在 Linux 中对 pthread_create 的未定义引用
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Undefined reference to pthread_create in Linux
提问by Ralph
I picked up the following demo off the web from https://computing.llnl.gov/tutorials/pthreads/
我从https://computing.llnl.gov/tutorials/pthreads/摘取了以下演示
#include <pthread.h>
#include <stdio.h>
#define NUM_THREADS 5
void *PrintHello(void *threadid)
{
long tid;
tid = (long)threadid;
printf("Hello World! It's me, thread #%ld!\n", tid);
pthread_exit(NULL);
}
int main (int argc, char *argv[])
{
pthread_t threads[NUM_THREADS];
int rc;
long t;
for(t=0; t<NUM_THREADS; t++){
printf("In main: creating thread %ld\n", t);
rc = pthread_create(&threads[t], NULL, PrintHello, (void *)t);
if (rc){
printf("ERROR; return code from pthread_create() is %d\n", rc);
exit(-1);
}
}
pthread_exit(NULL);
}
But when I compile it on my machine (running Ubuntu Linux 9.04) I get the following error:
但是当我在我的机器上编译它（运行 Ubuntu Linux 9.04）时，我收到以下错误：
corey@ubuntu:~/demo$ gcc -o term term.c
term.c: In function ‘main':
term.c:23: warning: incompatible implicit declaration of built-in function ‘exit'
/tmp/cc8BMzwx.o: In function `main':
term.c:(.text+0x82): undefined reference to `pthread_create'
collect2: ld returned 1 exit status
This doesn't make any sense to me, because the header includes pthread.h, which should have the pthread_createfunction. Any ideas what's going wrong?
这对我来说没有任何意义，因为标题包括pthread.h，它应该具有该pthread_create功能。任何想法出了什么问题？
回答by Employed Russian
Both answers to this question so far are incorrect.
For Linux the correct command is:
到目前为止，这个问题的两个答案都不正确。
对于 Linux，正确的命令是：
gcc -pthread -o term term.c
In general, libraries should follow sources and objects on command line, and -lpthreadis not an "option", it's a library specification. On a system with only libpthread.ainstalled,
一般来说，库应该在命令行上遵循源和对象，而-lpthread不是一个“选项”，它是一个库规范。在仅libpthread.a安装的系统上，
gcc -lpthread ...
will fail to link.
将无法链接。
回答by xiaolong
You need to use the option -lpthreadwith gcc.
您需要在-lpthreadgcc 中使用该选项。
回答by sam
you need only Add "pthread" in proprieties=>C/C++ build=>GCC C++ Linker=>Libraries=> top part "Libraries(-l)". thats it
您只需要在proprieties=>C/C++ build=>GCC C++ Linker=>Libraries=> 顶部“Libraries(-l)”中添加“pthread”。就是这样
回答by sam
in eclipse
在日食
properties->c/c++Build->setting->GCC C++ linker->libraries in top part add "pthread"
属性->c/c++Build->setting->GCC C++ 链接器->顶部的库添加“pthread”
回答by naXa
In Anjuta, go to the Build menu, then Configure Project. In the Configure Options box, add:
在 Anjuta 中，转到 Build 菜单，然后选择 Configure Project。在配置选项框中，添加：
LDFLAGS='-lpthread'
Hope it'll help somebody too...
希望它也能帮助别人...
回答by user1793997
Sometimes, if you use multiple library, check the library dependency. (e.g. -lpthread -lSDL... <==> ... -lSDL -lpthread)
有时，如果您使用多个库，请检查库依赖项。（例如 -lpthread -lSDL... <==> ... -lSDL -lpthread）
回答by dylanninin
Acutally, it gives several examples of compile commands used for pthreads codes are listed in the table below, if you continue reading the following tutorial:
实际上，如果您继续阅读以下教程，它给出了用于 pthreads 代码的几个编译命令示例，如下表所示：
https://computing.llnl.gov/tutorials/pthreads/#Compiling
https://computing.llnl.gov/tutorials/pthreads/#Compiling
回答by leesagacious
Compile it like this : gcc demo.c -o demo -pthread
像这样编译它：gcc demo.c -o demo -pthread
回答by Jayhello
If you are using cmake, you can use:
如果您使用的是 cmake，则可以使用：
add_compile_options(-pthread)
Or
或者
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pthread")
回答by Alexander Nenartovich
Running from the Linux terminal, what worked for me was compiling using the following command (suppose the c file I want to compile is called test.c):
从 Linux 终端运行，对我有用的是使用以下命令进行编译（假设我要编译的 c 文件名为 test.c）：
gcc -o test test.c -pthread
Hope it helps somebody!
希望它可以帮助某人！
