"Cannot find -lqjpeg" error when compiling QT application in static mode

[JonathanReez]

hello, everyone!

I am trying to compile a QT application in static (release configuration) mode using Nokia's QT Creator v.4.7.0 under Windows 7. I compiled QT itself statically as per standard instructions here. However, despite running configure.exe with -qt-libjpeg I am still getting the following error:

mingw32/bin/ld.exe: cannot find -lqjpeg
collect2: ld returned 1 exit status

mingw32/bin/ld.exe: cannot find -lqjpeg
collect2: ld returned 1 exit status

To copy to clipboard, switch view to plain text mode 

.pro file does contain QTPLUGIN += qjpeg

.cpp file does contain Q_IMPORT_PLUGIN(qjpeg)

The project I am trying to compile is called CutyCapt and can be downloaded here.

[high_flyer]

However, despite running configure.exe with -qt-libjpeg I am still getting the following error:

Did you look if the build process actually succeed in building qt-libjpeg as well?
Does lib actually exists?

[JonathanReez]

qjpegd4.dll was successfully compiled in the plugins/imageformats directory. Should there be anything else? If so, how do I selectively compile only the plugins themselves (to avoid waiting for 3 hours for QT to recompile)?

I apologize if my question is stupid...

[high_flyer]

mingw32/bin/ld.exe: cannot find -lqjpeg

qjpegd4.dll was successfully compiled in the plugins/imageformats directory.

From what you have posted so far, it looks more like you are building a in release mode (you project) but linking to a debug Qt.
Do you have a release Qt build as well?
You can try changing your project built to debug and see if it helps.

[JonathanReez]

I have qjpeg.dll as well, so that's not the problem.

It seems that I lack qjpeg.a, not qjpeg.dll. However, no matter what parameters I pass to configure.exe, I can't get mingw32 to compile the imageformats libraries for static projects. I only get qjpeg4.a, which is the static version of the library. Any suggestions?

Perhaps someone could zip his c:/qt/static/plugins/imageformats folder and upload it? This seems like the easiest solution.

Thanks.

[high_flyer]

I am trying to compile a QT application in static

Ok, I missed it when I first read your post...

I can't get mingw32 to compile the imageformats libraries for static projects. I only get qjpeg4.a, which is the static version of the library.

I don't get it...
qjpeg4.a is as you say the static lib, and the static lib is what you want... so I am confused with the problem you have.
What is it then that you are looking for?

[JonathanReez]

I managed to finally compile the static version of the qjpeg library (libqjpeg.a) by removing the -qt-libjpeg parameter when executing configure.exe. It seems that by setting that parameter, you are telling Mingw32 to take the existing dynamic lib (?).

Now I only need to figure out how to do the same with qlibtiff and qlibgif.

>qjpeg4.a is as you say the static lib

As far as I understand qjpeg4 is a dynamic lib, as it contains the version number and takes only several kilobytes. qjpeg.a is the static lib.

I apologize if I'm not clear, I'm new to advanced QT compilation.

[high_flyer]

As far as I understand qjpeg4 is a dynamic lib, as it contains the version number and takes only several kilobytes. qjpeg.a is the static lib.

Actually no.
*.so or *.dll are dynamic.
*.a or *.lib are static (respectively).