开启C++ 功能后，env工具构建编译正常，Keil编译报错，求助

发布于 2022-10-14 16:18:13 浏览：876 订阅该版

求助，我现在要用RTThread的C++功能，我用env工具进行配置开启的，用的bsp是stm32h743-atk-apollo,

![RT1.jpg](https://oss-club.rt-thread.org/uploads/20221014/65b21c5966cff6f621ed5d24b0304a0d.jpg.webp "RT1.jpg")

![RT2.jpg](https://oss-club.rt-thread.org/uploads/20221014/754d2ce60a80dea37fbccc219adcc57d.jpg.webp "RT2.jpg")

用env scons --target=mdk5进行构建编译正常。

![RT3.jpg](https://oss-club.rt-thread.org/uploads/20221014/e761885a70ca3a0a50af629fdde04493.jpg.webp "RT3.jpg")

![RT4.jpg](https://oss-club.rt-thread.org/uploads/20221014/9069916f82e76d24ff18cfd363fd8069.jpg.webp "RT4.jpg")
但是用keil IDE软件打开编译报错，就是找不到一些符号，
```
..\components\libc\cplusplus\cpp11\thread_local_impl.cpp(21): error: #20: identifier “abort” is undefind ..\components\libc\cplusplus\cpp11\emutls.c(135): error: #20: identifier “__ATOMIC_ACQUIRE” is undefind
..\components\libc\cplusplus\cpp11\emutls.c(145): error: #20: identifier “_ATOMIC_RELEASE” is undefind
```
不知有没有朋友们碰到过这个问题吗？想知道怎么解决的，感谢！！！

![RT5.jpg](https://oss-club.rt-thread.org/uploads/20221014/9ad3f0d2a1a2ad1664ee7a1df007ed5b.jpg.webp "RT5.jpg")
![RT6.jpg](https://oss-club.rt-thread.org/uploads/20221014/44ec11afee24b45723892337077dbf6c.jpg.webp "RT6.jpg")
![RT7.jpg](https://oss-club.rt-thread.org/uploads/20221014/29fb428fb63206fcf2d3d31c91ef7bb8.jpg.webp "RT7.jpg")

3 个回答

大波丁 2022-10-14

一只爱玩的程序猿

ORU6X1 2022-10-14

这家伙很懒，什么也没写！

ORU6X1 2022-10-17

这家伙很懒，什么也没写！

非常感谢您的回复，我现在试了 RT-Thread studio ,但是我开启C++ 11的时候也报了好多错误,不知道你用的时候碰到没有，如果有的话是怎么解决的,感谢。

![RT8.png](https://oss-club.rt-thread.org/uploads/20221017/73153e1c0f18caa6b0bd4630c920b139.png "RT8.png")

```c
<command-line>:0:0: note: this is the location of the previous definition
In file included from ../rt-thread/components/libc/cplusplus/cpp11/gcc/mutex:9:0,
                 from ../rt-thread/components/libc/cplusplus/cpp11/gcc/mutex.cpp:11:
D:\RT-ThreadStudio\workspace\test\rt-thread\components\libc\posix\pthreads/pthread.h:27:43: error: could not convert '0' from 'int' to 'rt_mutex'
 #define PTHREAD_MUTEX_INITIALIZER   {-1, 0}
                                           ^
../rt-thread/components/libc/cplusplus/cpp11/gcc/mutex:28:38: note: in expansion of macro 'PTHREAD_MUTEX_INITIALIZER'
             __native_type _m_mutex = PTHREAD_MUTEX_INITIALIZER;
                                      ^
In file included from ../rt-thread/components/libc/cplusplus/cpp11/gcc/mutex.cpp:11:0:
../rt-thread/components/libc/cplusplus/cpp11/gcc/mutex:39:23: error: explicitly defaulted function 'constexpr std::mutex::mutex()' cannot be declared as constexpr because the implicit declaration is not constexpr:
             constexpr mutex() = default;
                       ^
../rt-thread/components/libc/cplusplus/cpp11/gcc/mutex:36:11: error: use of deleted function 'constexpr std::__mutex_base::__mutex_base()'
     class mutex : private __mutex_base
           ^
../rt-thread/components/libc/cplusplus/cpp11/gcc/mutex:30:23: note: 'constexpr std::__mutex_base::__mutex_base() noexcept' is implicitly deleted because its exception-specification does not match the implicit exception-specification 'noexcept (false)'
             constexpr __mutex_base() noexcept = default;                      ^
```