mlibc 集成到 RTT 中后无法编译

尝试了两个平台, 都有报错，值得注意的是报错还不一样。

可能和 mlibc 仓库里 SConscript 的什么写得不对有关？

# `bsp/qemu-vexpress-a9`

**注意，为避免 DFS 编译报错问题，不将 DFS v2.0 切换为 DFS v1.0**。其他都参考 README 执行选择 **下载mlibc软件包**， 记得要 `pkgs --update` 一下确保 mlbc 下载了。

执行 scons，报如下错误：
```shell
u@u:~/ws/duo/rt-thread/bsp/qemu-vexpress-a9$ scons 
scons: Reading SConscript files ...
scons: done reading SConscript files.
scons: Building targets ...
scons: building associated VariantDir targets: build
CC build/applications/lcd_init.o
CC build/applications/main.o
CC build/applications/mnt.o
In file included from packages/mlibc-latest/include/sys/statfs.h:18,
                 from /home/u/ws/duo/rt-thread/components/dfs/dfs_v2/include/dfs.h:22,
                 from /home/u/ws/duo/rt-thread/components/dfs/dfs_v2/include/dfs_fs.h:15,
                 from applications/mnt.c:18:
packages/mlibc-latest/include/sys/statvfs.h:18:10: fatal error: alltypes.h: No such file or directory
   18 | #include <alltypes.h>
      |          ^~~~~~~~~~~~
compilation terminated.
scons: *** [build/applications/mnt.o] Error 1
scons: building terminated because of errors.
```

# `bsp/qemu-virt64-riscv`

先参考 `bsp/qemu-virt64-riscv/README_cn.md` 确保 RTT 标准版可以编译。

然后重新 menuconfig，参考 vexpress-a9 选择下载 mlibc。然后 scons -c 后重新编译，报错如下：

```shell
u@u:~/ws/duo/rt-thread/bsp/qemu-virt64-riscv$ scons
scons: Reading SConscript files ...
scons: done reading SConscript files.
scons: Building targets ...
scons: building associated VariantDir targets: build
CC build/applications/main.o
In file included from /home/u/ws/duo/rt-thread/components/libc/compilers/common/include/sys/signal.h:230,
                 from /home/u/ws/duo/rt-thread/include/rttypes.h:23,
                 from /home/u/ws/duo/rt-thread/include/rtsched.h:14,
                 from /home/u/ws/duo/rt-thread/include/rtdef.h:68,
                 from /home/u/ws/duo/rt-thread/include/rtthread.h:32,
                 from applications/main.c:10:
packages/mlibc-latest/include/signal.h:20: warning: "SIGBUS" redefined
   20 | #define SIGBUS    7
      | 
In file included from /home/u/ws/duo/rt-thread/include/rttypes.h:23,
                 from /home/u/ws/duo/rt-thread/include/rtsched.h:14,
                 from /home/u/ws/duo/rt-thread/include/rtdef.h:68,
                 from /home/u/ws/duo/rt-thread/include/rtthread.h:32,
                 from applications/main.c:10:
/home/u/ws/duo/rt-thread/components/libc/compilers/common/include/sys/signal.h:201: note: this is the location of the previous definition
  201 | #define SIGBUS  10  /* bus error */
      | 
In file included from /home/u/ws/duo/rt-thread/components/libc/compilers/common/include/sys/signal.h:230,
                 from /home/u/ws/duo/rt-thread/include/rttypes.h:23,
                 from /home/u/ws/duo/rt-thread/include/rtsched.h:14,
                 from /home/u/ws/duo/rt-thread/include/rtdef.h:68,
                 from /home/u/ws/duo/rt-thread/include/rtthread.h:32,
                 from applications/main.c:10:
packages/mlibc-latest/include/signal.h:34: warning: "SIGCHLD" redefined
   34 | #define SIGCHLD   17
      | 
In file included from /home/u/ws/duo/rt-thread/include/rttypes.h:23,
                 from /home/u/ws/duo/rt-thread/include/rtsched.h:14,
                 from /home/u/ws/duo/rt-thread/include/rtdef.h:68,
                 from /home/u/ws/duo/rt-thread/include/rtthread.h:32,
                 from applications/main.c:10:
/home/u/ws/duo/rt-thread/components/libc/compilers/common/include/sys/signal.h:211: note: this is the location of the previous definition
  211 | #define SIGCHLD 20  /* to parent on child stop or exit */
      | 
In file included from /home/u/ws/duo/rt-thread/components/libc/compilers/common/include/sys/signal.h:230,
                 from /home/u/ws/duo/rt-thread/include/rttypes.h:23,
                 from /home/u/ws/duo/rt-thread/include/rtsched.h:14,
                 from /home/u/ws/duo/rt-thread/include/rtdef.h:68,
                 from /home/u/ws/duo/rt-thread/include/rtthread.h:32,
                 from applications/main.c:10:
packages/mlibc-latest/include/signal.h:61: warning: "SIGSYS" redefined
   61 | #define SIGSYS    31
      | 
In file included from /home/u/ws/duo/rt-thread/include/rttypes.h:23,
                 from /home/u/ws/duo/rt-thread/include/rtsched.h:14,
                 from /home/u/ws/duo/rt-thread/include/rtdef.h:68,
                 from /home/u/ws/duo/rt-thread/include/rtthread.h:32,
                 from applications/main.c:10:
/home/u/ws/duo/rt-thread/components/libc/compilers/common/include/sys/signal.h:203: note: this is the location of the previous definition
  203 | #define SIGSYS  12  /* bad argument to system call */
      | 
In file included from /home/u/ws/duo/rt-thread/components/libc/compilers/common/include/sys/signal.h:230,
                 from /home/u/ws/duo/rt-thread/include/rttypes.h:23,
                 from /home/u/ws/duo/rt-thread/include/rtsched.h:14,
                 from /home/u/ws/duo/rt-thread/include/rtdef.h:68,
                 from /home/u/ws/duo/rt-thread/include/rtthread.h:32,
                 from applications/main.c:10:
packages/mlibc-latest/include/signal.h:108:7: error: redefinition of 'union sigval'
  108 | union sigval
      |       ^~~~~~
In file included from /home/u/ws/duo/rt-thread/include/rttypes.h:23,
                 from /home/u/ws/duo/rt-thread/include/rtsched.h:14,
                 from /home/u/ws/duo/rt-thread/include/rtdef.h:68,
                 from /home/u/ws/duo/rt-thread/include/rtthread.h:32,
                 from applications/main.c:10:
/home/u/ws/duo/rt-thread/components/libc/compilers/common/include/sys/signal.h:50:7: note: originally defined here
   50 | union sigval
      |       ^~~~~~
In file included from /home/u/ws/duo/rt-thread/components/libc/compilers/common/include/sys/signal.h:230,
                 from /home/u/ws/duo/rt-thread/include/rttypes.h:23,
                 from /home/u/ws/duo/rt-thread/include/rtsched.h:14,
                 from /home/u/ws/duo/rt-thread/include/rtdef.h:68,
                 from /home/u/ws/duo/rt-thread/include/rtthread.h:32,
                 from applications/main.c:10:
packages/mlibc-latest/include/signal.h:114:8: error: redefinition of 'struct sigaction'
  114 | struct sigaction
      |        ^~~~~~~~~
In file included from /home/u/ws/duo/rt-thread/include/rttypes.h:23,
                 from /home/u/ws/duo/rt-thread/include/rtsched.h:14,
                 from /home/u/ws/duo/rt-thread/include/rtdef.h:68,
                 from /home/u/ws/duo/rt-thread/include/rtthread.h:32,
                 from applications/main.c:10:
/home/u/ws/duo/rt-thread/components/libc/compilers/common/include/sys/signal.h:83:8: note: originally defined here
   83 | struct sigaction
      |        ^~~~~~~~~
In file included from /home/u/ws/duo/rt-thread/components/libc/compilers/common/include/sys/signal.h:230,
                 from /home/u/ws/duo/rt-thread/include/rttypes.h:23,
                 from /home/u/ws/duo/rt-thread/include/rtsched.h:14,
                 from /home/u/ws/duo/rt-thread/include/rtdef.h:68,
                 from /home/u/ws/duo/rt-thread/include/rtthread.h:32,
                 from applications/main.c:10:
packages/mlibc-latest/include/signal.h:121:8: error: redefinition of 'struct sigevent'
  121 | struct sigevent
      |        ^~~~~~~~
In file included from /home/u/ws/duo/rt-thread/include/rttypes.h:23,
                 from /home/u/ws/duo/rt-thread/include/rtsched.h:14,
                 from /home/u/ws/duo/rt-thread/include/rtdef.h:68,
                 from /home/u/ws/duo/rt-thread/include/rtthread.h:32,
                 from applications/main.c:10:
/home/u/ws/duo/rt-thread/components/libc/compilers/common/include/sys/signal.h:56:8: note: originally defined here
   56 | struct sigevent
      |        ^~~~~~~~
In file included from /home/u/ws/duo/rt-thread/components/libc/compilers/common/include/sys/signal.h:230,
                 from /home/u/ws/duo/rt-thread/include/rttypes.h:23,
                 from /home/u/ws/duo/rt-thread/include/rtsched.h:14,
                 from /home/u/ws/duo/rt-thread/include/rtdef.h:68,
                 from /home/u/ws/duo/rt-thread/include/rtthread.h:32,
                 from applications/main.c:10:
packages/mlibc-latest/include/signal.h:175:3: error: conflicting types for 'siginfo_t'
  175 | } siginfo_t;
      |   ^~~~~~~~~
In file included from /home/u/ws/duo/rt-thread/include/rttypes.h:23,
                 from /home/u/ws/duo/rt-thread/include/rtsched.h:14,
                 from /home/u/ws/duo/rt-thread/include/rtdef.h:68,
                 from /home/u/ws/duo/rt-thread/include/rtthread.h:32,
                 from applications/main.c:10:
/home/u/ws/duo/rt-thread/components/libc/compilers/common/include/sys/signal.h:72:24: note: previous declaration of 'siginfo_t' was here
   72 | typedef struct siginfo siginfo_t;
      |                        ^~~~~~~~~
packages/mlibc-latest/include/signal.h:201:26: error: expected ')' before '*' token
  201 | int sigemptyset(sigset_t *set);
      |                          ^
/home/u/ws/duo/rt-thread/components/libc/compilers/common/include/sys/signal.h:106:32: note: in definition of macro 'sigemptyset'
  106 | #define sigemptyset(what)   (*(what) = 0, 0)
      |                                ^~~~
/home/u/ws/duo/rt-thread/components/libc/compilers/common/include/sys/signal.h:106:38: error: expected ')' before '=' token
  106 | #define sigemptyset(what)   (*(what) = 0, 0)
      |                                      ^
packages/mlibc-latest/include/signal.h:201:5: note: in expansion of macro 'sigemptyset'
  201 | int sigemptyset(sigset_t *set);
      |     ^~~~~~~~~~~
scons: *** [build/applications/main.o] Error 1
scons: building terminated because of errors.
```


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mlibc 集成到 RTT 中后无法编译 #61

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`bsp/qemu-vexpress-a9`

`bsp/qemu-virt64-riscv`