I am in the exact situation described in this question (Qt Creator on Mac and boost libraries) but the accepted answer is not working for me. I've searched around and tried all the suggestions I've found but I still end up with errors
Environment:
OSX 10.9.5
Qt 5.5.1 - Qt Creator 3.5.1 - installed using the Qt
installer
Boost 1.59.0 – installed through Homebrew
Am able to compile and run Qt apps
After creating a new Qt test application, when I add the Boost information to the .pro file (shown below) as described in the question linked above, I end up with very confusing compile errors within the Qt classes. I don't get it. Does anyone understand the conflict and know how to resolve this – I've been at it for hours now.
QT += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = audiowaveform_test
TEMPLATE = app
SOURCES += main.cpp\
mainwindow.cpp
HEADERS += mainwindow.h
FORMS += mainwindow.ui
macx {
QMAKE_CXXFLAGS += -std=c++11
_BOOST_PATH = /usr/local/Cellar/boost/1.59.0
INCLUDEPATH += "$${_BOOST_PATH}/include/"
LIBS += -L$${_BOOST_PATH}/lib
## Use only one of these:
LIBS += -lboost_chrono-mt -lboost_system # using dynamic lib (not sure if you need that "-mt" at the end or not)
#LIBS += $${_BOOST_PATH}/lib/libboost_chrono-mt.a # using static lib
}
I finally got it working by changing this line in the .pro file:
QMAKE_CXXFLAGS += -std=c++11
to this:
CONFIG += c++11
If someone can explain what -std means in compiler speak, I would appreciate it. Does it mean that everything should be compiled as c++11?
Related
I'm trying to cross compile Qt Quick Designer Components to get QtQuick.Studio.Effects module on Qt 6.5 on arm64 target as I'm getting "module 'QtQuick.Studio.Effects' is not installed" when I try to to run my cross compiled qt application.
So far I have cross compiled Qt Quick Designer Components with help of this and it outputs libQuickStudioEffects.a static library. I tried to link it in .Pro file by adding the library with qt creator which generated following lines.
unix:!macx: LIBS += -L/home/user/qt/ -lQuickStudioEffects
INCLUDEPATH += /home/user/qt/
DEPENDPATH += /home/user/qt/
unix:!macx: PRE_TARGETDEPS += /home/user/qt/libQuickStudioEffects.a
lib file and executable both are in /home/user/qt/ location in target and host pc.
also I tried with following line.
LIBS += /home/user/qt/libQuickStudioEffects.a
So far executable is not detecting the lib file and giving me the above mentioned error. I can run other cross compiled qt6 programs on my target device without any issue. My host runs Ubuntu 20 and target runs on debian 11. Any help is really appreciated. Thanks.
Build the dev branch from here and it will give the dynamic QtQuick.Studio.Effects library which can be cross compiled.
I work on Mac OS 10.8.5 and Qt 5.1.1 with among other things, qdebug class which work well with some projects and doesn't compile with some others. I've already tried to re-install Qt which didn't change a thing.
It is certainly due to the use of SDL library (?!) but it used to work fine. Here's a part of the compilation output :
In file included from ../../Stage/Joker/tests/SDLTest/main.cpp:7:
In file included from /Applications/QT/5.1.1/clang_64/include/QtCore/QDebug:1:
In file included from /Applications/QT/5.1.1/clang_64/include/QtCore/qdebug.h:46:
In file included from /Library/Frameworks/QtCore.framework/Headers/qhash.h:46:
/Library/Frameworks/QtCore.framework/Headers/qchar.h:76:5: error: unknown type name 'QT_ASCII_CAST_WARN_CONSTRUCTOR'
QT_ASCII_CAST_WARN_CONSTRUCTOR QChar(char c);
^
If needed, I can provide more output or unworking Qt classes.
I build my code with Qt => Build => Run
Unfortunatly, I'm unable to reproduce the code on an other computer.
Here's the pro file (which work well with all my co-workers, except me) :
TEMPLATE = app
SOURCES += main.cpp
OBJECTIVE_HEADERS += ../../libs/PhGraphic/SDLMain.h
OBJECTIVE_SOURCES += ../../libs/PhGraphic/SDLMain.m
LIBS += -framework Cocoa
QMAKE_CXXFLAGS += -F/Library/Frameworks
QMAKE_OBJECTIVE_CFLAGS += -F/Library/Frameworks
LIBS += -F/Library/Frameworks
LIBS += -framework SDL -framework SDL_image -framework SDL_ttf
I'd once had this problem after installing a software: it created a QtCore.framework in the /Library/Framework folder that overrided the QtCore of your current Qt kit (due to QMAKE_CXXFLAGS += -F/Library/Frameworks).
It's qDebug, and there are two overloads:
a stream-returning function
qDebug() << "foo";
a printf-style function
qDebug("foo");
You need to provide a minimum reproducible test case for us to help you.
How are you building your code? Are you using qmake to produce the Makefile? We'd need to see the .pro file at the minimum, and please minimize it by removing useless boilerplate comments etc.
A problem with a Qt *.pro file:
TARGET = ProgName
TEMPLATE = app
CONFIG += console
QT += core
QT += gui
LIBS += -LC:\\Qt\\4.8.5\\bin
LIBS += -LC:\\Qt\\4.8.5\\lib
LIBS += -LS:\\lib
# LIBS += -lQtCored4 # not necessary
# LIBS += -lQtCore4
# LIBS += -lQtGuid4
# LIBS += -lQtGui4
SOURCES += ...
HEADERS += ...
I get these linker errors:
:-1: error: cannot find -lQtGuid
:-1: error: cannot find -lQtCored
collect2.exe:-1: error: error: ld returned 1 exit status
All the DLLs exist in the specified directories.
The documentation did not help much.
This pro file worked a few days ago, and it seems to have issues since I installed Qt 5.1 (this is not used, yet; I am still working with Qt4).
Platform: Windows 7, MinGW, Qt 4.8.4
You only need the following content:
TARGET = ProgName
TEMPLATE = app
CONFIG += console
QT -= gui
SOURCES += ...
HEADERS += ...
That is because core and gui are added to the QT variable automatically. In this particular case however, you can remove the gui default if you wish to build a console application as you seem. Although "CONFIG += console" could eventually do that for you. Besides this, everything will work automatically for you, so you do not need to pass the library path to the qt libraries and so forth. You would only need to use QT += widgets and similar lines if you used further Qt modules there are not there by default. Even then, you would not need to set the Qt library path as you did in your question.
Besides, if you wanna target cross-platform later, you may wish to add this:
CONFIG -= app_bundle
to avoid creating Mac bundle for console based applications.
If you have multiple versions of Qt installed as it seems, you need to use the qmake from the required version, and it will be fine. Just to give an example: I use qmake for Qt 5 on my Archlinux system, and qmake-qt4 for Qt4.
On windows, you should either have the desired qt installation bin in the path before the undesired, or you need to call desired qmake explicitly, something like C:\path\to\my\desired\qmake.
There's no need to link to any Qt libraries afaik.
If you're using Qt Creator you need to make sure Qt 4.8.4 is properly recognized in Tools - Options - Build & Run - Kits. Since you installed 5.1 this may no longer be true. Then set the 4.8.4 kit for your project and compile it (cleaning the build directory also helps sometimes).
This one is tough ! Please don't mistake this for a newbie question ;) I have far too many miles in this OpenCV + MinGW static stuff for the simple mistakes....
Environment:
a. Qt 5.0.1 built with MinGW (the standard opensource download from qt-project) - so everything is built with the same MinGW environment.
b. Using CMake I setup minimal build (using the same g++/gcc as Qt) and turned OFF SHARED_LIBRARIES.
c. generated the cmake + mingw32-make + mingw32-make install works fine.
up till here everything looks pretty smooth ...
Now when I added:
win32-g++:INCLUDEPATH += D:/Dev/opencv/build/install/include
win32-g++:LIBS += -LD:/Dev/opencv/build/install/lib
win32-g++:LIBS += -static
win32-g++:LIBS += -llibopencv_core243d
win32-g++:LIBS += -llibopencv_imgproc243d
win32-g++:LIBS += -llibopencv_highgui243d
(and also without the "win32-g++" addition..)
I get d:/dev/qt/qt5.0.1/tools/mingw/bin/../lib/gcc/i686-w64-mingw32/4.7.2/../../../../i686-w64-mingw32/bin/ld.exe: cannot find -llibopencv_highgui243d
...
...
now.. I do have libopencv_highgui243d.a in the right directory, but the ld.exe linker is ignoring anything else than a lib ! which supposed to be a MS library (which I wanted to avoid in the first place!!!) - I even tried to rename the .a files to .lib which caused the linker to regard the files, but show many "unreferenced" errors...
So who's to blame? the linker? CMake? mingw? Qt? ....
I tried many command line / flag options but without success ..
You should be referring to the libraries as:
LIBS += -lopencv_core243d
LIBS += -lopencv_imgproc243d
LIBS += -lopencv_highgui243d
Since -l already inserts lib at the beginning of the name.
While building a game code in Qt simulator I'm getting the following error:
-1: error: LNK1104: cannot open file 'libEGL.lib'
I have added following code to add library files:
INCLUDEPATH +=
C:\Imagination_Technologies\POWERVR_SDK\OGLES2_WINDOWS_X86EMULATION_2.08.28.0634\Builds\OGLES2\Include\
LIBS +=
-LC:\Imagination_Technologies\POWERVR_SDK\OGLES2_WINDOWS_X86EMULATION_2.08.28.0634\Builds\OGLES2\WindowsX86\Lib\
-llibEGL -llibGLESv2
LIBS += -llibEGL -llibGLESv2
It's been some time since I stopped programming under Windows, but as far as I can remember qmake uses the same mechanism used in Linux on all the supported OS (http://doc.qt.io/qt-5/qmake-project-files.html). Which means you should write:
LIBS += -LC:\Imagination_Technologies\POWERVR_SDK\OGLES2_WINDOWS_X86EMULATION_2.08.28.0634\Builds\OGLES2\WindowsX86\Lib\ -lEGL -lGLESv2
provided the path is correct of course (note that I removed the 'lib').