I'm a big fan of StackOverflow because you always have answers for problems, and now is my chance to get advance of it Ö!
I'm trying to use a library which I got in the Internet, its OZCollide. Its suppossed to be crossplatform as it says in its website "Cross-platform, works on Windows, Linux and Macintosh, in fact any platform supporting VisualStudio 6/7 or gcc"
I got all the .h and .cpp, compile them with MinGW as objects (.o) and then link them all using ar. But the problem is when I include and use the library on my project (QT & MinGW) it throws "undefined reference".
I thought the problem could be that library examples only uses Visual Studio, so the library coulnd't be compiled for MinGW, but the website tells other story.
Thanks for your time!
EDIT: Okay I have managed to compile it and use it moving to another computer and compiling makefile. The only one difference is that Computer A had Cygwing and MinGW installed (with Cygwin set up in Windows path) and Computer B only had MinGW.
So I guess the problem was Makefile calling for g++ and Cygwin g++ got called instead of MinGW g++??
If I'm right, whats the difference between Cygwin and MinGW?
if you have experience with CMake, create your own CMakeLists file and import/link this libraries against your project. In this way, you can create projects for MinGW/MSVC/Linux/etc.
Here you'll find a good start with CMake http://www.cmake.org/cmake-tutorial/
Related
I'm on Manjaro based on Arch Linux.
I searched everywhere, and I cannot seem to find that binary file.
Searched /usr/lib/qt, used find and which commands, etc.
The only might-be relevant thing I found is in /usr/lib/qt6/bin/, I found a binary file called "qt-cmake". But I'm pretty sure that's not what I'm looking for.
My final goal is to install the latest release version of Qt Creator on GitHub, and installation needs to know the paths of two binary files :
Qt
Llfw
Installation guide precisely says "These instructions assume that Ninja is installed and in the PATH, Qt Creator sources are located at /path/to/qtcreator_sources, Qt is installed in /path/to/Qt, and LLVM is installed in /path/to/llvm."
There is no "Qt binary file" per se. Qt is a framework, delivered as a (large) group of libraries and header files.
The Qt installer should provide you with everything you need. I'm not sure this link will work for you, but...
Qt Installer
As an aside, Qt Creator is an IDE for building and testing Qt-based applications. It isn't clear to me why you'd need the sources for that.
I'm trying to replicate an application that we currently have running on a physical Ubuntu server using an Ubuntu machine in Virtual Box. It is a QT application but on the server we are running it using pm2 from NPM. After installing QT, and installing drivers needed for the application i've tried to run it but keep coming across this error:
Cannot mix incompatible Qt library (version 0x50701) with this library (version 0x50905)
I've inherited the code from someone else and don't want to change the project to QT5.9.5, so i'm trying to run with 5.7.1, I've followed instructions on other questions in order to change the QT version to 5.7.1 but still get the same error when running it.
I followed the instructions here:
https://unix.stackexchange.com/questions/116254/how-do-i-change-which-version-of-qt-is-used-for-qmake
When checking the QT version using "qmake -v" in the console I get the following output:
QMake version 3.0 Using Qt version 5.7.1 in /home/sam/Qt5.7.1/5.7/gcc_64/lib
So although it looks to me like i'm using the desired version of Qt (5.7.1), i'm still getting the incompatible library issue, i'm very new to all of this so apologies if this is a stupid question. If anyone could tell me what to do in order to use the compatible library that'd be great, thanks.
I will try to explain this in steps!
Each complete set of Qt libraries is called a Qt "distribution". You can get Qt distributions from a variety of sources:
Installed from the package manager of your OS (.deb/.rpm).
From a downloaded zip file on http://qt.io
As a cloned repo from git
etc..
Some of the available Qt distributions will come pre-built, and some will need to be built from sources. In either case they will all have a qmake program that is specific to that particular Qt distribution. This program is responsible for building programs so that they link to the particular Qt distribution that the qmake is part of. qmake is also used when building with QtCreator.
If you have a binary built with one qmake and you try to run it on another computer, it might find the wrong Qt libraries during dynamic linking and spit out errors of "incompatible version of Qt".
There are many solutions to this problem;
Collect all the Qt libraries (Mine are in /home/myusername/Qt/5.version/gcc_64/lib/*.so) in the same folder as your program executable. This will make sure they are prefered to any other version of Qt that may be in your dynamic linker's path.
Uninstall the OS supplied Qt version(s). This may not be advisable especially if other programs use them.
Rebuilt your program from source using the correct qmake.
So I thought upgrading Qt and Qt Creator was a good idea since I used an older version of both.
I re-installed everything as I should and realized that Qt 5 is only for VS2010 for Windows which I have never worked with since I have been sticking with minGW up to this point,
I then realized my problems that my project wouldn't compile and run so I tried to download the 4.8.4 version with minGW, but that complained that:
"The installer could not find a valid c:\MinGW32\include\w32api.h
(Only versions with W32API3.13 are supported)"
and further I did not get creator when I installed it either.
Any help that would either let me go back to 4.8.8 minGW or a simple straight forward way using Qt creator with VS2010 would be appreciated, thanks.
I think I solved parts of my own issue (at least enough to answer this problem).
1: Download and install latest minGW installer and add ';C:\MinGW\bin' to the system variable 'path'.
2: Download the Qt 4.8.4 and install it (Does not come with Qt Creator) and add'C:\Qt\4.8.4\bin' to the system variable 'path'.
3: Download the latest Qt Creator, launch it and go:
tools -> options -> build & run
From there choose the correct Qt version by pointing to the Qmake in the Bin folder (C:\Qt\4.8.4\bin in this case)
Also make sure it auto detects minGW compiler, if it does not show up I am not sure what to do.
4: If you are including a project from other Qt versions you might have to delete the users.pro file (not the .pro file) to get it to compile properly.
Last issue is that I do not have any debugger, but the program compiles in the /release folder (if you put CONFIG += release in the pro file) and I can run it by using the .exe.
Using MSVS 2010 as the compiler isn't too hard.
Download Visual Studio Express 2010.
Install it, and now you have MSVS 2010 compiler available.
The compiler should be located under C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\bin or somewhere similar at cl.exe.
Setting up the latest version of Qt built against MSVC 2010, with the latest Qt Creator isn't too bad, either. In Tools > Options > Build and Run > Kits, find your Qt qmake installation, and in Tools > Options > Build and Run > Compiler, find your compiler.
Now you can use the amazing Qt 5 instead of sticking in the past with 4.8 (even though Qt 4.8 is awesome and works really well, too).
Hope that helps.
I just updated my Qt to 4.8.3, because the program built from older version is not compatible to the new framework.
So I have to upgrade.
This process was frustrating and time consuming. So many problems came out.
I download Qt from this url:
http://qt-project.org/downloads
At beginning, I installed the MinGW one (I'm not a fan of MSVC).
I tried the newest ( I think it's 4.6) version of MinGW and order version (4.4).
However, after I installed MinGW and tried to install Qt 4.8.3, during the process, the following message shows up:
There is a problem with your MinGW installation:
The installer could not find a valid C:\MinGW\include\w32api.h (Only versions with W32API 3.13 are supported)
Do you still want to continue? (Your installation may not work)
The 4.6 version does have this w32api.h file, I don't know what's going on. And I have trouble finding MinGW 4.4 with this head file.
I decide to ignore this warning and continue to install Qt and Qt creator. After that,
I opened my current project, configure it (why the configuration become so complex...), I tried to build it.
Then the following message shows up because some external lib I used requires Exception Handling:
exception handling disabled, use -fexceptions to enable
And I don't know how to enable the it.
I tried to add -fexceptions flag in QMAKE_CXXFLAGS but it doesn't work.
By the way, I tried the VC version of Qt too, but I used the MinGW before and the VC compiler is quite different, if I use VC version, it will take a lot of time to make it compilable by VC compiler.
Does anyone know how to install Qt 4.8.3 on Windows? my project works fine before, now I just want to compile it successfully.......
These are not the only problem.
I updated the Qt on Mac machine too, it is easier to have the compiler work since it's unix base.
However, I used QtWebkit lib in my project and obviously, they changed this lib and it's not compatible to order version.
I can compile my project on Mac, however, every time I run it, following massage shows up and the program stopped.
dyld: Symbol not found: _OBJC_CLASS_$_CALayerHost Referenced from:
/Library/Frameworks/QtWebKit.framework/Versions/4/QtWebKit Expected
in:
/System/Library/Frameworks/QuartzCore.framework/Versions/A/QuartzCore
The program has unexpectedly finished.
Does any one know how to solve this QtWebKit problem? I'll really appreciate.
I remembered that when Qt is under nokia, it's so easy to install and use, the Qt SDK is perfect.
I really hate the change made after it was bought by digia.........
I found solutions of my first two problems:
for the first problem, as I described, download the MinGW provided by Nokia Qt
ftp.qt.nokia.com/misc/MinGW-gcc440_1.zip [ftp.qt.nokia.com]
Tried several versions of MinGW 4.4, I think this is the only one works.
About the second problem, add following configure in the project file:
CONFIG += exceptions
Now the QWebKit problem is only one unsolved.
Is it all relevant that your include directory for MinGW has two "i's" in it or was that a typographic error when posted on SO? See:
The installer could not find a valid C:\MinGW\iinclude\w32api.h
I downloaded C++ libJSON from this link:
And they suggest me to use it as a library. How can I create library using the code they have provided?
you must have installed g++ and make in console/terminal just compile it type make, it will produce libjson.a which is static libary. When you create you C/C++ program you can link it with it g++ -l libjson.a
and in your code include libJSON.h header file.
#include "libJSON.h"
and you can use all functions from that header file.
On windows you must Install MinGW (GNU utilities for Windows), or IDE like DevC++ or Code::Blocks (Code::Blocks use MinGW). You can also use Cygwin unix like environment for windows (but when you compile file in cygwin you can run it only in Cygwin)
In Code::Blocks when you create project you can set additinal library which will be linked with your executable.
i was trying to compile libjson 7.6.1 for Visual Studio 2010. And was facing some difficulties in compiling it. What i did was
Download Libjson
open libjson.vcproj and goto line 240. You will find a missing ">". Type it in and save the file.
Now this can be used to build dynamic and static lib.
A simple thing wasted my couple of hours. Hope it saves some of yours.
This solution also works for more recent versions of Visual studio (e.g. 2015) which otherwise fail to complete the conversion to the mare recent project format.