Qt未定义引用3rdparty软件库 [英] Qt undefined reference to 3rdparty software libraries

问题描述

我在我的Qt应用程序中使用第三方库函数，但它报告错误，如未定义引用bp_attach collect2：错误：ld返回1退出状态。 / p>

我已经从源代码生成第三方库（ion-dtn），并且 make make install 。我确定它已经在我的Ubuntu系统中成功安装。

我已经包括它的头文件bp.h和Qt不抱怨。但是当我编译我得到上面提到的错误。这是我的.pro文件：

  QT + = core gui 
 QT + = network 
 
 greaterThan（QT_MAJOR_VERSION，4）：QT + =小部件
 
 TARGET = MYUDP 
 TEMPLATE = app 
 
 INCLUDEPATH + = / usr / local / include / 
 LIBS + = -L / usr / local / lib 
 
 PKGCONFIG + = ion-d 
 SOURCES + = main.cpp \ 
 myudp。 cpp 
 
 HEADERS + = myudp.h 
 
 FORMS + = myudp.ui 
  

bp.h的路径，其中声明了bp_attach函数 /usr/local/include/bp.h 。

第三方库的libs安装在 / usr / local / lib 中，并在.pro中定义。

解决方案

虽然你告诉QMake在哪里找到头文件和库，你需要指定 which 图书馆需要链接。相当于 LDLIBS 的QMake为 LIBS ：

  INCLUDEPATH + = / usr / local / include 
 LIBS + = -lbp 
  

I using 3rd party library functions in my Qt application, but it's reporting errors such as "undefined reference to bp_attach collect2 : error: ld returned 1 exit status".

I have build 3rd party library (ion-dtn) from source code and did make & make install. I am certain that it has installed successfully in my Ubuntu system.

I have included its header file "bp.h" and Qt doesn’t complain about that. But when I compile I get the error mentioned above. Here is my .pro file:

QT       += core gui
QT       += network

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = MYUDP
TEMPLATE = app

INCLUDEPATH += /usr/local/include/
LIBS += -L /usr/local/lib

PKGCONFIG +=ion-d
SOURCES += main.cpp\
        myudp.cpp

HEADERS  += myudp.h

FORMS    += myudp.ui

Path of "bp.h" where bp_attach function is declared is /usr/local/include/bp.h.

Libs for 3rd party library are installed in /usr/local/lib and is defined in .pro.

解决方案

Although you have told QMake where to find the headers and the libraries, you need to specify which libraries need to be linked. The QMake equivalent to LDLIBS is LIBS:

INCLUDEPATH += /usr/local/include
LIBS += -lbp

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