RTEMS | C++ std::mutex has no error checks (#5641)

[Chris Johns (@chris)]

Chris Johns commented on a discussion: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5641#note_154341


This test code [lock.cpp](/-/project/26/uploads/f8441c178c662a5a45718bf92ec34b54/lock.cpp) failed on FreeBSD 15.1 built with the command line:

```
c++ -Wall -g -o lock -lpthread lock.cpp
```

```
locking test
main: m1 at0x8205c7470
main: lock: m1
t1: unlock: m at 0x8205c7470
Illegal instruction (core dumped)
```

Looking with `lldb` the start of the stack frame is:

```
(lldb) bt
* thread #2, name = 'lock', stop reason = signal SIGILL: privileged opcode
  * frame #0: 0x0000000821d1e40f libc++.so.1`std::__1::mutex::unlock() + 15
    frame #1: 0x0000000000203a7e lock`t1_body(m=0x000000082076f6e0) at lock.cpp:9:7
```

which means something in the C++ area of the compiler.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5641#note_154341
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