remove RT_USING_LIBC

bsp/at32/at32f403a-start/board/Kconfig

@@ -31,7 +31,6 @@ menu "On-chip Peripheral Drivers"
     menuconfig BSP_USING_RTC
         bool "Enable RTC"
         select RT_USING_RTC
-        select RT_USING_LIBC
         default n
         if BSP_USING_RTC
             choice

bsp/at32/at32f407-start/board/Kconfig

@@ -37,7 +37,6 @@ menu "On-chip Peripheral Drivers"
     menuconfig BSP_USING_RTC
         bool "Enable RTC"
         select RT_USING_RTC
-        select RT_USING_LIBC
         default n
         if BSP_USING_RTC
             choice

bsp/bluetrum/ab32vg1-ab-prougen/board/Kconfig

@@ -204,7 +204,6 @@ menu "On-chip Peripheral Drivers"
     menuconfig BSP_USING_ONCHIP_RTC
         bool "Enable RTC"
         select RT_USING_RTC
-        select RT_USING_LIBC
         default n
         if BSP_USING_ONCHIP_RTC
             config RTC_USING_INTERNAL_CLK

bsp/gd32/docs/GD32系列BSP制作教程.md

@@ -918,7 +918,6 @@ GD32 BSP 的制作规范主要分为 3 个方面：工程配置，ENV 配置和
 - 系统空闲线程栈大小统一设置为 256（宏：IDLE_THREAD_STACK_SIZE）
 - 开启组件自动初始化（宏：RT_USING_COMPONENTS_INIT）
 - 需要开启 user main 选项（宏：RT_USING_USER_MAIN）
-- 默认关闭 libc（宏：RT_USING_LIBC）
 - FinSH 默认只使用 MSH 模式（宏：FINSH_USING_MSH_ONLY）
 
 #### 4.1.3 IDE 配置

bsp/hc32f4a0/board/Kconfig

@@ -219,7 +219,6 @@ menu "On-chip Peripheral Drivers"
     menuconfig BSP_USING_RTC
         bool "Enable RTC"
         select RT_USING_RTC
-        select RT_USING_LIBC
         default n
 
         if BSP_USING_RTC

bsp/hk32/hk32f030c8-mini/board/Kconfig

@@ -31,7 +31,6 @@ menu "On-chip Peripheral Drivers"
     menuconfig BSP_USING_RTC
         bool "Enable RTC"
         select RT_USING_RTC
-        select RT_USING_LIBC
         default n
         if BSP_USING_RTC
             choice

bsp/lpc55sxx/lpc55s69_nxp_evk/board/Kconfig

@@ -137,7 +137,6 @@ menu "On-chip Peripheral Drivers"
         select RT_USING_SDIO
         select RT_USING_DFS
         select RT_USING_DFS_ELMFAT
-        select RT_LIBC_USING_TIME
         default y
 
     config BSP_USING_RTC

bsp/maxim/MAX32660_EVSYS/board/Kconfig

@@ -84,7 +84,6 @@ menu "On-chip Peripheral Drivers"
      config BSP_USING_ONCHIP_RTC
          bool "Enable RTC"
          select RT_USING_RTC
-         select RT_USING_LIBC
          default n
         
 endmenu

bsp/nrf5x/nrf52832/board/Kconfig

@@ -390,7 +390,6 @@ menu "On-chip Peripheral Drivers"
     menuconfig BSP_USING_ONCHIP_RTC
     bool "Enable RTC"
     select RT_USING_RTC
-    select RT_USING_LIBC
     default n
     if BSP_USING_ONCHIP_RTC
         config NRFX_CLOCK_ENABLED

bsp/nrf5x/nrf52840/board/Kconfig

@@ -374,7 +374,6 @@ menu "On-chip Peripheral Drivers"
     menuconfig BSP_USING_ONCHIP_RTC
     bool "Enable RTC"
     select RT_USING_RTC
-    select RT_USING_LIBC
     default n
 
 

bsp/stm32/docs/How to make a STM32 BSP for RT-Thread.md

@@ -221,7 +221,6 @@ The specifications of making STM32 BSP are mainly divided into three aspects: en
 - The system idle thread stack size is uniformly set to 256 (Macro: IDLE_THREAD_STACK_SIZE) 
 - Turn on automatic component initialization (Macro: RT_USING_COMPONENTS_INIT) 
 - Need to enable the user main option (Macro: RT_USING_USER_MAIN) 
-- Disable libc by default (Macro: RT_USING_LIBC) 
 - FinSH only uses MSH mode by default (Macro: FINSH_USING_MSH_ONLY) 
 
 #### 4.1.3 IDE configuration

bsp/stm32/docs/STM32系列BSP制作教程.md

@@ -269,7 +269,6 @@ STM32 BSP 的制作规范主要分为 3 个方面：工程配置，ENV 配置和
 - 系统空闲线程栈大小统一设置为 256（宏：IDLE_THREAD_STACK_SIZE）
 - 开启组件自动初始化（宏：RT_USING_COMPONENTS_INIT）
 - 需要开启 user main 选项（宏：RT_USING_USER_MAIN）
-- 默认关闭 libc（宏：RT_USING_LIBC）
 - FinSH 默认只使用 MSH 模式（宏：FINSH_USING_MSH_ONLY）
 
 #### 4.1.3 IDE 配置

bsp/stm32/libraries/templates/stm32l1xx/board/Kconfig

@@ -187,7 +187,6 @@ menu "On-chip Peripheral Drivers"
     menuconfig BSP_USING_ONCHIP_RTC
         bool "Enable RTC"
         select RT_USING_RTC
-        select RT_USING_LIBC
         default n
         if BSP_USING_ONCHIP_RTC
             choice

bsp/stm32/libraries/templates/stm32wbxx/board/Kconfig

@@ -143,7 +143,6 @@ menu "On-chip Peripheral Drivers"
     menuconfig BSP_USING_ONCHIP_RTC
         bool "Enable RTC"
         select RT_USING_RTC
-        select RT_USING_LIBC
         default n
         if BSP_USING_ONCHIP_RTC
             choice

bsp/stm32/libraries/templates/stm32xx_board_Kconfig

@@ -151,7 +151,6 @@ menu "On-chip Peripheral Drivers"
     menuconfig BSP_USING_ONCHIP_RTC
         bool "Enable RTC"
         select RT_USING_RTC
-        select RT_USING_LIBC
         default n
         if BSP_USING_ONCHIP_RTC
             choice

bsp/stm32/stm32f407-armfly-v5/board/Kconfig

@@ -162,7 +162,6 @@ menu "On-chip Peripheral Drivers"
     menuconfig BSP_USING_ONCHIP_RTC
         bool "Enable RTC"
         select RT_USING_RTC
-        select RT_USING_LIBC
         default n
         if BSP_USING_ONCHIP_RTC
             choice

bsp/stm32/stm32f746-st-nucleo/board/Kconfig

@@ -193,7 +193,6 @@ menu "On-chip Peripheral Drivers"
     menuconfig BSP_USING_ONCHIP_RTC
         bool "Enable RTC"
         select RT_USING_RTC
-        select RT_USING_LIBC
         default n
         if BSP_USING_ONCHIP_RTC
             choice

bsp/stm32/stm32l475-atk-pandora/board/Kconfig

@@ -148,7 +148,6 @@ menu "Onboard Peripheral Drivers"
             select RT_USING_WIFI
             select RT_WLAN_PROT_LWIP_PBUF_FORCE
             select RT_USING_LWIP
-            select RT_USING_LIBC
             select RT_USING_DFS
             select DFS_USING_POSIX
             select PKG_USING_FAL

bsp/swm320-lq100/drivers/Kconfig

@@ -236,7 +236,6 @@ menu "On-chip Peripheral Drivers"
     config BSP_USING_RTC
         bool "Enable RTC"
         select RT_USING_RTC
-        select RT_USING_LIBC
         default n
 
     menuconfig BSP_USING_SPI

bsp/swm320/drivers/Kconfig

@@ -236,7 +236,6 @@ menu "On-chip Peripheral Drivers"
     config BSP_USING_RTC
         bool "Enable RTC"
         select RT_USING_RTC
-        select RT_USING_LIBC
         default n
 
     menuconfig BSP_USING_SPI

bsp/tae32f5300/drivers/Kconfig

@@ -167,7 +167,6 @@ menu "On-chip Peripheral Drivers"
     menuconfig BSP_USING_RTC
         bool "Enable RTC"
         select RT_USING_RTC
-        select RT_USING_LIBC
         default n
 
         if BSP_USING_RTC

bsp/tm4c123bsp/board/Kconfig

@@ -283,7 +283,6 @@ menu "On-chip Peripheral Drivers"
     menuconfig BSP_USING_ONCHIP_RTC
         bool "Enable RTC"
         select RT_USING_RTC
-        select RT_USING_LIBC
         default n
         if BSP_USING_ONCHIP_RTC
             choice

components/cplusplus/Kconfig

@@ -9,8 +9,8 @@ if RT_USING_CPLUSPLUS
     config RT_USING_CPLUSPLUS11
         bool "Enable c++11 threading feature support"
         default n
-        select RT_USING_LIBC
-        select RT_LIBC_USING_FILEIO
+        select RT_USING_POSIX_FS
+        select RT_USING_POSIX_DEVIO
         select RT_USING_PTHREADS
         select RT_USING_RTC
 

components/cplusplus/README.md

@@ -11,8 +11,6 @@ Because RT-Thread RTOS is used in embedded system mostly, there are some rules f
 4. Static class variables are discouraged. The time and place to call their constructor function could not be precisely controlled and make multi-threaded programming a nightmare.
 5. Multiple inheritance is strongly discouraged, as it can cause intolerable confusion.
 
-*NOTE*: The libc (RT_USING_LIBC in rtconfig.h) must be enable.
-
 About GNU GCC compiler
 
 please add following string in your ld link script:

components/cplusplus/cpp11/armclang/thread.cpp

@@ -95,8 +95,8 @@ extern "C" unsigned __ARM_TPL_thread_hw_concurrency()
 extern "C" int __ARM_TPL_tls_create(__ARM_TPL_tls_key *__key,
                                     void (*__at_exit)(void *))
 {
-    pthread_key_t key; 
-    
+    pthread_key_t key;
+
     if (pthread_key_create(&key, __at_exit) == 0)
     {
         *__key = key;

components/cplusplus/cpp11/gcc/mutex

@@ -4,7 +4,7 @@
 #error "C++ version lower than C++11"
 #endif
 
-//#if defined(RT_USING_LIBC) && defined(RT_USING_PTHREADS)
+//#if defined(RT_USING_PTHREADS)
 
 #include <pthread.h>
 
@@ -509,4 +509,4 @@ namespace std
     }
 }
 
-//#endif // (RT_USING_LIBC) && (RT_USING_PTHREADS)
+//#endif //(RT_USING_PTHREADS)

components/cplusplus/cpp11/gcc/mutex.cpp

@@ -34,7 +34,7 @@ namespace std
         get_once_functor_lock_ptr() = m_ptr;
     }
 
-    extern "C"  
+    extern "C"
     {
         void once_proxy()
         {
@@ -42,7 +42,7 @@ namespace std
             function<void()> once_call = std::move(once_functor);
 
             // no need to hold the lock anymore
-            unique_lock<mutex>* lock_ptr = get_once_functor_lock_ptr();            
+            unique_lock<mutex>* lock_ptr = get_once_functor_lock_ptr();
             get_once_functor_lock_ptr() = nullptr;
             lock_ptr->unlock();
 

components/cplusplus/cpp11/gcc/thread

@@ -4,7 +4,7 @@
 #error "C++ version lower than C++11"
 #endif
 
-//#if defined(RT_USING_LIBC) && defined(RT_USING_PTHREADS)
+//#if defined(RT_USING_PTHREADS)
 
 #include <unistd.h>
 #include <pthread.h>

components/cplusplus/cpp11/gcc/thread.cpp

@@ -35,17 +35,17 @@ namespace std
     {
         auto raw_ptr = b.get();
         // transfer the ownership of the invoker to the new thread
-        raw_ptr->this_ptr = std::move(b); 
+        raw_ptr->this_ptr = std::move(b);
         int err = pthread_create(&_m_thr.__cpp_thread_t, NULL,
                 &execute_native_thread_routine, raw_ptr);
 
-        if (err) 
+        if (err)
         {
             raw_ptr->this_ptr.reset();
             throw_system_error(err, "Failed to create a thread");
         }
-        
-    }    
+
+    }
 
     thread::~thread()
     {
@@ -59,12 +59,12 @@ namespace std
 
         if (joinable())
             err = pthread_join(native_handle(), NULL);
-        
-        if (err) 
+
+        if (err)
         {
             throw_system_error(err, "thread::join failed");
         }
-    
+
         _m_thr = id();
     }
 
@@ -78,14 +78,14 @@ namespace std
         {
             throw_system_error(err, "thread::detach failed");
         }
-    
+
         _m_thr = id();
     }
 
     // TODO: not yet actually implemented.
     // The standard states that the returned value should only be considered a hint.
-    unsigned thread::hardware_concurrency() noexcept 
-    {   
+    unsigned thread::hardware_concurrency() noexcept
+    {
         int __n = _RT_NPROCS;
         if (__n < 0)
             __n = 0;

components/dfs/filesystems/elmfat/dfs_elm.c

@@ -945,7 +945,6 @@ DWORD get_fattime(void)
 {
     DWORD fat_time = 0;
 
-#if defined(RT_LIBC_USING_TIME) || defined(RT_USING_LIBC)
     time_t now;
     struct tm *p_tm;
     struct tm tm_now;
@@ -968,7 +967,6 @@ DWORD get_fattime(void)
                (DWORD)tm_now.tm_hour        << 11 |
                (DWORD)tm_now.tm_min         <<  5 |
                (DWORD)tm_now.tm_sec / 2 ;
-#endif /* defined(RT_LIBC_USING_TIME) || defined(RT_USING_LIBC) */
 
     return fat_time;
 }

components/libc/Kconfig

@@ -1,38 +1,16 @@
 menu "POSIX layer and C standard library"
 
-config RT_USING_LIBC
-    bool "Enable libc APIs from the toolchain"
+config RT_USING_MODULE
+    bool "Enable dynamic module with dlopen/dlsym/dlclose feature"
     default n
 
-if RT_USING_LIBC
-    config RT_LIBC_USING_TIME
-        default y
-
-    config RT_LIBC_USING_FILEIO
-        bool "Enable libc with file operation, eg.fopen/fwrite/fread/getchar/STDIO"
-        select RT_USING_POSIX_FS
-        select RT_USING_POSIX_DEVIO
-        default n
-
-    config RT_USING_MODULE
-        bool "Enable dynamic module with dlopen/dlsym/dlclose feature"
+if RT_USING_MODULE
+    config RT_USING_CUSTOM_DLMODULE
+        bool "Enable load dynamic module by custom"
         default n
-
-    if RT_USING_MODULE
-        config RT_USING_CUSTOM_DLMODULE
-            bool "Enable load dynamic module by custom"
-            default n
-    endif
-endif
-
-if RT_USING_LIBC != y
-    config RT_LIBC_USING_TIME
-    bool "Enable time functions without compiler's libc"
-    default y
 endif
 
 config RT_LIBC_DEFAULT_TIMEZONE
-    depends on (RT_LIBC_USING_TIME || RT_USING_LIBC)
     int "Set the default time zone (UTC+)"
     range -12 12
     default 8

components/libc/compilers/armlibc/README.md

@@ -1,9 +1,3 @@
 # ARMLIB (Keil-MDK) porting for RT-Thread
 
-Please define RT_USING_LIBC and compile RT-Thread with Keil-MDK compiler.
-
-
-
-## More Information
-
 https://www.keil.com/support/man/docs/armlib/

components/libc/compilers/armlibc/SConscript

@@ -7,6 +7,6 @@ group = []
 CPPDEFINES = ['RT_USING_ARM_LIBC']
 
 if rtconfig.PLATFORM == 'armcc' or rtconfig.PLATFORM == 'armclang':
-    group = DefineGroup('libc', src, depend = ['RT_USING_LIBC'], CPPDEFINES = CPPDEFINES)
+    group = DefineGroup('compiler-libc', src, depend = [], CPPDEFINES = CPPDEFINES)
 
 Return('group')

components/libc/compilers/armlibc/mem_std.c → components/libc/compilers/armlibc/syscall_mem.c

@@ -13,7 +13,7 @@
 #include <stddef.h>
 
 #ifndef RT_USING_HEAP
-#define DBG_TAG    "armlibc.mem"
+#define DBG_TAG    "armlibc.syscall.mem"
 #define DBG_LVL    DBG_INFO
 #include <rtdbg.h>
 

components/libc/compilers/armlibc/syscalls.c

@@ -21,6 +21,7 @@
 #include <fcntl.h>
 #include <unistd.h>
 #include <sys/stat.h>
+#include <compiler_private.h>
 #ifdef RT_USING_POSIX_DEVIO
 #include "libc.h"
 #endif /* RT_USING_POSIX_DEVIO */
@@ -69,6 +70,7 @@ FILEHANDLE _sys_open(const char *name, int openmode)
         return (STDERR);
 
 #ifndef DFS_USING_POSIX
+    LOG_W("%s: %s", __func__, warning_without_fs);
     return 0; /* error */
 #else
     /* Correct openmode from fopen to open */
@@ -113,6 +115,7 @@ int _sys_close(FILEHANDLE fh)
 
     return close(fh);
 #else
+    LOG_W("%s: %s", __func__, warning_without_fs);
     return 0;
 #endif /* DFS_USING_POSIX */
 }
@@ -152,12 +155,13 @@ int _sys_read(FILEHANDLE fh, unsigned char *buf, unsigned len, int mode)
 #ifdef RT_USING_POSIX_DEVIO
         if (libc_stdio_get_console() < 0)
         {
-            LOG_W("Do not invoke standard output before initializing libc");
+            LOG_W("Do not invoke standard output before initializing compiler-libc");
             return 0; /* error, but keep going */
         }
         size = read(STDIN_FILENO, buf, len);
         return len - size; /* success */
 #else
+        LOG_W("%s: %s", __func__, warning_without_devio);
         return 0; /* error */
 #endif /* RT_USING_POSIX_DEVIO */
     }
@@ -178,6 +182,7 @@ int _sys_read(FILEHANDLE fh, unsigned char *buf, unsigned len, int mode)
         }
     }
 #else
+    LOG_W("%s: %s", __func__, warning_without_fs);
     return 0; /* error */
 #endif /* DFS_USING_POSIX */
 }
@@ -228,6 +233,7 @@ int _sys_write(FILEHANDLE fh, const unsigned char *buf, unsigned len, int mode)
             return 0; /* error */
         }
 #else
+        LOG_W("%s: %s", __func__, warning_without_fs);
         return 0; /* error */
 #endif /* DFS_USING_POSIX */
     }
@@ -246,6 +252,7 @@ int _sys_seek(FILEHANDLE fh, long pos)
     /* position is relative to the start of file fh */
     return lseek(fh, pos, 0);
 #else
+    LOG_W("%s: %s", __func__, warning_without_fs);
     return 0; /* error */
 #endif /* DFS_USING_POSIX */
 }
@@ -301,6 +308,7 @@ long _sys_flen(FILEHANDLE fh)
     fstat(fh, &stat);
     return stat.st_size;
 #else
+    LOG_W("%s: %s", __func__, warning_without_fs);
     return 0;
 #endif /* DFS_USING_POSIX */
 }
@@ -318,6 +326,7 @@ int remove(const char *filename)
 #ifdef DFS_USING_POSIX
     return unlink(filename);
 #else
+    LOG_W("%s: %s", __func__, warning_without_fs);
     return 0; /* error */
 #endif /* DFS_USING_POSIX */
 }
@@ -345,13 +354,14 @@ int fgetc(FILE *f)
 
     if (libc_stdio_get_console() < 0)
     {
-        LOG_W("Do not invoke standard output before initializing libc");
+        LOG_W("Do not invoke standard output before initializing compiler-libc");
         return 0;
     }
 
     if(read(STDIN_FILENO, &ch, 1) == 1)
         return ch;
 #endif /* RT_USING_POSIX_DEVIO */
+    LOG_W("%s: %s", __func__, warning_without_devio);
     return 0; /* error */
 }
 

components/libc/compilers/common/SConscript

@@ -10,12 +10,9 @@ CPPDEFINES = []
 if rtconfig.CROSS_TOOL == 'keil':
     CPPDEFINES += ['__CLK_TCK=RT_TICK_PER_SECOND']
 
-if GetDepend('RT_USING_LIBC'):
-    src += Glob('*.c')
-elif GetDepend('RT_LIBC_USING_TIME'):
-    src += ['time.c']
+src += Glob('*.c')
 
-group = DefineGroup('libc', src, depend = [], CPPPATH = CPPPATH, CPPDEFINES = CPPDEFINES)
+group = DefineGroup('compiler-libc', src, depend = [], CPPPATH = CPPPATH, CPPDEFINES = CPPDEFINES)
 
 list = os.listdir(cwd)
 for item in list:

components/libc/compilers/common/compiler_private.c

@@ -0,0 +1,13 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2021-12-26     Meco Man     First Version
+ */
+#include "compiler_private.h"
+
+const char *warning_without_fs = "Please enable RT_USING_POSIX_FS";
+const char *warning_without_devio = "Please enable RT_USING_POSIX_FS and RT_USING_POSIX_DEVIO";

components/libc/compilers/common/compiler_private.h

@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2021-12-26     Meco Man     First Version
+ */
+#ifndef __COMPILER_PRIVATE_H__
+#define __COMPILER_PRIVATE_H__
+
+#include <rtconfig.h>
+
+extern const char *warning_without_fs;
+extern const char *warning_without_devio;
+
+#endif /* __COMPILER_PRIVATE_H__ */

components/libc/compilers/common/nogcc/SConscript

@@ -7,9 +7,8 @@ cwd   = GetCurrentDir()
 CPPPATH = [cwd]
 group = []
 
-if GetDepend('RT_USING_LIBC'):
-    src += Glob('*.c')
+src += Glob('*.c')
 
 if rtconfig.PLATFORM != 'gcc' or rtconfig.ARCH == 'sim':
-    group = DefineGroup('libc', src, depend = [], CPPPATH = CPPPATH)
+    group = DefineGroup('compiler-libc', src, depend = [], CPPPATH = CPPPATH)
 Return('group')

components/libc/compilers/common/time.c

@@ -25,7 +25,7 @@
 #include <sys/errno.h>
 #include <rtthread.h>
 #include <rthw.h>
-#ifdef RT_USING_DEVICE
+#ifdef RT_USING_RTC
 #include <rtdevice.h>
 #endif
 
@@ -33,6 +33,8 @@
 #define DBG_LVL    DBG_INFO
 #include <rtdbg.h>
 
+#define WARNING_NO_RTC "Cannot find a RTC device!"
+
 /* seconds per day */
 #define SPD 24*60*60
 
@@ -108,7 +110,7 @@ static rt_err_t get_timeval(struct timeval *tv)
     else
     {
         /* LOG_W will cause a recursive printing if ulog timestamp function is enabled */
-        rt_kprintf("Cannot find a RTC device to provide time!\r\n");
+        rt_kprintf(WARNING_NO_RTC);
         return -RT_ENOSYS;
     }
 
@@ -116,7 +118,7 @@ static rt_err_t get_timeval(struct timeval *tv)
 
 #else
     /* LOG_W will cause a recursive printing if ulog timestamp function is enabled */
-    rt_kprintf("Cannot find a RTC device to provide time!\r\n");
+    rt_kprintf(WARNING_NO_RTC);
     return -RT_ENOSYS;
 #endif /* RT_USING_RTC */
 }
@@ -153,14 +155,14 @@ static int set_timeval(struct timeval *tv)
     }
     else
     {
-        LOG_W("Cannot find a RTC device to provide time!");
+        LOG_W(WARNING_NO_RTC);
         return -RT_ENOSYS;
     }
 
     return rst;
 
 #else
-    LOG_W("Cannot find a RTC device to provide time!");
+    LOG_W(WARNING_NO_RTC);
     return -RT_ENOSYS;
 #endif /* RT_USING_RTC */
 }
@@ -525,7 +527,7 @@ INIT_COMPONENT_EXPORT(_rt_clock_time_system_init);
 int clock_getres(clockid_t clockid, struct timespec *res)
 {
 #ifndef RT_USING_RTC
-    LOG_W("Cannot find a RTC device to save time!");
+    LOG_W(WARNING_NO_RTC);
     return -1;
 #else
     int ret = 0;
@@ -564,7 +566,7 @@ RTM_EXPORT(clock_getres);
 int clock_gettime(clockid_t clockid, struct timespec *tp)
 {
 #ifndef RT_USING_RTC
-    LOG_W("Cannot find a RTC device to save time!");
+    LOG_W(WARNING_NO_RTC);
     return -1;
 #else
     int ret = 0;
@@ -628,7 +630,7 @@ int clock_nanosleep(clockid_t clockid, int flags, const struct timespec *rqtp, s
 int clock_settime(clockid_t clockid, const struct timespec *tp)
 {
 #ifndef RT_USING_RTC
-    LOG_W("Cannot find a RTC device to save time!");
+    LOG_W(WARNING_NO_RTC);
     return -1;
 #else
     register rt_base_t level;

components/libc/compilers/dlib/README.md

@@ -1,9 +1,3 @@
 # DLIB (IAR) porting for RT-Thread
 
-Please define RT_USING_LIBC and compile RT-Thread with IAR compiler.
-
-
-
-## More Information
-
 http://www.iarsys.co.jp/download/LMS2/arm/7502/ewarm7502doc/arm/doc/EWARM_DevelopmentGuide.ENU.pdf    P.130

components/libc/compilers/dlib/SConscript

@@ -15,6 +15,6 @@ if rtconfig.PLATFORM == 'iar':
         if LooseVersion(IARVersion()) < LooseVersion("8.20.1"):
             CPPDEFINES = CPPDEFINES + ['_DLIB_THREAD_SUPPORT']
 
-    group = DefineGroup('libc', src, depend = ['RT_USING_LIBC'], CPPDEFINES = CPPDEFINES)
+    group = DefineGroup('compiler-libc', src, depend = [], CPPDEFINES = CPPDEFINES)
 
 Return('group')

components/libc/compilers/dlib/syscall_close.c

@@ -10,6 +10,10 @@
 #include <rtthread.h>
 #include <LowLevelIOInterface.h>
 #include <unistd.h>
+#include <compiler_private.h>
+#define DBG_TAG    "dlib.syscall.close"
+#define DBG_LVL    DBG_INFO
+#include <rtdbg.h>
 
 /*
  * The "__close" function should close the file corresponding to
@@ -27,6 +31,7 @@ int __close(int handle)
 #ifdef DFS_USING_POSIX
     return close(handle);
 #else
+    LOG_W(warning_without_fs);
     return _LLIO_ERROR;
 #endif /* DFS_USING_POSIX */
 }

components/libc/compilers/dlib/syscall_lseek.c

@@ -10,6 +10,10 @@
 #include <rtthread.h>
 #include <LowLevelIOInterface.h>
 #include <unistd.h>
+#include <compiler_private.h>
+#define DBG_TAG    "dlib.syscall.lseek"
+#define DBG_LVL    DBG_INFO
+#include <rtdbg.h>
 
 /*
  * The "__lseek" function makes the next file operation (__read or
@@ -36,6 +40,7 @@ long __lseek(int handle, long offset, int whence)
 #ifdef DFS_USING_POSIX
     return lseek(handle, offset, whence);
 #else
+    LOG_W(warning_without_fs);
     return _LLIO_ERROR;
 #endif /* DFS_USING_POSIX */
 }

components/libc/compilers/dlib/syscall_mem.c

@@ -12,7 +12,7 @@
 #include <stddef.h>
 
 #ifndef RT_USING_HEAP
-#define DBG_TAG    "dlib.syscall_mem"
+#define DBG_TAG    "dlib.syscall.mem"
 #define DBG_LVL    DBG_INFO
 #include <rtdbg.h>
 #define _NO_HEAP_ERROR()  do{LOG_E("Please enable RT_USING_HEAP");\

components/libc/compilers/dlib/syscall_open.c

@@ -11,6 +11,10 @@
 #include <rtthread.h>
 #include <LowLevelIOInterface.h>
 #include <fcntl.h>
+#include <compiler_private.h>
+#define DBG_TAG    "dlib.syscall.open"
+#define DBG_LVL    DBG_INFO
+#include <rtdbg.h>
 
 /*
  * The "__open" function opens the file named "filename" as specified
@@ -22,56 +26,58 @@
 int __open(const char *filename, int mode)
 {
 #ifdef DFS_USING_POSIX
-  int handle;
-  int open_mode = O_RDONLY;
+    int handle;
+    int open_mode = O_RDONLY;
 
-  if (mode & _LLIO_CREAT)
-  {
-    open_mode |= O_CREAT;
-
-    /* Check what we should do with it if it exists. */
-    if (mode & _LLIO_APPEND)
+    if (mode & _LLIO_CREAT)
     {
-      /* Append to the existing file. */
-      open_mode |= O_APPEND;
+        open_mode |= O_CREAT;
+
+        /* Check what we should do with it if it exists. */
+        if (mode & _LLIO_APPEND)
+        {
+            /* Append to the existing file. */
+            open_mode |= O_APPEND;
+        }
+
+        if (mode & _LLIO_TRUNC)
+        {
+            /* Truncate the existsing file. */
+            open_mode |= O_TRUNC;
+        }
     }
 
-    if (mode & _LLIO_TRUNC)
+    if (mode & _LLIO_TEXT)
     {
-      /* Truncate the existsing file. */
-      open_mode |= O_TRUNC;
+        /* we didn't support text mode */
     }
-  }
 
-  if (mode & _LLIO_TEXT)
-  {
-    /* we didn't support text mode */
-  }
-
-  switch (mode & _LLIO_RDWRMASK)
-  {
-  case _LLIO_RDONLY:
-    break;
-
-  case _LLIO_WRONLY:
-    open_mode |= O_WRONLY;
-    break;
+    switch (mode & _LLIO_RDWRMASK)
+    {
+    case _LLIO_RDONLY:
+        break;
 
-  case _LLIO_RDWR:
-    /* The file should be opened for both reads and writes. */
-    open_mode |= O_RDWR;
-    break;
+    case _LLIO_WRONLY:
+        open_mode |= O_WRONLY;
+        break;
 
-  default:
-    return _LLIO_ERROR;
-  }
+    case _LLIO_RDWR:
+        /* The file should be opened for both reads and writes. */
+        open_mode |= O_RDWR;
+        break;
 
-  handle = open(filename, open_mode, 0);
-  if (handle < 0)
-    return _LLIO_ERROR;
+    default:
+        return _LLIO_ERROR;
+    }
 
-  return handle;
+    handle = open(filename, open_mode, 0);
+    if (handle < 0)
+    {
+        return _LLIO_ERROR;
+    }
+    return handle;
 #else
-  return _LLIO_ERROR;
+    LOG_W(warning_without_fs);
+    return _LLIO_ERROR;
 #endif /* DFS_USING_POSIX */
 }

components/libc/compilers/dlib/syscall_read.c

@@ -14,8 +14,8 @@
 #ifdef RT_USING_POSIX_DEVIO
 #include "libc.h"
 #endif /* RT_USING_POSIX_DEVIO */
-
-#define DBG_TAG    "dlib.syscall_read"
+#include <compiler_private.h>
+#define DBG_TAG    "dlib.syscall.read"
 #define DBG_LVL    DBG_INFO
 #include <rtdbg.h>
 
@@ -42,11 +42,12 @@ size_t __read(int handle, unsigned char *buf, size_t len)
 #ifdef RT_USING_POSIX_DEVIO
         if (libc_stdio_get_console() < 0)
         {
-            LOG_W("Do not invoke standard input before initializing libc");
+            LOG_W("Do not invoke standard input before initializing compiler-libc");
             return 0; /* error, but keep going */
         }
         return read(STDIN_FILENO, buf, len); /* return the length of the data read */
 #else
+        LOG_W(warning_without_devio);
         return _LLIO_ERROR;
 #endif /* RT_USING_POSIX_DEVIO */
     }
@@ -58,6 +59,7 @@ size_t __read(int handle, unsigned char *buf, size_t len)
     size = read(handle, buf, len);
     return size; /* return the length of the data read */
 #else
+    LOG_W(warning_without_fs);
     return _LLIO_ERROR;
 #endif /* DFS_USING_POSIX */
 }

components/libc/compilers/dlib/syscall_remove.c

@@ -10,6 +10,10 @@
 #include <rtthread.h>
 #include <LowLevelIOInterface.h>
 #include <unistd.h>
+#include <compiler_private.h>
+#define DBG_TAG    "dlib.syscall.remove"
+#define DBG_LVL    DBG_INFO
+#include <rtdbg.h>
 
 /*
  * The "remove" function should remove the file named "filename".  It
@@ -23,6 +27,7 @@ int remove(const char *filename)
 #ifdef DFS_USING_POSIX
     return unlink(filename);
 #else
+    LOG_W(warning_without_fs);
     return _LLIO_ERROR;
 #endif /* DFS_USING_POSIX */
 }

components/libc/compilers/dlib/syscall_write.c

@@ -11,7 +11,8 @@
 #include <rtthread.h>
 #include <LowLevelIOInterface.h>
 #include <unistd.h>
-#define DBG_TAG    "dlib.syscall_write"
+#include <compiler_private.h>
+#define DBG_TAG    "dlib.syscall.write"
 #define DBG_LVL    DBG_INFO
 #include <rtdbg.h>
 
@@ -63,6 +64,7 @@ size_t __write(int handle, const unsigned char *buf, size_t len)
         size = write(handle, buf, len);
         return size; /* return the length of the data written */
 #else
+        LOG_W(warning_without_fs);
         return _LLIO_ERROR;
 #endif /* DFS_USING_POSIX */
     }

components/libc/compilers/gcc/newlib/README.md

@@ -1,10 +1,4 @@
 # NEWLIB (GCC) porting for RT-Thread
 
-Please define RT_USING_LIBC and compile RT-Thread with GCC compiler.
-
-
-
-## More Information
-
 https://sourceware.org/newlib/libc.html#Reentrancy
 

components/libc/compilers/gcc/newlib/SConscript

@@ -10,11 +10,8 @@ LIBS = ['m'] # link libm
 CPPPATH = [cwd]
 
 if rtconfig.PLATFORM == 'gcc':
-    if GetDepend('RT_USING_LIBC'):
-        LIBS += ['c'] # link libc
-        src += Glob('*.c')
-    else:
-        src += ['syscalls.c']
+    LIBS += ['c'] # link libc
+    src += Glob('*.c')
 
     #report newlib version
     print('Newlib version:' + GetNewLibVersion(rtconfig))
@@ -22,7 +19,7 @@ if rtconfig.PLATFORM == 'gcc':
     # identify this is Newlib, and only enable POSIX.1-1990
     CPPDEFINES = ['RT_USING_NEWLIB', '_POSIX_C_SOURCE=1']
 
-    group = DefineGroup('libc', src, depend = [], CPPPATH = CPPPATH, CPPDEFINES = CPPDEFINES, LIBS = LIBS)
+    group = DefineGroup('compiler-libc', src, depend = [], CPPPATH = CPPPATH, CPPDEFINES = CPPDEFINES, LIBS = LIBS)
 
 
 list = os.listdir(cwd)

components/libc/compilers/gcc/newlib/syscalls.c

@@ -26,7 +26,7 @@
 #ifdef RT_USING_MODULE
 #include <dlmodule.h>
 #endif /* RT_USING_MODULE */
-
+#include <compiler_private.h>
 #define DBG_TAG    "newlib.syscalls"
 #define DBG_LVL    DBG_INFO
 #include <rtdbg.h>
@@ -92,8 +92,6 @@ void __libc_init_array(void)
     /* __libc_init_array is ARM code, not Thumb; it will cause a hardfault. */
 }
 
-#ifdef RT_USING_LIBC
-
 /* Reentrant versions of system calls.  */
 #ifndef _REENT_ONLY
 int *__errno ()
@@ -112,6 +110,7 @@ int _close_r(struct _reent *ptr, int fd)
 #ifdef DFS_USING_POSIX
     return close(fd);
 #else
+    LOG_W("%s: %s", __func__, warning_without_fs);
     ptr->_errno = ENOTSUP;
     return -1;
 #endif /* DFS_USING_POSIX */
@@ -185,10 +184,10 @@ _off_t _lseek_r(struct _reent *ptr, int fd, _off_t pos, int whence)
 {
 #ifdef DFS_USING_POSIX
     _off_t rc;
-
     rc = lseek(fd, pos, whence);
     return rc;
 #else
+    LOG_W("%s: %s", __func__, warning_without_fs);
     ptr->_errno = ENOTSUP;
     return -1;
 #endif /* DFS_USING_POSIX */
@@ -198,10 +197,10 @@ int _mkdir_r(struct _reent *ptr, const char *name, int mode)
 {
 #ifdef DFS_USING_POSIX
     int rc;
-
     rc = mkdir(name, mode);
     return rc;
 #else
+    LOG_W("%s: %s", __func__, warning_without_fs);
     ptr->_errno = ENOTSUP;
     return -1;
 #endif /* DFS_USING_POSIX */
@@ -214,6 +213,7 @@ int _open_r(struct _reent *ptr, const char *file, int flags, int mode)
     rc = open(file, flags, mode);
     return rc;
 #else
+    LOG_W("%s: %s", __func__, warning_without_fs);
     ptr->_errno = ENOTSUP;
     return -1;
 #endif /* DFS_USING_POSIX */
@@ -228,10 +228,11 @@ _ssize_t _read_r(struct _reent *ptr, int fd, void *buf, size_t nbytes)
 #ifdef RT_USING_POSIX_DEVIO
         if (libc_stdio_get_console() < 0)
         {
-            LOG_W("Do not invoke standard input before initializing libc");
+            LOG_W("Do not invoke standard input before initializing compiler-libc");
             return 0;
         }
 #else
+        LOG_W("%s: %s", __func__, warning_without_devio);
         ptr->_errno = ENOTSUP;
         return -1;
 #endif /* RT_USING_POSIX_DEVIO */
@@ -245,6 +246,7 @@ _ssize_t _read_r(struct _reent *ptr, int fd, void *buf, size_t nbytes)
     rc = read(fd, buf, nbytes);
     return rc;
 #else
+    LOG_W("%s: %s", __func__, warning_without_fs);
     ptr->_errno = ENOTSUP;
     return -1;
 #endif /* DFS_USING_POSIX */
@@ -254,10 +256,10 @@ int _rename_r(struct _reent *ptr, const char *old, const char *new)
 {
 #ifdef DFS_USING_POSIX
     int rc;
-
     rc = rename(old, new);
     return rc;
 #else
+    LOG_W("%s: %s", __func__, warning_without_fs);
     ptr->_errno = ENOTSUP;
     return -1;
 #endif /* DFS_USING_POSIX */
@@ -267,10 +269,10 @@ int _stat_r(struct _reent *ptr, const char *file, struct stat *pstat)
 {
 #ifdef DFS_USING_POSIX
     int rc;
-
     rc = stat(file, pstat);
     return rc;
 #else
+    LOG_W("%s: %s", __func__, warning_without_fs);
     ptr->_errno = ENOTSUP;
     return -1;
 #endif /* DFS_USING_POSIX */
@@ -281,6 +283,7 @@ int _unlink_r(struct _reent *ptr, const char *file)
 #ifdef DFS_USING_POSIX
     return unlink(file);
 #else
+    LOG_W("%s: %s", __func__, warning_without_fs);
     ptr->_errno = ENOTSUP;
     return -1;
 #endif /* DFS_USING_POSIX */
@@ -315,6 +318,7 @@ _ssize_t _write_r(struct _reent *ptr, int fd, const void *buf, size_t nbytes)
     rc = write(fd, buf, nbytes);
     return rc;
 #else
+    LOG_W("%s: %s", __func__, warning_without_fs);
     ptr->_errno = ENOTSUP;
     return -1;
 #endif /* DFS_USING_POSIX */
@@ -333,5 +337,3 @@ These functions are implemented and replaced by the 'common/time.c' file
 int _gettimeofday_r(struct _reent *ptr, struct timeval *__tp, void *__tzp);
 _CLOCK_T_  _times_r(struct _reent *ptr, struct tms *ptms);
 */
-
-#endif /* RT_USING_LIBC */

components/libc/libdl/arch/riscv.c

@@ -1,12 +1,12 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
- * 
+ *
  * Change Logs:
  * Date           Author            Notes
  * 2021/04/23     chunyexixiaoyu    first version
- 
+
  */
 
 #include "../dlmodule.h"
@@ -31,7 +31,7 @@ int dlmodule_relocate(struct rt_dlmodule *module, Elf_Rel *rel, Elf_Addr sym_val
     Elf64_Addr *where, tmp;
     Elf64_Sword addend, offset;
     rt_uint64_t upper, lower, sign, j1, j2;
-    
+
     where = (Elf64_Addr *)((rt_uint8_t *)module->mem_space
                            + rel->r_offset
                            - module->vstart_addr);
@@ -50,7 +50,7 @@ int dlmodule_relocate(struct rt_dlmodule *module, Elf_Rel *rel, Elf_Addr sym_val
         case R_RISCV_JUMP_SLOT:
             *where = (Elf64_Addr)sym_val;
             RT_DEBUG_LOG(RT_DEBUG_MODULE, ("R_RISCV_JUMP_SLOT: %x -> %x\n",where, *where));
-            break;            
+            break;
         default:
             RT_DEBUG_LOG(RT_DEBUG_MODULE, ("__riscv__ELF: invalid relocate TYPE %d\n", ELF64_R_TYPE(rel->r_info)));
             return -1;

components/libc/posix/Kconfig

@@ -41,14 +41,13 @@ config RT_USING_POSIX_DELAY
 
 config RT_USING_POSIX_CLOCK
     bool "Enable clock/time functions, clock_gettime()/clock_settime()/clock_getres() etc"
-    select RT_LIBC_USING_TIME if !RT_USING_LIBC
     select RT_USING_POSIX_DELAY
     default n
 
 config RT_USING_POSIX_GETLINE
     bool "Enable getline()/getdelim()"
-    select RT_USING_LIBC
-    select RT_LIBC_USING_FILEIO
+    select RT_USING_POSIX_FS
+    select RT_USING_POSIX_DEVIO
     default n
 
 config RT_USING_PTHREADS

components/libc/posix/io/libc.c

@@ -33,8 +33,7 @@ int libc_system_init(void)
 }
 INIT_COMPONENT_EXPORT(libc_system_init);
 
-#ifdef RT_USING_POSIX_DEVIO
-#if defined(RT_USING_LIBC) && defined(RT_USING_NEWLIB)
+#if defined(RT_USING_POSIX_DEVIO) && defined(RT_USING_NEWLIB)
 #define STDIO_DEVICE_NAME_MAX   32
 static FILE* std_console = NULL;
 int libc_stdio_set_console(const char* device_name, int mode)
@@ -135,5 +134,4 @@ int libc_stdio_set_console(const char* device_name, int mode)
 int libc_stdio_get_console(void) {
     return std_fd;
 }
-#endif /* defined(RT_USING_LIBC) && defined(RT_USING_NEWLIB) */
-#endif /* RT_USING_POSIX_DEVIO */
+#endif /* defined(RT_USING_POSIX_DEVIO) && defined(RT_USING_NEWLIB) */

components/libc/posix/signal/SConscript

@@ -7,7 +7,7 @@ src = Glob('*.c') + Glob('*.cpp')
 CPPPATH = [cwd]
 
 group = DefineGroup('POSIX', src, 
-    depend = ['RT_USING_SIGNALS', 'RT_USING_PTHREADS', 'RT_USING_LIBC'], 
+    depend = ['RT_USING_SIGNALS', 'RT_USING_PTHREADS'], 
     CPPPATH = CPPPATH)
 
 Return('group')

components/lwp/Kconfig

@@ -2,7 +2,6 @@ config RT_USING_LWP
     bool "Using light-weight process"
     select RT_USING_POSIX_FS
     select RT_USING_POSIX_SELECT
-    select RT_USING_LIBC
     depends on ARCH_ARM_CORTEX_M || ARCH_ARM_ARM9 || ARCH_ARM_CORTEX_A
     default n
     help

components/net/lwip-2.1.2/src/lwipopts.h

@@ -231,11 +231,7 @@
 #  define SSIZE_MAX LONG_MAX
 # endif
 
-#ifdef RT_USING_LIBC
 #define LWIP_NO_UNISTD_H 0
-#else
-#define LWIP_NO_UNISTD_H 1
-#endif
 
 /* ---------- Memory options ---------- */
 #define MEMCPY(dst,src,len)             rt_memcpy(dst,src,len)

components/utilities/Kconfig

@@ -136,7 +136,6 @@ config RT_USING_ULOG
         menu "log format"
             config ULOG_OUTPUT_FLOAT
                 bool "Enable float number support. It will using more thread stack."
-                select RT_USING_LIBC
                 default n
                 help
                     The default formater is using rt_vsnprint and it not supported float number.