mingw中的libpthread找不到库 [英] libpthread in mingw does not find the libraries

问题描述

我正在尝试使用mingw编译以下程序:

I am trying to compile the following program with mingw:

#include <pthread.h>
#include <errno.h>
#include <unistd.h>
#include <iostream>
#include <cstdio>

void *hello(void *id) {
  int nid = *static_cast<int*>(id);
  std::printf("Hello from thread %d\n", nid);
  return 0;
}

int main(int argc, char **argv) {
  pthread_t ids[2];
  int *params[2];
  for (int i = 0; i < 2; ++i) {
    params[i] = new int;
    *params[i] = i;
    pthread_create(&ids[i], 0, hello, params[i]);
  }
  for (int i = 0; i < 2; ++i)
    pthread_join(ids[i], 0);
  for (int i = 0; i < 2; ++i)
    delete params[i];
  return 0;
}

使用此命令:

g++ -lpthread -ohello.exe hello.cc

然后我收到以下消息:

C:\Users\XXXXXX~1\AppData\Local\Temp\cczPlv0w.o:hello.cc:(.text+0xad): undefined 
reference to `_imp__pthread_create'
C:\Users\XXXXXX~1\AppData\Local\Temp\cczPlv0w.o:hello.cc:(.text+0xe9): undefined 
reference to `_imp__pthread_join'
collect2: ld returned 1 exit status

但是使用MingGW的较旧版本，我可以毫无问题地运行pthreads程序. (这只是所有失败程序的简单操作，但基本上所有使用pthreads的程序都会遇到相同的错误，C和C ++)

But with an older version of MingGW I had no problems running pthreads programs. (This is just the simple of all the programs that failed, but basically everything that uses pthreads ends up with the same error, C and C++)

推荐答案

将-lpthread移至该命令的末尾:

g++ -ohello.exe hello.cc -lpthread

参数的顺序很重要. (实际上建议在整个链接中使用-pthread而不是-lpthread，因为它会为预处理器和链接器设置标志.)

The order of the arguments is important. (Using -pthread throughout instead of -lpthread for linking is actually recommended, since it sets flags both for the preprocessor and the linker.)

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