外部库在Qt Creator中引发未定义的参考错误 [英] External library throws undefined reference errors in Qt Creator

问题描述

我在使用外部库/SDK时遇到一些问题. 我正在Ubuntu和Oculus Rift SDK下使用Qt Creator. Oculus Rift SDK由依赖于平台的lib文件和一些c ++源代码组成.请注意，我非常怀疑我的问题在任何方面都是Oculus SDK或Xinerama所特有的.

I have some problems with using an external library/SDK. I am using Qt Creator under Ubuntu with the Oculus Rift SDK. The Oculus Rift SDK consists of a platform dependent lib file and some c++ source code. Note that I highly doubt my problem is in any way specific to the Oculus SDK or Xinerama.

我使用向导并将SDK添加为外部库.结果就是这样:

I used the wizard and added the SDK as an external library. This was the result:

unix:!macx: LIBS += -L$$PWD/../OculusSDK/LibOVR/Lib/Linux/Release/x86_64/ -lovr
INCLUDEPATH += $$PWD/../OculusSDK/LibOVR/Include
DEPENDPATH += $$PWD/../OculusSDK/LibOVR/Include
unix:!macx: PRE_TARGETDEPS += $$PWD/../OculusSDK/LibOVR/Lib/Linux/Release/x86_64/libovr.a

现在，我应该可以从SDK调用方法了.但是，这是我在编译时遇到的错误之一:

Now I should be able to call methods from the SDK. However, this is one of the errors I get while compiling:

/home/me/OculusSDK/LibOVR/Lib/Linux/Release/x86_64/libovr.a(OVR_Linux_HMDDevice.o):-1: In function `OVR::Linux::HMDDeviceFactory::EnumerateDevices(OVR::DeviceFactory::EnumerateVisitor&)':
OVR_Linux_HMDDevice.cpp:-1: error: undefined reference to `XineramaIsActive'

我已经尝试过将此行添加到我的.pro文件中，但没有做任何更改:

I already tried adding this line to my .pro file but nothing changed:

unix:LIBS += -lXinerama

如果我包含与OVR_Linux_HMDDevice.cpp完全相同的头文件，

If I include the very same header file as OVR_Linux_HMDDevice.cpp does,

#include <X11/extensions/Xinerama.h>

我可以从我的代码中成功调用XineramaIsActive.因此，显然，只有外部源代码才能访问该方法.

I can successfully call XineramaIsActive from my code. So apparently, it's just the external source code that has issues accessing the method.

有什么想法我需要对构建过程进行哪些更改才能使其正常工作?

Any ideas what changes I have to make to the build process for this to work?

推荐答案

此处的链接顺序很重要.您需要确保在-lovr选项之后 之后添加-lXinerama选项.当您将它们添加到.pro文件中时，qmake应该保留它们的顺序.

Link order is important here. You need to make sure the -lXinerama option is added after the -lovr option. qmake should preserve the order of libraries as you add them in your .pro file.

有关更多信息，请参见此答案信息.

See this answer for more information.

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