C++ 使用 pkg-config 输出将库链接到 QT 项目
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Linking libraries to a QT project using pkg-config output
提问by MVG
This is a bit of a newbie question. I am trying to add the OpenCV libraries to a QT project.
这是一个有点菜鸟的问题。我正在尝试将 OpenCV 库添加到 QT 项目中。
This questionsays the link flags are given by
这个问题说链接标志是由
pkg-config --libs opencv
If I paste the command line output into the project file like:
如果我将命令行输出粘贴到项目文件中，例如：
LIBS += -L/usr/local/lib -lml -lcvaux -lhighgui -lcv -lcxcore
then everything compiles fine, but now this isn't portable. How can I simply reference the output of the command?
然后一切都可以正常编译，但现在这不是可移植的。如何简单地引用命令的输出？
Update: Tried Ken Bloom's suggestion, but it won't compile. The actual generated compiler commands are
更新：尝试了 Ken Bloom 的建议，但无法编译。实际生成的编译器命令是
# How it should be, at least on my machine
g++ -o QOpenCVTest main.o qopencvtest.o moc_qopencvtest.o -L/usr/lib -L/usr/local/lib -lml -lcvaux -lhighgui -lcv -lcxcore -lQtGui -lQtCore -lpthread
# with CONFIG and PKGCONFIG
g++ -o QOpenCVTest main.o qopencvtest.o moc_qopencvtest.o -L/usr/lib -lQtGui -lQtCore -lpthread
回答by Ken Bloom
CONFIG += link_pkgconfig
PKGCONFIG += opencv
(I got this answer from http://beaufour.dk/blog/2008/02/using-pkgconfig.html)
（我从http://beaufour.dk/blog/2008/02/using-pkgconfig.html得到了这个答案）
回答by Salida Software
Ken's answer worked great. I just had to remove the spaces on either side of the += first.
肯的回答效果很好。我只需要先删除 += 两侧的空格。
CONFIG+=link_pkgconfig PKGCONFIG+=opencv
回答by nicomen
Something like this in your qmake file should do
在你的 qmake 文件中应该做这样的事情
LIBS += `pkg-config --libs opencv`
Edit: Hmm, Ken Bloom's answer might be more portable, but erhm not documented?
编辑：嗯，Ken Bloom 的答案可能更便携，但 erhm 没有记录？
回答by SteveEng
In the newer version of Qt, this needs to be done to avoid a package not found error:
在较新版本的 Qt 中，需要这样做以避免包未找到错误：
QT_CONFIG -= no-pkg-config
CONFIG += link_pkgconfig
PKGCONFIG += protobuf #or whatever package here
Also had to do this for Mac:
还必须为 Mac 执行此操作：
mac {
PKG_CONFIG = /usr/local/bin/pkg-config
}
回答by RawMean
Add the following lines to your .pro file:
将以下行添加到您的 .pro 文件中：
INCLUDEPATH += `pkg-config --cflags opencv`
LIBS += `pkg-config --libs opencv`
