[Solved] Qwt Build (static) success. Now a linking problem.

vezprog

I have built the Qwt libraries statically successfully and I have the static libraries in a sub folder lib in my build folder (and in my project folder). there is 4 files in the lib folder, qwt.lib (3700kb), qwtd.lib (9200kb), qwtmathml.lib (1200kb), and qwtmathmld.lib (966kb)

I am unable to add a QwtPlot to my project even with the libraries linked... heres my .pro include

@

qwt plot library

win32 { # windows
CONFIG(debug, debug|release) {
LIBS += -Llib\qwtd
}
else {
LIBS += -Llib\qwt
}
}
unix { # linux
LIBS += -L/usr/local/lib -lqwt-qt4
LIBS += -L/usr/local/lib -lQtSvg
}
@

I try to include a QwtPlot in my project and it does not recognize the object...

Any help on this matter? I feel like there is something simple wrong and its on the tip of my nose...

VanDerSam

You must add qwt include directory to INCLUDEPATH. For example,
@INCLUDEPATH += /usr/include/qwt/@

vezprog

Are we talking about an includepath to the library folder? or to the Qwt source code folder?

I am a bit confused since I thought the purpose of the static libraries was to allow for no Qwt source code...

VanDerSam

The Qwt source code folder has include folder. Please use it.

vezprog

I am doing this in windows, not linux. When i downloaded qwt, my qwt-6.0.1 download folder has a folder structure of:

designer/
doc/
examples/
lib/
src/
textengines/

the src folder does not have an "include" folder.

when I built the library statically, it added files to the lib folder in the download folder containing the static.lib files. I have moved the source code to C:/Qt/Qwt/src folder.

I have tried to make an include path in my .pro file linking to the that folder and am getting a ton of linking errors, which leads me to think that its not picking up the libraries correctly.

Heres my new .pro (one line code change)
@

library include path

INCLUDEPATH += lib
INCLUDEPATH += C:/Qt/Qwt/src

qwt plot library

win32 { # windows
CONFIG(debug, debug|release) {
LIBS += -Llib\qwtd
}
else {
LIBS += -Llib\qwt
}
}
unix { # linux
LIBS += -L/usr/local/lib -lqwt-qt4
LIBS += -L/usr/local/lib -lQtSvg
}
@

VanDerSam

LIBS += -Llib\qwtd is not correct. You must specify the full path to the libraries. For example, -LC:/Qt/Qwt/lib/qwtd.
Are you using MSVC complier?

vezprog

I am using the MSVC 2008 compiler.

So if this works, this brings me to my next question. When I go to deploy this on another computer that does not have Qwt in that folder, how does the application know where to link the .lib?

VanDerSam

You are using static linking Qwt library. So your executable file contains the library itself. It doesn't need external Qwt library.

vezprog

I apologize for the confusion, what I am trying to do is make is so I have the libraries my application folder and my application calls into the libraries instead of having them built into my executable. Which I though I was doing by including the library path.