C++ 链接器错误：未定义对符号“pthread_rwlock_trywrlock@@GLIBC_2.2.5”的引用
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Linker error: undefined reference to symbol 'pthread_rwlock_trywrlock@@GLIBC_2.2.5'
提问by segfault
I've been developing with CentOS, Qt 4.7, and GCC 4.4
我一直在使用 CentOS、Qt 4.7 和 GCC 4.4 进行开发
I've just installed Red Hat Developer Toolset 1.1 which includes GCC 4.7.2, and at the end of make, I get an error
我刚刚安装了包含 GCC 4.7.2 的 Red Hat Developer Toolset 1.1，并且在最后make，我收到一个错误
/usr/bin/ld: ../../bin/Solo: undefined reference to symbol 'pthread_rwlock_trywrlock@@GLIBC_2.2.5'
/usr/bin/ld: note: 'pthread_rwlock_trywrlock@@GLIBC_2.2.5' is defined in DSO /lib64/libpthread.so.0 so try adding it to the linker command line
/lib64/libpthread.so.0: could not read symbols: Invalid operation
collect2: error: ld returned 1 exit status
I'm guessing that Qt threads is referencing to that. How can I fix it?
我猜 Qt 线程正在引用它。我该如何解决？
回答by Ben Hymanson
You want to compile with -pthreadwhich does more than just link with libpthread:
你想用-pthreadwhich编译不仅仅是与 libpthread 链接：
Adds support for multithreading with the pthreads library. This option sets flags for both the preprocessor and linker.
使用 pthreads 库添加对多线程的支持。此选项为预处理器和链接器设置标志。
回答by cmannett85
You just need to add CONFIG += threadto your .profile.
您只需要添加CONFIG += thread到您的.pro文件中。
回答by lmns
Read the note: try to add /lib64/libpthread.so.0into Makefile (-lpthreadafter gcccommand, or /lib64/libpthread.so.0after ld(or after gcc -shared)), or something like LIB += -lpthreadif there's such definition somewhere.
阅读注释：尝试添加/lib64/libpthread.so.0到 Makefile （-lpthread在gcc命令之后，或/lib64/libpthread.so.0之后ld（或之后gcc -shared）），或者类似的东西，LIB += -lpthread如果某处有这样的定义。
See also: Adding external library into Qt Creator projectand http://www.qtcentre.org/threads/39144-How-to-add-a-lib-to-a-qt-project
另请参阅：将外部库添加到 Qt Creator 项目和http://www.qtcentre.org/threads/39144-How-to-add-a-lib-to-a-qt-project
Btw, post your Makefile, so somebody will be able to point to exact line.
顺便说一句，发布您的 Makefile，以便有人能够指出确切的行。
回答by George Moraitis
In my little laptop Linux (where I have a mixed bag of libraries), I just had to add
在我的小型笔记本电脑 Linux（我有一大堆库）中，我只需要添加
LDFLAGS=-lpthread
AT THE END of the configure command arguments.
在配置命令参数的末尾。
After that, make did its job perfectly (With the existing libraries).
在那之后， make 完美地完成了它的工作（使用现有的库）。
回答by denrad
I received similar 'Linker error: undefined reference to symbol' errors attempting to compile and install Python-3.7.2 on FreeBSD 12.
我在尝试在 FreeBSD 12 上编译和安装 Python-3.7.2 时收到类似的“链接器错误：未定义对符号的引用”错误。
/usr/bin/ld: error: undefined symbol: _Py_GetGlobalVariablesAsDict
/usr/bin/ld: error: undefined symbol: _PyCoreConfig_AsDict
/usr/bin/ld: error: undefined symbol: _PyMainInterpreterConfig_AsDict
Resolved by passing LDFLAGS=-lpthreaddirectly to make of lang/python37 or by adding to /etc/make.conf.
If using portmaster to install/update use -mto pass the arguement to make e.g.portmaster -a -m 'LDFLAGS=-lpthread'
通过LDFLAGS=-lpthread直接传递给 make of lang/python37 或通过添加到/etc/make.conf. 如果使用 portmaster 来安装/更新使用-m传递论证来使例如portmaster -a -m 'LDFLAGS=-lpthread'
