问题
I have some troubles trying to compile a program with multi-threading from the standard template library. It return me a obscure error when i try to compile the following program :
#include <iostream>
#include <thread>
void foo()
{
std::cout << "Thread 1\n";
}
int main(int argc, char** argv)
{
std::thread tr(foo);
std::cout << "Main thread\n";
tr.join();
return 0;
}
I don't understand the error :
/tmp/ccE8EtL1.o : In the function « std::thread::thread<void (&)()>(void (&)()) » :
file.cpp:(.text._ZNSt6threadC2IRFvvEJEEEOT_DpOT0_[_ZNSt6threadC5IRFvvEJEEEOT_DpOT0_]+0x21) : undefined reference to « pthread_create »
collect2: error : ld has return 1 execution status code
I compile it with :
g++ -std=c++14 file.cpp -o test -Wall
Can anyone help me please ?
回答1:
Pass -pthread
to the compiler. This flag combines what is necessary to compile and link the pthread library (-lpthread is not always enough). See this question.
来源:https://stackoverflow.com/questions/42046569/issue-with-stdthread-from-c11