I am currently trying to use OpenCV in a Qt project. When I build it, i get the error:
error: 'opencv2/opencv.hpp' file not found
#include <opencv2/opencv.hpp>
I know that there are many similar questions out there in the web, but none of the answers was actually able to fix my problem so far.
My specifications:
Qt 5.4.0 (Clang 6.0 (Apple), 64 bit)
Mac OSX 10.10.1
OpenCV 2.4.9 installed from homebrew
My .pro file looks like this:
QT += core gui multimedia multimediawidgets
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = MainProject
TEMPLATE = app
SOURCES += main.cpp mainwindow.cpp
HEADERS += mainwindow.h
FORMS += mainwindow.ui
INCLUDEPATH += /usr/local/include/opencv2
LIBS += -L/usr/local/lib
LIBS += -lopencv_core
LIBS += -lopencv_imgproc
LIBS += -lopencv_highgui
LIBS += -lopencv_ml
LIBS += -lopencv_video
LIBS += -lopencv_features2d
LIBS += -lopencv_calib3d
LIBS += -lopencv_objdetect
LIBS += -lopencv_contrib
LIBS += -lopencv_legacy
LIBS += -lopencv_flann
I made sure the links actually link to the right locations. All the header files and all the .dylib files are there as well. I checked the type of the libraries:
$ file libopencv_core.dylib
libopencv_core.dylib: Mach-O 64-bit dynamically linked shared library x86_64
In my project settings, the qmake command is:
qmake: qmake MainProject.pro -r -spec macx-clang CONFIG+=debug CONFIG+=x86_64
Unfortunately I only have a basic understanding of these compile-things, so I am not too sure, whether it has something to do with clang? I read something about clang behaving somehow different on OSX 10.10 Yosemite, but I did not completely understand why. Info about my clang:
$ clang --version
Apple LLVM version 6.0 (clang-600.0.56) (based on LLVM 3.5svn)
Target: x86_64-apple-darwin14.0.0
Thread model: posix
I also tried to use the gcc-kit in Qt (GCC x86 64bit in /usr/bin), but this messed up a lot more, which I did not understand.
Does somebody have an idea what I am doing wrong? Any help appreciated!
Patrick
You are already including the directory opencv2 in your #include statement. You should change your include path to just INCLUDEPATH += /usr/local/include.
Related
Good day. I am trying to set up my Qt Creator to use Magick++. I've added
INCLUDEPATH += /usr/local/Cellar/imagemagick/7.0.8-23/include/ImageMagick-7
And that sort of worked, I can now add
#include <Magick++.h>
It does autocomplete and everything. But I get a lot of warnings that I am supposed to set MAGICKCORE_QUANTUM_DEPTH and MAGICKCORE_HDRI_ENABLE to sensible values. I have no idea what it is and how to do it. I've tried to research this topic but only found that I need to add Lib files like this:
QMAKE_CXXFLAGS += $(shell Magick++-config --cppflags --cxxflags)
LIBS += $(shell Magick++-config --ldflags --libs)
but that only added an error: :-1: error: Magick++-config: Command not found
I am using the latest version of Qt creator. ImageMagick-7. Mac OSX Mojave
Both MAGICKCORE_QUANTUM_DEPTH & MAGICKCORE_HDRI_ENABLE must be added to qmake's DEFINES variable.
Try the following...
QMAKE_CXXFLAGS += $(shell Magick++-config --cxxflags)
LIBS += $(shell Magick++-config --libs)
DEFINES += "MAGICKCORE_QUANTUM_DEPTH=16"
DEFINES += "MAGICKCORE_HDRI_ENABLE=1"
... assuming you are running ImageMagick-7 Q16 HDRI library.
Problem
I am having an issue implementing the g++48 compiler in QT Creator. I built this compiler using MacPorts. It appears that QT Creator ignores my compiler and defaults xcode g++42. How do I properly setup the compiler to override this?
Troubleshooting
Did you install gcc/g++ correctly and is it the main one selected?
I have ensured that gcc was installed correctly and the path is correct by doing the follows:
:~ which gcc:
/opt/local/bin/g++
:~ g++ --version:
g++ (MacPorts gcc48 4.8.1_3) 4.8.1
What system are you using?
My system: Mac OSX 10.9 Mavericks. QT Creator 2.8.1 Based on QT 5.1.0.
Toolchain setup: In QT Creator I specified the custom GCC compiler by going Compilers_Add_GCC and putting in the compiler path /opt/local/bin/g++. If I hover the mouse over any of the #include lines in *.cpp then it properly displays the path /opt/local/include/gcc48/{headerName}. I suspect the problem is related to the QT Mkspecs, but I really don't understand what this is or how to write a custom one for my custom gcc installation (if necessary). Can this be explained?
Kit updated in QT Creator? The kit was updated by following the directions that here: Qt Creator use another GCC Version located in another Place
Why do you suspect g++42 is being used? This is based on the results I get from inspecting the build log file.
12:30:19: Running steps for project untitled...
12:30:19: Configuration unchanged, skipping qmake step.
12:30:19: Starting: "/usr/bin/make"
/Applications/Xcode.app/Contents/Developer/usr/bin/g++ -c -pipe -std=c++11 -g -gdwarf-2 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk -mmacosx-version-min=10.6 -Wall -W -fPIE -DQT_QML_DEBUG -DQT_DECLARATIVE_DEBUG -I/Users/raymondvaldes/Qt/5.1.0/clang_64/mkspecs/macx-g++ -I/Users/raymondvaldes/Documents/code/untitled -I. -o main.o /Users/raymondvaldes/Documents/code/untitled/main.cpp
/Users/raymondvaldes/Documents/code/untitled/main.cpp:4:10: fatal error: 'random' file not found
#include <random>
^
1 error generated.
make: *** [main.o] Error 1
12:30:20: The process "/usr/bin/make" exited with code 2.
Error while building/deploying project untitled (kit: gcc48)
When executing step 'Make'
12:30:20: Elapsed time: 00:01.
and
RAYMONDs-MacBook-Air:~ raymondvaldes$ /Applications/Xcode.app/Contents/Developer/usr/bin/g++ --version
Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 5.0 (clang-500.2.79) (based on LLVM 3.3svn)
Target: x86_64-apple-darwin13.0.0
Thread model: posix
Finally, here is my simple working example:
#include <iostream>
#include <complex>
#include <cmath>
#include <random>
int main()
{
std::cout << "Hello World!" << std::endl;
return 0;
}
and my pro file.
cache()
TEMPLATE = app
CONFIG += console
CONFIG -= app_bundle
CONFIG -= qt
QMAKE_CXXFLAGS += -std=c++11
SOURCES += main.cpp
Thank you.
I finally solved this issue and I am now able to use my MacPorts GCC48 compiler in QT Creator. As I suspected I needed to create a gcc48 mkspecs folder in the QT Directory and feed the folder name to the QT Creator custom compiler setup screen. I created "macs-g++48" folder that was copied from the generic "macs-g++" folder in "~path~QT/5.1.x/clang_64/mkspecs". I had to modify qmake.conf. I commented out
#include(../common/g++-macx.conf)
#include(g++-base.conf)
and placed their contents within quake.conf while making the following modifications:
QMAKE_CC = gcc-mp-4.8
QMAKE_CXX = g++-mp-4.8
I'm on OS X 10.8.4 (Mountain Lion) with the latest command line tools from Xcode. I'm trying to build a Qt project (in Qt Creator) which uses some C++11 features; notably std::unique_ptr. Whenever I try building though, I get the following error:
clang: error: invalid deployment target for -stdlib=libc++ (requires OS X 10.7 or later)
My .pro file is as follows:
QT += core gui
QMAKE_CXXFLAGS += -mmacosx-version-min=10.7 -std=c++11 -stdlib=libc++
LIBS += -mmacosx-version-min=10.7 -stdlib=libc++
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = APPNAME
TEMPLATE = app
SOURCES += main.cpp\
mainwindow.cpp
HEADERS += mainwindow.h
FORMS += mainwindow.ui
cache()
I've tried the solutions presented in other answers (see here and the top answer here), neither of which seemed to work.
According to this site add
CONFIG += c++11
to your .pro file (see at the bottom of that web page). It requires Qt 5.
UPDATE: As for Qt 4, see How to enable C++11 in Qt Creator?
I've created a basic app in visual studio with Qt and an openGL widget. I export a .pro file from the addin so that I can compile in Linux.
I get the message:
/usr/bin/ld: cannot find -lopengl32
/usr/bin/ld: cannot find -lglu32
... when running make.
The issue goes away and the program compiles fine if I remove:
LIBS += -lopengl32 \
-lglu32
... from the generated .pro file.
I understand the "export .pro" feature is not flawless, but is this the correct way to fix this problem?
I don't quite remember the exact name of the OpenGL library on Linux, but it's not opengl32. Rather libopengl. So it's perfectly normal.
This will make you link with opengl32.lib on windows only:
win32 : LIBS += -lopengl32 -lglu32
and if needed, this will make you link with libopengl on Linux :
unix : LIBS += -lopengl -lglu
For the macx platform scope, I guess there is additional work to link with the OpenGL Framework.
I have a Qt project and i wanted to use google tests framework GoogleTestFramework in order to do google test. The framework compiled fine on Linux.
I have managed to compile the libraries on windows, using tips provided in the following link:
Installing Gtest without pthreads
The following advice do not let me compile the libraries, because of errors due to pthreads:
Sackoverflow compiling with MSYS
I have :
GNU Make 3.81 for make.exe
GNU Make 3.82 for mingw32-make
CMake 2.8.7
QT 4.7.4
Qt MingW gcc v 4.4.0
When i try to compile my test projet, i get an error saying:
undefined reference to '__chkstk_ms'
File not found: gtest-all.cc
Here is my qmake project code (I have semplified the code).
QT += core gui
DEPENDPATH += . headers src ../FastTrans/headers ../FastTrans/src ../FastTrans/forms C:/MinGW/msys/1.0/home/zakharan/gtest-1.6.0/include
INCLUDEPATH += . headers src ../FastTrans/headers ../FastTrans/src ../FastTrans/forms C:/MinGW/msys/1.0/home/zakharan/gtest-1.6.0/include
TARGET = tstall
#CONFIG += console
#CONFIG -= app_bundle
TEMPLATE = app
HEADERS += ../FastTrans/headers/shortcutsactionsitem.h \
../FastTrans/headers/shortcutsactionsmodel.h \
../FastTrans/headers/isavesettings.h
SOURCES += ../FastTrans/src/shortcutsactionsitem.cpp \
../FastTrans/src/shortcutsactionsmodel.cpp \
../FastTrans/src/isavesettings.cpp \
src/tstshortcutsactionsitem.cpp \
src/tstshortcutsactionmodel.cpp
INCLUDEPATH += $$PWD/
DEPENDPATH += $$PWD/
win32: LIBS += C:/MinGW/msys/1.0/home/zakharan/gtest-1.6.0/mybuid/libgtest.a
win32: LIBS += C:/MinGW/msys/1.0/home/zakharan/gtest-1.6.0/mybuid/libgtest_main.a
Google recommends the following for compiling in Windows:
### Windows Requirements ###
* Microsoft Visual C++ 7.1 or newer
### Cygwin Requirements ###
* Cygwin 1.5.25-14 or newer
I've heard of some people using MingW for compiling this. Supposedly compiling with MingW can be a little faster because there doesn't need to be a comparability layer between the OS and the application.
But, since this is just for dev testing purposes Cygwin should suffice. Just download the version that Google recommends.
See Also:
Compile Cygwin project in Eclipse
How Cygwin compares to MingW for porting Linux applications to Windows