[Bug] smart版本启用RT_USING_PTHREADS配置后，无法通过编译，类型冲突

[laijunyong]

RT-Thread Version

v5.2.2 Release

Hardware Type/Architectures

arm

Develop Toolchain

GCC

Describe the bug

编译器类型是arm-linux-musleabi-gcc，版本信息如下：

arm-linux-musleabi-gcc (GCC) 7.3.0
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

build date: Jan  6 2023 18:24:13
musl  sha: 3536b4bc84df4672ac3b3747e36e3fa1332efc9b
build sha: 3536b4bc84df4672ac3b3747e36e3fa1332efc9b
build job: 434371

启用RT_USING_PTHREADS配置后，components/libc/posix/pthreads组件就无法通过编译：

/home/Tiimmi/codes/rtthread/rtthread/components/libc/posix/pthreads/pthread.h:37:14: error: conflicting types for 'pthread_t'
 typedef long pthread_t;
              ^~~~~~~~~
In file included from /home/Tiimmi/codes/rtthread/env/arm-linux-musleabi-linux-gnu/arm-linux-musleabi/include/sys/types.h:57:0,
                 from /home/Tiimmi/codes/rtthread/rtthread/include/rttypes.h:20,
                 from /home/Tiimmi/codes/rtthread/rtthread/include/rtsched.h:14,
                 from /home/Tiimmi/codes/rtthread/rtthread/include/rtdef.h:68,
                 from /home/Tiimmi/codes/rtthread/rtthread/include/rthw.h:23,
                 from /home/Tiimmi/codes/rtthread/rtthread/components/libc/posix/pthreads/pthread.c:16:
/home/Tiimmi/codes/rtthread/env/arm-linux-musleabi-linux-gnu/arm-linux-musleabi/include/bits/alltypes.h:301:28: note: previous declaration of 'pthread_t' was here
 typedef struct __pthread * pthread_t;
                            ^~~~~~~~~
In file included from /home/Tiimmi/codes/rtthread/rtthread/components/libc/posix/pthreads/pthread.c:17:0:
/home/Tiimmi/codes/rtthread/rtthread/components/libc/posix/pthreads/pthread.h:38:14: error: conflicting types for 'pthread_condattr_t'
 typedef long pthread_condattr_t;
              ^~~~~~~~~~~~~~~~~~
In file included from /home/Tiimmi/codes/rtthread/env/arm-linux-musleabi-linux-gnu/arm-linux-musleabi/include/sys/types.h:57:0,
                 from /home/Tiimmi/codes/rtthread/rtthread/include/rttypes.h:20,
                 from /home/Tiimmi/codes/rtthread/rtthread/include/rtsched.h:14,
                 from /home/Tiimmi/codes/rtthread/rtthread/include/rtdef.h:68,
                 from /home/Tiimmi/codes/rtthread/rtthread/include/rthw.h:23,
                 from /home/Tiimmi/codes/rtthread/rtthread/components/libc/posix/pthreads/pthread.c:16:
/home/Tiimmi/codes/rtthread/env/arm-linux-musleabi-linux-gnu/arm-linux-musleabi/include/bits/alltypes.h:327:37: note: previous declaration of 'pthread_condattr_t' was here
 typedef struct { unsigned __attr; } pthread_condattr_t;
                                     ^~~~~~~~~~~~~~~~~~
In file included from /home/Tiimmi/codes/rtthread/rtthread/components/libc/posix/pthreads/pthread.c:17:0:
/home/Tiimmi/codes/rtthread/rtthread/components/libc/posix/pthreads/pthread.h:39:14: error: conflicting types for 'pthread_rwlockattr_t'
 typedef long pthread_rwlockattr_t;
              ^~~~~~~~~~~~~~~~~~~~
In file included from /home/Tiimmi/codes/rtthread/env/arm-linux-musleabi-linux-gnu/arm-linux-musleabi/include/sys/types.h:57:0,
                 from /home/Tiimmi/codes/rtthread/rtthread/include/rttypes.h:20,
                 from /home/Tiimmi/codes/rtthread/rtthread/include/rtsched.h:14,
                 from /home/Tiimmi/codes/rtthread/rtthread/include/rtdef.h:68,
                 from /home/Tiimmi/codes/rtthread/rtthread/include/rthw.h:23,
                 from /home/Tiimmi/codes/rtthread/rtthread/components/libc/posix/pthreads/pthread.c:16:
/home/Tiimmi/codes/rtthread/env/arm-linux-musleabi-linux-gnu/arm-linux-musleabi/include/bits/alltypes.h:337:40: note: previous declaration of 'pthread_rwlockattr_t' was here
 typedef struct { unsigned __attr[2]; } pthread_rwlockattr_t;

节选了部分报错信息，剩余的报错基本都是rtthread中定义的类型与编译器头文件中定义的类型冲突了。

在网上搜索好像都没看到有人说过这个问题，只有一个2019年的issue：#3070

但是也没说解决方法。

smart版本的lwp组件强制要求musllibc，更换其他类型编译器会报：“No compatible lwp set status provided for this libc”

但是musl编译器的头文件定义的pthread类型和rtthread里的pthread.h头文件里定义的类型冲突。如何能够仍smart版本也能启用RT_USING_PTHREADS配置？

还是smart版本上使用pthread不需要启用这个配置？或者smart版本的pthread就是有问题的？

Other additional context

No response

[BernardXiong]

这个问题暂时没解决办法，因为内核也用了musl libc库，然后冲突了。可能的解决办法是，内核启用新的libc库(例如mlibc库也是为了尝试解决这个问题来考虑的)

[laijunyong]

这个问题暂时没解决办法，因为内核也用了musl libc库，然后冲突了。可能的解决办法是，内核启用新的libc库(例如mlibc库也是为了尝试解决这个问题来考虑的)

感谢回复！这个问题暂时没法解决的话，smart版本都是如何使用pthread相关的接口的呢？

我试过在smart版本关闭RT_USING_PTHREADS配置，然后在文件系统中放入musl libc库，pthread相关的接口也能够使用，但是存在接口报错了，没法定位这个问题，因为其实现没有经过rtthread原生的接口（如rt_thread_create）我无法添加打印，也不知道其执行到哪里了。
而且接口的预期行为也不一致：例如: int pthread_create(pthread_t *__restrict, const pthread_attr_t *__restrict, void *(*)(void *), void *__restrict); 这个函数，__restrict这个参数传入NULL，程序就会立马崩溃退出。但正常情况下，该参数是允许为NULL的。

直觉告诉我应该不能这么用，但我没有找到其他能够使用pthread相关接口的办法了。

[BernardXiong]

如果要使用pthreads，这个时候应该更多的在用户态来使用吧，还是需要保持内核的小而美。所以，在内核中使用pthreads，这块的诉求是什么？