Question

我试图在std::atomic<>中使用struct sigaction和std::vector但我的测试用例在Clang和GCC中都失败并出现链接器错误。这是为什么？我支持所有类型，甚至是非基本类型。

#include <atomic>
#include <vector>
#include <signal.h>

std::vector<std::atomic<struct sigaction> > vec (1);

int main() {
    struct sigaction sa = { };
    vec[0].store (sa);
    sa = vec[0].load ();
    return 0;
}

见http://coliru.stacked-crooked.com/a/df4cfcbe48ecc992。结果是

g++ -std=c++11 -O2 -Wall -pedantic -pthread main.cpp && ./a.out ; g++ -v 2>&1 |grep 'gcc version'
clang++ -std=c++11 -O2 -Wall -pedantic -pthread main.cpp && ./a.out ; clang++ -v 2>&1 |grep 'clang version'  
/tmp/ccgNkprP.o: In function `main':
main.cpp:(.text.startup+0x41): undefined reference to `__atomic_store'
main.cpp:(.text.startup+0x5f): undefined reference to `__atomic_load'
collect2: error: ld returned 1 exit status
gcc version 5.2.0 (GCC)
/tmp/main-c75098.o: In function `main':
main.cpp:(.text+0x96): undefined reference to `__atomic_store'
main.cpp:(.text+0xb1): undefined reference to `__atomic_load'
clang: error: linker command failed with exit code 1 (use -v to see invocation)
clang version 3.6.0 (tags/RELEASE_360/final 235480)

std :: atomic <struct sigaction =“”>不受支持？

0 个答案: