在MingW下编译简单的pthread代码时出现链接器错误 [英] Linker errors in compiling a simple pthread code under MingW

问题描述

我正在尝试编译一个c ++源文件test.cpp，它具有一个非常简单的代码来演示pthread_create();. pthread_cond_signal/pthread_cond_wait()功能.

I am trying to compile a single c++ source file test.cpp, which has a very simple code which demonstrates pthread_create(); pthread_cond_signal/pthread_cond_wait() functionality.

我在工作的Windows XP上安装了Mingw/Ansys.在MingW提示符下，我这样做:

I have installed Mingw / Ansys on Windows XP where I am working. In the MingW prompt I do:

g++ -IC:/MinGW/include/ -lpthread test.cpp 
//-IC:/MinGW/include to get pthread.h
//-LC:/MinGW/bin to get pthreadGC2.dll

cpp包含pthread.h为:

The cpp includes pthread.h as:

#include <pthread.h>

但这给了我所有pthread库函数多个链接器未定义的引用错误.

But this gave me multiple linker undefined reference errors to all pthread library functions.

我在这里做错了什么.是否可以在Windows的MingW环境上构建pthread代码?

What am I doing wrong here. Is it possible to build a pthread code on MingW environment on windows or not?

如何解决此错误?

C:\DOCUME~1\ADESHP~1\LOCALS~1\Temp\ccUQhu7D.o:pthread_cond.c:(.text+0x23): undefined reference to `_imp__pthread_mutex_lock'
C:\DOCUME~1\ADESHP~1\LOCALS~1\Temp\ccUQhu7D.o:pthread_cond.c:(.text+0x67): undefined reference to `_imp__pthread_cond_signal'
C:\DOCUME~1\ADESHP~1\LOCALS~1\Temp\ccUQhu7D.o:pthread_cond.c:(.text+0x75): undefined reference to `_imp__pthread_mutex_unlock'
C:\DOCUME~1\ADESHP~1\LOCALS~1\Temp\ccUQhu7D.o:pthread_cond.c:(.text+0x98): undefined reference to `_imp__pthread_exit'
C:\DOCUME~1\ADESHP~1\LOCALS~1\Temp\ccUQhu7D.o:pthread_cond.c:(.text+0xbc): undefined reference to `_imp__pthread_mutex_lock'
C:\DOCUME~1\ADESHP~1\LOCALS~1\Temp\ccUQhu7D.o:pthread_cond.c:(.text+0xe8): undefined reference to `_imp__pthread_cond_wait'
C:\DOCUME~1\ADESHP~1\LOCALS~1\Temp\ccUQhu7D.o:pthread_cond.c:(.text+0x10f): undefined reference to `_imp__pthread_mutex_unlock'
C:\DOCUME~1\ADESHP~1\LOCALS~1\Temp\ccUQhu7D.o:pthread_cond.c:(.text+0x135): undefined reference to `_imp__pthread_exit'
C:\DOCUME~1\ADESHP~1\LOCALS~1\Temp\ccUQhu7D.o:pthread_cond.c:(.text+0x153): undefined reference to `_imp__pthread_attr_init'
C:\DOCUME~1\ADESHP~1\LOCALS~1\Temp\ccUQhu7D.o:pthread_cond.c:(.text+0x169): undefined reference to `_imp__pthread_mutex_init'
C:\DOCUME~1\ADESHP~1\LOCALS~1\Temp\ccUQhu7D.o:pthread_cond.c:(.text+0x17f): undefined reference to `_imp__pthread_attr_setdetachstate'
C:\DOCUME~1\ADESHP~1\LOCALS~1\Temp\ccUQhu7D.o:pthread_cond.c:(.text+0x195): undefined reference to `_imp__pthread_cond_init'
C:\DOCUME~1\ADESHP~1\LOCALS~1\Temp\ccUQhu7D.o:pthread_cond.c:(.text+0x1bc): undefined reference to `_imp__pthread_create'
C:\DOCUME~1\ADESHP~1\LOCALS~1\Temp\ccUQhu7D.o:pthread_cond.c:(.text+0x1e3): undefined reference to `_imp__pthread_create'
C:\DOCUME~1\ADESHP~1\LOCALS~1\Temp\ccUQhu7D.o:pthread_cond.c:(.text+0x201): undefined reference to `_imp__pthread_join'
C:\DOCUME~1\ADESHP~1\LOCALS~1\Temp\ccUQhu7D.o:pthread_cond.c:(.text+0x21f): undefined reference to `_imp__pthread_join'
C:\DOCUME~1\ADESHP~1\LOCALS~1\Temp\ccUQhu7D.o:pthread_cond.c:(.text+0x239): undefined reference to `_imp__pthread_mutex_destroy'
C:\DOCUME~1\ADESHP~1\LOCALS~1\Temp\ccUQhu7D.o:pthread_cond.c:(.text+0x247): undefined reference to `_imp__pthread_cond_destroy'
C:\DOCUME~1\ADESHP~1\LOCALS~1\Temp\ccUQhu7D.o:pthread_cond.c:(.text+0x255): undefined reference to `_imp__pthread_attr_destroy'
C:\DOCUME~1\ADESHP~1\LOCALS~1\Temp\ccUQhu7D.o:pthread_cond.c:(.text+0x263): undefined reference to `_imp__pthread_exit'
collect2: ld returned 1 exit status

推荐答案

您需要在依赖于库的文件之后的gcc/g ++命令行上指定库.因此，尝试:

You need to specify the library on the gcc/g++ command line after the files that depend on the library. So try:

g++ -IC:/MinGW/include/ test.cpp -lpthread

当我偶然发现答案时，我被踢了一下(这是一种针对库和gcc的常见问题解答).对于大多数gcc选项而言，顺序并不重要，但对于库而言，这很关键.

I kicked myself when I stumbled on the answer (it's kind of a FAQ for libraries and gcc). For most gcc options order doesn't matter, but for libraries it's critical.

如果您的MinGW发行版随附了pthread库，则不必指定库路径(这似乎是您的情况).另外，请记住，上面的命令行将生成一个a.exe可执行文件.通过-o test.exe可以避免这种情况.

You should not have to specify the library path if the pthread library came with your MinGW distribution (as it seems is the case for you). Also, remember that the command line above will produce an a.exe executable; pass -o test.exe to avoid that.

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