[Solved] Qwt Build (static) success. Now a linking problem.
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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...
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You must add qwt include directory to INCLUDEPATH. For example,
@INCLUDEPATH += /usr/include/qwt/@
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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...
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The Qwt source code folder has include folder. Please use it.
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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/srcqwt 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
}
@
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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?
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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?
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You are using static linking Qwt library. So your executable file contains the library itself. It doesn't need external Qwt library.
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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.
