improve libc time and MSVC simulator (#5775)

- [libc] 解决由于类unix操作系统发展历史原因fcntl.h定义的标志位在不同编译器中定义不同的问题
- [simulator] 部分宏定义转为全局宏定义以确保vs内置文件可以正确配置
- [simulator] 取消自欺欺人式的警告消除处理方式
- [libc][time] 优化time相关结构体在不同编译器下的包含

components/libc/compilers/common/extension/SConscript

@@ -1,5 +1,5 @@
+import os
 from building import *
-
 Import('rtconfig')
 
 src   = []
@@ -9,6 +9,13 @@ group = []
 
 src += Glob('*.c')
 
-if rtconfig.PLATFORM != 'gcc' or rtconfig.ARCH == 'sim':
+if rtconfig.PLATFORM != 'gcc':
     group = DefineGroup('Compiler', src, depend = [''], CPPPATH = CPPPATH)
+
+list = os.listdir(cwd)
+for d in list:
+    path = os.path.join(cwd, d)
+    if os.path.isfile(os.path.join(path, 'SConscript')):
+        group = group + SConscript(os.path.join(d, 'SConscript'))
+
 Return('group')

components/libc/compilers/common/extension/fcntl/README.md

@@ -0,0 +1,4 @@
+Because of the history issue, flags in fcntl.h, such as O_CREAT, have difference types of value. Some OS use hex flags and others use octal flags.
+
+In terms of RT-Thread, Keil, IAR and MSVC use octal flags, which is located in the `tcntl/octal` folder; newlib uses hex flags; musl uses octal flags.
+

components/libc/compilers/common/extension/fcntl/SConscript

@@ -0,0 +1,15 @@
+# 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')

components/libc/compilers/common/extension/fcntl/octal/SConscript

@@ -0,0 +1,14 @@
+from building import *
+Import('rtconfig')
+
+src   = []
+cwd   = GetCurrentDir()
+CPPPATH = [cwd]
+group = []
+
+if rtconfig.PLATFORM == 'armcc' or\
+   rtconfig.PLATFORM == 'armclang' or\
+   rtconfig.PLATFORM == 'iar' or\
+   rtconfig.CROSS_TOOL == 'msvc':
+    group = DefineGroup('Compiler', src, depend = [''], CPPPATH = CPPPATH)
+Return('group')

components/libc/compilers/common/sys/time.h

@@ -18,7 +18,9 @@
 #include <time.h>
 #ifdef _WIN32
 #include <winsock.h> /* for struct timeval */
-#endif
+#include <corecrt.h> /* for __time64_t */
+typedef __time64_t time_t;
+#endif /* _WIN32 */
 
 #ifdef __cplusplus
 extern "C" {
@@ -50,17 +52,17 @@ struct timeval
     time_t      tv_sec;     /* seconds */
     suseconds_t tv_usec;    /* and microseconds */
 };
-#endif
+#endif /* !defined(_TIMEVAL_DEFINED) && !defined(_WIN32) */
 
-#if !(defined(__GNUC__) && !defined(__ARMCC_VERSION)/*GCC*/) && \
-    !(defined(__ICCARM__) && (__VER__ >= 8010001)) && \
-    !defined(_WIN32)
+#if defined(__ARMCC_VERSION) || defined(_WIN32) || (defined(__ICCARM__) && (__VER__ >= 8010001))
 struct timespec
 {
     time_t  tv_sec;     /* seconds */
     long    tv_nsec;    /* and nanoseconds */
 };
+#endif /* defined(__ARMCC_VERSION) || defined(_WIN32) || (defined(__ICCARM__) && (__VER__ >= 8010001)) */
 
+#if !(defined(__GNUC__) && !defined(__ARMCC_VERSION)/*GCC*/)
 /*
  * Structure defined by POSIX.1b to be like a itimerval, but with
  * timespecs. Used in the timer_*() system calls.
@@ -70,7 +72,7 @@ struct itimerspec
     struct timespec  it_interval;
     struct timespec  it_value;
 };
-#endif
+#endif /* !(defined(__GNUC__) && !defined(__ARMCC_VERSION)) */
 
 int stime(const time_t *t);
 time_t timegm(struct tm * const t);