环境:Mac OS 10.9 + Qt5.1/Qt5.2 + OpenCV2.4.7 + XCode(5.0.2)
我可以通过终端编译下面的程序
g++ -L/usr/local/lib -lopencv_core -lopencv_highgui \
-I/usr/local/include main.cpp
程序a.out正常运行。
但是,当使用Qt 5.1/5.2运行这个OpenCV程序时, 我得到了“体系结构 x86_64 的 undefined symbol ”。
但是,对于简单的 HelloWorld c++ 程序,Qt5 可以正常工作。
这是怎么回事?
这是代码。
#include <iostream>
#include "opencv2/highgui/highgui.hpp"
using namespace std ;
using namespace cv ;
int main()
{
Mat img ;
img = imread("image.jpg") ;
return 0;
}
这是项目设置
INCLUDEPATH += /usr/local/include
LIBS += -L/usr/local/lib
LIBS += -lopencv_core -lopencv_highgui -v
cache()
TEMPLATE = app
CONFIG += console
CONFIG -= app_bundle
CONFIG -= qt
SOURCES += main.cpp
这是编译信息
/Users/XXX/Qt5.2.0/5.2.0-beta1/clang_64/bin/qmake -spec macx-clang CONFIG+=debug -o Makefile /Users/XXX/Desktop/untitled/untitled.pro
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ -headerpad_max_install_names -Wl,-syslibroot
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk -mmacosx-version-min=10.6 -o untitled main.o -L/usr/local/lib -lopencv_core -lopencv_highgui -v
用-v显示调用
Apple LLVM version 5.0 (clang-500.2.79) (based on LLVM 3.3svn)
Target: x86_64-apple-darwin13.0.0
Thread model: posix
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld" -demangle -dynamic -arch x86_64 -headerpad_max_install_names -macosx_version_min 10.6.0 -o untitled -lcrt1.10.6.o -L/usr/local/lib -syslibroot
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk main.o -lopencv_core -lopencv_highgui -lstdc++ -lSystem
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/clang/5.0/lib/darwin/libclang_rt.osx.a
这是错误信息
Undefined symbols for architecture x86_64:
"cv::imread(std::string const&, int)", referenced from:
_main in main.o
.... and so on
我检查过这个问题与-lstdc++
或-std=c++11
或-stdlib=libstdc++
无关。
通过使用命令行编译。
有什么想法或建议吗?
最佳答案
这个问题在这篇文章中得到了解答
http://qt-project.org/forums/viewthread/35646/
并由 sandy.martel 解释
我在这里引用
Qt binary distribution compile with -stdlib=libstdc++ to be compatible with 10.6, Xcode 5 on 10.9 will select -stdlib=libc++ by default (for OS X 10.7 and better only). So symbol using classes from the standard library (like std::string in this case) will not resolve correctly at link time. This is why you’re seeing this error (Undefined symbols for architecture x86_64) . Look with which standard library opencv is built: otool -L libopencv_XXX.dylib. You’ll have to rebuild it with the right one or change Qt’s mkspec to use the newer one.
我通过更改 ../Qt5.2.0/5.2.0-rc1/clang_64/mkspecs/macx-clang/qmake.conf 解决了这个问题
来自
QMAKE_MACOSX_DEPLOYMENT_TARGET = 10.6
到
QMAKE_MACOSX_DEPLOYMENT_TARGET = 10.9
并记住在重建之前清理您的项目。
关于macos - Qt5.1/Qt5.2 + Mac OS 10.9 (Mavericks) + XCode 5.0.2,架构 x86_64 的 undefined symbol ,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/20342896/