!871 fix: newlib for liteos_a and clip for liteos_a_mini

Merge pull request !871 from Harylee/qemu

BUILD.gn

@@ -35,6 +35,7 @@ declare_args() {
   tee_enable = false
   liteos_name = "OHOS_Image"
   liteos_skip_make = false
+  liteos_is_mini = false
 }
 
 tee = ""
@@ -128,7 +129,9 @@ config("stdinc_config") {
     "-isystem",
     std_include,
   ]
-  cflags += [ "-nostdinc" ]
+  if (!defined(LOSCFG_LIBC_NEWLIB)) {
+    cflags += [ "-nostdinc" ]
+  }
   asmflags = cflags
 }
 
@@ -315,14 +318,16 @@ group("kernel") {
 }
 
 group("liteos_a") {
-  deps = [
-    ":apps",
-    ":kernel",
-    ":tests",
-    "//prebuilts/lite/sysroot/build:strip",
-  ]
-  if (liteos_skip_make == false) {
-    deps += [ ":make" ]
+  deps = [ ":kernel" ]
+  if (!liteos_is_mini) {
+    deps += [
+      ":apps",
+      ":tests",
+      "//prebuilts/lite/sysroot/build:strip",
+    ]
+    if (liteos_skip_make == false) {
+      deps += [ ":make" ]
+    }
   }
 }
 
@@ -339,6 +344,17 @@ executable("liteos") {
     "-Wl,--no-eh-frame-hdr",
   ]
 
+  if (defined(LOSCFG_LIBC_NEWLIB)) {
+    ldflags += [
+      "-Wl,--wrap=_free_r",
+      "-Wl,--wrap,_malloc_usable_size_r",
+      "-Wl,--wrap,_malloc_r",
+      "-Wl,--wrap,_memalign_r",
+      "-Wl,--wrap,_realloc_r",
+      "-Wl,--wrap,_fseeko_r",
+    ]
+    ldflags -= [ "-nostdlib" ]
+  }
   libgcc = exec_script("//build/lite/run_shell_cmd.py",
                        [ "$cc -print-libgcc-file-name" ],
                        "trim string")
@@ -350,7 +366,7 @@ executable("liteos") {
   } else {
     ldflags +=
         [ "-Wl,-T" + rebase_path("tools/build/liteos.ld", root_build_dir) ]
-    ldflags += [ "-Wl,-nostartfiles" ]
+    ldflags += [ "-nostartfiles" ]
     inputs = [ "tools/build/liteos.ld" ]
   }
 

arch/arm/arm/src/los_exc.c

@@ -88,6 +88,7 @@ STATIC UINT32 g_nextExcWaitCpu = INVALID_CPUID;
 #define OS_MAX_BACKTRACE    15U
 #define DUMPSIZE            128U
 #define DUMPREGS            12U
+#define COM_REGS            4U
 #define INSTR_SET_MASK      0x01000020U
 #define THUMB_INSTR_LEN     2U
 #define ARM_INSTR_LEN       4U
@@ -516,13 +517,22 @@ VOID OsDumpContextMem(const ExcContext *excBufAddr)
         return;
     }
 
-    for (excReg = &(excBufAddr->R0); count <= DUMPREGS; excReg++, count++) {
+    for (excReg = &(excBufAddr->R0); count < COM_REGS; excReg++, count++) {
         if (IS_VALID_ADDR(*excReg)) {
             PrintExcInfo("\ndump mem around R%u:%p", count, (*excReg));
             OsDumpMemByte(DUMPSIZE, ((*excReg) - (DUMPSIZE >> 1)));
         }
     }
-
+    for (excReg = &(excBufAddr->R4); count < DUMPREGS; excReg++, count++) {
+        if (IS_VALID_ADDR(*excReg)) {
+            PrintExcInfo("\ndump mem around R%u:%p", count, (*excReg));
+            OsDumpMemByte(DUMPSIZE, ((*excReg) - (DUMPSIZE >> 1)));
+        }
+    }
+    if (IS_VALID_ADDR(excBufAddr->R12)) {
+        PrintExcInfo("\ndump mem around R12:%p", excBufAddr->R12);
+        OsDumpMemByte(DUMPSIZE, (excBufAddr->R12 - (DUMPSIZE >> 1)));
+    }
     if (IS_VALID_ADDR(excBufAddr->SP)) {
         PrintExcInfo("\ndump mem around SP:%p", excBufAddr->SP);
         OsDumpMemByte(DUMPSIZE, (excBufAddr->SP - (DUMPSIZE >> 1)));
@@ -645,6 +655,7 @@ STATIC INLINE BOOL FindSuitableStack(UINTPTR regFP, UINTPTR *start, UINTPTR *end
     const StackInfo *stack = NULL;
     vaddr_t kvaddr;
 
+#ifdef LOSCFG_KERNEL_VM
     if (g_excFromUserMode[ArchCurrCpuid()] == TRUE) {
         taskCB = OsCurrTaskGet();
         stackStart = taskCB->userMapBase;
@@ -655,6 +666,7 @@ STATIC INLINE BOOL FindSuitableStack(UINTPTR regFP, UINTPTR *start, UINTPTR *end
         }
         return found;
     }
+#endif
 
     /* Search in the task stacks */
     for (index = 0; index < g_taskMaxNum; index++) {

compat/posix/src/time.c

@@ -387,9 +387,16 @@ int gettimeofday64(struct timeval64 *tv, struct timezone *tz)
 }
 #endif
 
+#ifdef LOSCFG_LIBC_NEWLIB
+int gettimeofday(struct timeval *tv, void *_tz)
+#else
 int gettimeofday(struct timeval *tv, struct timezone *tz)
+#endif
 {
     struct timeval64 stTimeVal64 = {0};
+#ifdef LOSCFG_LIBC_NEWLIB
+    struct timezone *tz = (struct timezone *)_tz;
+#endif
 
     if (tv == NULL) {
         TIME_RETURN(EINVAL);
@@ -718,6 +725,7 @@ typedef struct {
 
 static VOID SwtmrProc(UINTPTR tmrArg)
 {
+#ifdef LOSCFG_KERNEL_VM
     INT32 sig, ret;
     UINT32 intSave;
     pid_t pid;
@@ -761,9 +769,47 @@ static VOID SwtmrProc(UINTPTR tmrArg)
     return;
 EXIT:
     PRINT_ERR("Dispatch signals failed!, ret: %d\r\n", ret);
+#endif
     return;
 }
 
+int timer_create(clockid_t clockID, struct sigevent *restrict evp, timer_t *restrict timerID)
+{
+    UINT32 ret;
+    UINT16 swtmrID;
+#ifdef LOSCFG_SECURITY_VID
+    UINT16 vid;
+#endif
+
+    if (!timerID || (clockID != CLOCK_REALTIME) || !evp) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    if ((evp->sigev_notify != SIGEV_THREAD) || evp->sigev_notify_attributes) {
+        errno = ENOTSUP;
+        return -1;
+    }
+
+    ret = LOS_SwtmrCreate(1, LOS_SWTMR_MODE_ONCE, (SWTMR_PROC_FUNC)evp->sigev_notify_function,
+                          &swtmrID, (UINTPTR)evp->sigev_value.sival_ptr);
+    if (ret != LOS_OK) {
+        errno = (ret == LOS_ERRNO_SWTMR_MAXSIZE) ? EAGAIN : EINVAL;
+        return -1;
+    }
+
+#ifdef LOSCFG_SECURITY_VID
+    vid = AddNodeByRid(swtmrID);
+    if (vid == MAX_INVALID_TIMER_VID) {
+        (VOID)LOS_SwtmrDelete(swtmrID);
+        return -1;
+    }
+    swtmrID = vid;
+#endif
+    *timerID = (timer_t)(UINTPTR)swtmrID;
+    return 0;
+}
+
 int OsTimerCreate(clockid_t clockID, struct ksigevent *evp, timer_t *timerID)
 {
     UINT32 ret;
@@ -823,6 +869,7 @@ int timer_delete(timer_t timerID)
 {
     UINT16 swtmrID = (UINT16)(UINTPTR)timerID;
     VOID *arg = NULL;
+    UINTPTR swtmrProc;
 
 #ifdef LOSCFG_SECURITY_VID
     swtmrID = GetRidByVid(swtmrID);
@@ -832,10 +879,11 @@ int timer_delete(timer_t timerID)
     }
 
     arg = (VOID *)OS_SWT_FROM_SID(swtmrID)->uwArg;
+    swtmrProc = (UINTPTR)OS_SWT_FROM_SID(swtmrID)->pfnHandler;
     if (LOS_SwtmrDelete(swtmrID)) {
         goto ERROUT;
     }
-    if (arg != NULL) {
+    if ((swtmrProc == (UINTPTR)SwtmrProc) && (arg != NULL)) {
         free(arg);
     }
 
@@ -979,7 +1027,11 @@ STATIC INT32 DoNanoSleep(UINT64 nanoseconds)
     return -1;
 }
 
+#ifdef LOSCFG_LIBC_NEWLIB
+int usleep(unsigned long useconds)
+#else
 int usleep(unsigned useconds)
+#endif
 {
     return DoNanoSleep((UINT64)useconds * OS_SYS_NS_PER_US);
 }

drivers/block/disk/include/disk.h

@@ -163,7 +163,7 @@ extern "C" {
 #define DISK_ATA_GET_MODEL      21  /* Get model name */
 #define DISK_ATA_GET_SN         22  /* Get serial number */
 
-#ifdef LOSCFG_FS_FAT_CACHE
+#ifndef LOSCFG_FS_FAT_CACHE
 #define DISK_DIRECT_BUFFER_SIZE 4   /* los_disk direct io buffer when bcache is off */
 #endif
 

kernel/base/core/los_task.c

@@ -226,6 +226,9 @@ LITE_OS_SEC_TEXT_INIT UINT32 OsIdleTaskCreate(VOID)
     taskInitParam.usCpuAffiMask = CPUID_TO_AFFI_MASK(ArchCurrCpuid());
 #endif
     ret = LOS_TaskCreateOnly(&idleTaskID, &taskInitParam);
+    if (ret != LOS_OK) {
+        return ret;
+    }
     LosTaskCB *idleTask = OS_TCB_FROM_TID(idleTaskID);
     idleTask->taskStatus |= OS_TASK_FLAG_SYSTEM_TASK;
     OsSchedRunqueueIdleInit(idleTaskID);

kernel/base/include/los_sched_pri.h

@@ -41,7 +41,9 @@
 #endif
 #include "los_stackinfo_pri.h"
 #include "los_futex_pri.h"
+#ifdef LOSCFG_KERNEL_PM
 #include "los_pm_pri.h"
+#endif
 #include "los_signal.h"
 #ifdef LOSCFG_KERNEL_CPUP
 #include "los_cpup_pri.h"
@@ -555,9 +557,11 @@ STATIC INLINE VOID SchedTaskFreeze(LosTaskCB *taskCB)
 {
     UINT64 responseTime;
 
+#ifdef LOSCFG_KERNEL_PM
     if (!OsIsPmMode()) {
         return;
     }
+#endif
 
     if (!(taskCB->taskStatus & (OS_TASK_STATUS_PEND_TIME | OS_TASK_STATUS_DELAY))) {
         return;

kernel/common/los_printf.c

@@ -198,6 +198,7 @@ __attribute__((noinline)) VOID UartPrintf(const CHAR *fmt, ...)
     va_end(ap);
 }
 
+#ifndef LOSCFG_LIBC_NEWLIB
 __attribute__((noinline)) VOID dprintf(const CHAR *fmt, ...)
 {
     va_list ap;
@@ -210,6 +211,7 @@ __attribute__((noinline)) VOID dprintf(const CHAR *fmt, ...)
 #endif
     va_end(ap);
 }
+#endif
 
 VOID LkDprintf(const CHAR *fmt, va_list ap)
 {
@@ -279,7 +281,7 @@ VOID LOS_LkPrint(INT32 level, const CHAR *func, INT32 line, const CHAR *fmt, ...
     }
 
     if ((level != LOS_COMMON_LEVEL) && ((level > LOS_EMG_LEVEL) && (level <= LOS_TRACE_LEVEL))) {
-        dprintf("[%s][%s:%s]", g_logString[level],
+        PRINTK("[%s][%s:%s]", g_logString[level],
                 ((OsCurrProcessGet() == NULL) ? "NULL" : OsCurrProcessGet()->processName),
                 ((OsCurrTaskGet() == NULL) ? "NULL" : OsCurrTaskGet()->taskName));
     }

kernel/extended/hilog/los_hilog.c

@@ -179,7 +179,7 @@ static ssize_t HiLogRead(struct file *filep, char *buffer, size_t bufLen)
     }
 
     if (bufLen < header.len + sizeof(header)) {
-        dprintf("buffer too small,bufLen=%d, header.len=%d,%d\n", bufLen, header.len, header.hdrSize);
+        PRINTK("buffer too small,bufLen=%d, header.len=%d,%d\n", bufLen, header.len, header.hdrSize);
         retval = -ENOMEM;
         goto out;
     }
@@ -238,7 +238,7 @@ static void HiLogHeadInit(struct HiLogEntry *header, size_t len)
 
     ret = clock_gettime(CLOCK_REALTIME, &now);
     if (ret != 0) {
-        dprintf("In %s line %d,clock_gettime fail\n", __FUNCTION__, __LINE__);
+        PRINTK("In %s line %d,clock_gettime fail\n", __FUNCTION__, __LINE__);
         return;
     }
 
@@ -274,7 +274,7 @@ static void HiLogCoverOldLog(size_t bufLen)
     if (isLastTimeFull == 1 && isThisTimeFull == 0) {
         /* so we can only print one log if hilog ring buffer is full in a short time */
         if (dropLogLines > 0) {
-            dprintf("hilog ringbuffer full, drop %d line(s) log\n", dropLogLines);
+            PRINTK("hilog ringbuffer full, drop %d line(s) log\n", dropLogLines);
         }
         isLastTimeFull = 0;
         dropLogLines = 0;
@@ -319,7 +319,7 @@ out:
         wake_up_interruptible(&g_hiLogDev.wq);
     }
     if (retval < 0) {
-        dprintf("write fail retval=%d\n", retval);
+        PRINTK("write fail retval=%d\n", retval);
     }
     return retval;
 }
@@ -328,7 +328,7 @@ static ssize_t HiLogWrite(struct file *filep, const char *buffer, size_t bufLen)
 {
     (void)filep;
     if (bufLen + sizeof(struct HiLogEntry) > HILOG_BUFFER) {
-        dprintf("input too large\n");
+        PRINTK("input too large\n");
         return -ENOMEM;
     }
 
@@ -339,7 +339,7 @@ static void HiLogDeviceInit(void)
 {
     g_hiLogDev.buffer = LOS_MemAlloc((VOID *)OS_SYS_MEM_ADDR, HILOG_BUFFER);
     if (g_hiLogDev.buffer == NULL) {
-        dprintf("In %s line %d,LOS_MemAlloc fail\n", __FUNCTION__, __LINE__);
+        PRINTK("In %s line %d,LOS_MemAlloc fail\n", __FUNCTION__, __LINE__);
     }
 
     init_waitqueue_head(&g_hiLogDev.wq);

kernel/include/los_printf.h

@@ -87,9 +87,9 @@ typedef VOID (*pf_OUTPUT)(const CHAR *fmt, ...);
  * <ul><li>los_printf.h: the header file that contains the API declaration.</li></ul>
  * @see printf
  */
+#ifndef LOSCFG_LIBC_NEWLIB
 extern void dprintf(const char *fmt, ...);
-
-#define diag_printf      dprintf
+#endif
 
 #define PRINT_DEBUG(fmt, args...)    LOS_LkPrint(LOS_DEBUG_LEVEL, __FUNCTION__, __LINE__, fmt, ##args)
 #define PRINT_INFO(fmt, args...)     LOS_LkPrint(LOS_INFO_LEVEL, __FUNCTION__, __LINE__, fmt, ##args)

lib/Kconfig

@@ -5,6 +5,20 @@ config LIB_LIBC
     help
       Answer Y to enable libc for full code.
 
+choice
+    prompt "choose libc"
+    default LIBC_MUSL
+    depends on LIB_LIBC
+    help
+      Choose libc.
+
+config LIBC_NEWLIB
+    bool "newlibc"
+
+config LIBC_MUSL
+    bool "musl libc"
+endchoice
+
 config LIB_ZLIB
     bool "Enable Zlib"
     default y

lib/libc/BUILD.gn

 # Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
-# Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
+# Copyright (c) 2020-2022 Huawei Device Co., Ltd. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without modification,
 # are permitted provided that the following conditions are met:
@@ -29,93 +29,16 @@
 
 import("//kernel/liteos_a/liteos.gni")
 
-MUSLDIR = "$LITEOSTHIRDPARTY/musl"
-
-import("//third_party/optimized-routines/optimized-routines.gni")
-import("$MUSLDIR/porting/liteos_a/kernel/musl.gni")
-
-module_switch = defined(LOSCFG_LIB_LIBC)
-module_name = get_path_info(rebase_path("."), "name")
-kernel_module(module_name) {
-  sources = MUSL_SRC_COMMON
-
-  if (defined(LOSCFG_ARCH_ARM_AARCH32)) {
-    sources += MUSL_SRC_ARM
-    foreach(f, MUSL_SRC_ARM) {
-      sources -= [ string_replace(f, "/arm/", "/") ]
-    }
-  }
-
-  if (LOSCFG_ARCH_ARM_VER == "armv7-a") {
-    sources -= [
-      "$MUSLPORTINGDIR/src/string/memchr.c",
-      "$MUSLPORTINGDIR/src/string/memcpy.c",
-      "$MUSLPORTINGDIR/src/string/strcmp.c",
-      "$MUSLPORTINGDIR/src/string/strcpy.c",
-      "$MUSLPORTINGDIR/src/string/strlen.c",
-    ]
-    sources += [
-      "src/arch/arm/memcmp.S",
-      "src/arch/arm/memset.S",
-    ]
-    sources += OPTRT_STRING_ARM_SRC_FILES_FOR_ARMV7_A
-    asmflags = [
-      "-D__strlen_armv6t2=strlen",
-      "-D__strcmp_arm=strcmp",
-      "-D__memchr_arm=memchr",
-    ]
-    if (defined(LOSCFG_KERNEL_LMS)) {
-      asmflags += [
-        "-D__memcpy_arm=__memcpy",
-        "-D__strcpy_arm=__strcpy",
-      ]
-    } else {
-      asmflags += [
-        "-D__memcpy_arm=memcpy",
-        "-D__strcpy_arm=strcpy",
-      ]
-    }
-  } else {
-    # arch is not armv7-a
-    sources += [
-      "src/memcmp.c",
-      "src/memset.c",
-    ]
-  }
-
-  include_dirs = [
-    "$MUSLPORTINGDIR/src/include",
-    "$MUSLPORTINGDIR/src/internal",
+group("libc") {
+  deps = [
+    "musl",
+    "newlib",
   ]
-
-  public_configs = [ ":public" ]
-  configs += [ ":private" ]
 }
 
 config("public") {
-  cflags = [
-    "-isystem",
-    rebase_path("$MUSLPORTINGDIR/include"),
-  ]
-}
-
-config("private") {
-  if (defined(LOSCFG_COMPILER_CLANG_LLVM)) {
-    cflags = [
-      "-Wno-char-subscripts",
-      "-Wno-unknown-pragmas",
-    ]
-  } else {
-    cflags = [
-      "-frounding-math",
-      "-Wno-unused-but-set-variable",
-      "-Wno-unknown-pragmas",
-    ]
-  }
-
-  cflags += [
-    "-Wno-shift-op-parentheses",
-    "-Wno-logical-op-parentheses",
-    "-Wno-bitwise-op-parentheses",
+  configs = [
+    "musl:public",
+    "newlib:public",
   ]
 }

lib/libc/musl/BUILD.gn

+# Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
+# Copyright (c) 2020-2022 Huawei Device Co., Ltd. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without modification,
+# are permitted provided that the following conditions are met:
+#
+# 1. Redistributions of source code must retain the above copyright notice, this list of
+#    conditions and the following disclaimer.
+#
+# 2. Redistributions in binary form must reproduce the above copyright notice, this list
+#    of conditions and the following disclaimer in the documentation and/or other materials
+#    provided with the distribution.
+#
+# 3. Neither the name of the copyright holder nor the names of its contributors may be used
+#    to endorse or promote products derived from this software without specific prior written
+#    permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+import("//kernel/liteos_a/liteos.gni")
+
+MUSLDIR = "$LITEOSTHIRDPARTY/musl"
+
+import("//third_party/optimized-routines/optimized-routines.gni")
+import("$MUSLDIR/porting/liteos_a/kernel/musl.gni")
+
+module_switch = defined(LOSCFG_LIBC_MUSL)
+module_name = get_path_info(rebase_path("."), "name")
+kernel_module(module_name) {
+  sources = MUSL_SRC_COMMON
+
+  if (defined(LOSCFG_ARCH_ARM_AARCH32)) {
+    sources += MUSL_SRC_ARM
+    foreach(f, MUSL_SRC_ARM) {
+      sources -= [ string_replace(f, "/arm/", "/") ]
+    }
+  }
+
+  if (LOSCFG_ARCH_ARM_VER == "armv7-a") {
+    sources -= [
+      "$MUSLPORTINGDIR/src/string/memchr.c",
+      "$MUSLPORTINGDIR/src/string/memcpy.c",
+      "$MUSLPORTINGDIR/src/string/strcmp.c",
+      "$MUSLPORTINGDIR/src/string/strcpy.c",
+      "$MUSLPORTINGDIR/src/string/strlen.c",
+    ]
+    sources += [
+      "src/arch/arm/memcmp.S",
+      "src/arch/arm/memset.S",
+    ]
+    sources += OPTRT_STRING_ARM_SRC_FILES_FOR_ARMV7_A
+    asmflags = [
+      "-D__strlen_armv6t2=strlen",
+      "-D__strcmp_arm=strcmp",
+      "-D__memchr_arm=memchr",
+    ]
+    if (defined(LOSCFG_KERNEL_LMS)) {
+      asmflags += [
+        "-D__memcpy_arm=__memcpy",
+        "-D__strcpy_arm=__strcpy",
+      ]
+    } else {
+      asmflags += [
+        "-D__memcpy_arm=memcpy",
+        "-D__strcpy_arm=strcpy",
+      ]
+    }
+  } else {
+    # arch is not armv7-a
+    sources += [
+      "src/memcmp.c",
+      "src/memset.c",
+    ]
+  }
+
+  include_dirs = [
+    "$MUSLPORTINGDIR/src/include",
+    "$MUSLPORTINGDIR/src/internal",
+  ]
+
+  public_configs = [ ":public" ]
+  configs += [ ":private" ]
+}
+
+config("public") {
+  cflags = [
+    "-isystem",
+    rebase_path("$MUSLPORTINGDIR/include"),
+  ]
+}
+
+config("private") {
+  if (defined(LOSCFG_COMPILER_CLANG_LLVM)) {
+    cflags = [
+      "-Wno-char-subscripts",
+      "-Wno-unknown-pragmas",
+    ]
+  } else {
+    cflags = [
+      "-frounding-math",
+      "-Wno-unused-but-set-variable",
+      "-Wno-unknown-pragmas",
+    ]
+  }
+
+  cflags += [
+    "-Wno-shift-op-parentheses",
+    "-Wno-logical-op-parentheses",
+    "-Wno-bitwise-op-parentheses",
+  ]
+}

lib/libc/newlib/BUILD.gn

+# Copyright (c) 2022-2022 Huawei Device Co., Ltd. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without modification,
+# are permitted provided that the following conditions are met:
+#
+# 1. Redistributions of source code must retain the above copyright notice, this list of
+#    conditions and the following disclaimer.
+#
+# 2. Redistributions in binary form must reproduce the above copyright notice, this list
+#    of conditions and the following disclaimer in the documentation and/or other materials
+#    provided with the distribution.
+#
+# 3. Neither the name of the copyright holder nor the names of its contributors may be used
+#    to endorse or promote products derived from this software without specific prior written
+#    permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+import("//kernel/liteos_a/liteos.gni")
+import("//third_party/musl/porting/liteos_a_newlib/kernel/newlib.gni")
+
+module_switch = defined(LOSCFG_LIBC_NEWLIB)
+module_name = get_path_info(rebase_path("."), "name")
+kernel_module(module_name) {
+  sources = NEWLIB_ADAPT_SRC_COMMON
+  configs += [ "$LITEOSTOPDIR:warn_config" ]
+
+  configs += [ ":private" ]
+}
+
+config("public") {
+  include_dirs = [ "porting/include" ]
+  include_dirs += NEWLIB_ADAPT_INCLUDE_DIRS
+}
+
+config("private") {
+  cflags = [
+    "-frounding-math",
+    "-Wno-unused-but-set-variable",
+    "-Wno-unknown-pragmas",
+  ]
+
+  cflags += [
+    "-Wno-shift-op-parentheses",
+    "-Wno-logical-op-parentheses",
+    "-Wno-bitwise-op-parentheses",
+  ]
+}

tools/build/mk/los_config.mk

@@ -204,7 +204,7 @@ LIB_SUBDIRS         += lib/libscrew
 LITEOS_LIBSCREW_INCLUDE += -I $(LITEOSTOPDIR)/lib/libscrew/include
 
 ifeq ($(LOSCFG_LIB_LIBC), y)
-    LIB_SUBDIRS           += lib/libc
+    LIB_SUBDIRS           += lib/libc/musl
     LITEOS_BASELIB        += -lc
     LITEOS_LIBC_INCLUDE   += \
         -isystem $(LITEOSTHIRDPARTY)/musl/porting/liteos_a/kernel/include