在MingW下编译简单的pthread代码时链接器错误

Question

我正在尝试编译单个c ++源文件test.cpp,它有一个非常简单的代码,演示了pthread_create(); pthread_cond_signal/pthread_cond_wait()功能.

我在Windows XP上安装了Mingw/Ansys,我正在工作.在MingW提示符中我做:

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

cpp包括pthread.h:

#include <pthread.h>

但这给了我所有pthread库函数的多个链接器未定义的引用错误.

我在这做错了什么.是否可以在Windows上的MingW环境中构建pthread代码？

如何解决这个错误？

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

Answer 1

您需要在依赖于库的文件之后在gcc/g ++命令行上指定库.所以尝试:

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

当我偶然发现答案时,我踢了自己(这是图书馆和gcc的常见问题解答).对于大多数gcc选项,顺序无关紧要,但对于库而言,这是至关重要的.

如果pthread库附带了MinGW发行版,则不必指定库路径(因为您似乎就是这种情况).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以避免这种情况.