std::atomic::is_lock_free编译器说找不到符号

cdsfiui

1. 
   

复制代码

1. 
   
2. #include<iostream>
   
3. #include<atomic>
   
4. 
   
5. struct A { int a[4]; };
   
6. struct B { int x, y; };
   
7. int main()
   
8. {
   
9.     std::cout << std::boolalpha
   
10.             << "std::atomic<A> is lock free? "
    
11.             << std::atomic<A>{}.is_lock_free() << '\n'
    
12.             << "std::atomic<B> is lock free? "
    
13.             << std::atomic<B>{}.is_lock_free() << '\n';
    
14. }
    
15. 
    

复制代码

就上面这一点代码:
clang++ -std=c++11编译:

1. 
   
2. Undefined symbols for architecture x86_64:
   
3. "___atomic_is_lock_free", referenced from:
   
4.     _main in atomics.o
   
5. ld: symbol(s) not found for architecture x86_64
   
6. clang: error: linker command failed with exit code 1 (use -v to see invocation)
   

复制代码

g++4.8.5编译:

1. 
   
2. /tmp/ccvfzqdw.o: In function `std::atomic<A>::is_lock_free() const':
   
3. 1.cpp:(.text._ZNKSt6atomicI1AE12is_lock_freeEv[_ZNKSt6atomicI1AE12is_lock_freeEv]+0x17): undefined reference to `__atomic_is_lock_free'
   
4. collect2: error: ld returned 1 exit status
   

复制代码

难道还需要连接额外的库吗?

VIP_fuck

哥，你先看看你头文件对不对，