Error : undefined reference to `vtable for MyClass'

[joseph]

Can you post headerFooterOptions.h and headerFooterOptions.cpp?

please refer the begining of this thread...

[jpn]

And what about "qmake -v" output?

[croland]

If I'm barking up the wrong tree let me know.

Did or do you need to include "chemcanvas.h"?

[joseph]

And what about "qmake -v" output?

The output after using "qmake -v "

QMake version 2.01a
Using Qt version 4.2.3 in /usr/local/Trolltech/Qt-4.2.3/lib

QMake version 2.01a
Using Qt version 4.2.3 in /usr/local/Trolltech/Qt-4.2.3/lib

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While compiling my program I am getting the below warning....

headerFooterOptions.h:0: Warning: No relevant classes found. No output generated.

headerFooterOptions.h:0: Warning: No relevant classes found. No output generated.

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And the linker error occured....

generating ../source/linuxmoc/moc_headerFooterOptions.cpp (moc)
compiling moc_headerFooterOptions.cpp (g++)
headerFooterOptions.h:0: Warning: No relevant classes found. No output generated.
linking MyProject (g++)
/root/Desktop/headerFooterOptions.cpp:22: undefined reference to `vtable for HeaderFooterOptions'
../source/linuxobj/source/headerFooterOptions.o(.text+0xba):/root/Desktop/source/headerFooterOptions.cpp:22: undefined reference to `vtable for HeaderFooterOptions'
/root/Desktop/source/headerFooterOptions.cpp:22:undefined reference to `vtable for HeaderFooterOptions'
../source/linuxobj/headerFooterOptions.o(.text+0x1904):/root/Desktop/source/headerFooterOptions.cpp:22: undefined reference to `vtable for HeaderFooterOptions'
*** Exited with status: 2 ***

generating ../source/linuxmoc/moc_headerFooterOptions.cpp (moc)
compiling moc_headerFooterOptions.cpp (g++)
headerFooterOptions.h:0: Warning: No relevant classes found. No output generated.
linking MyProject (g++)
/root/Desktop/headerFooterOptions.cpp:22: undefined reference to `vtable for HeaderFooterOptions'
../source/linuxobj/source/headerFooterOptions.o(.text+0xba):/root/Desktop/source/headerFooterOptions.cpp:22: undefined reference to `vtable for HeaderFooterOptions'
/root/Desktop/source/headerFooterOptions.cpp:22:undefined reference to `vtable for HeaderFooterOptions'
../source/linuxobj/headerFooterOptions.o(.text+0x1904):/root/Desktop/source/headerFooterOptions.cpp:22: undefined reference to `vtable for HeaderFooterOptions'
*** Exited with status: 2 ***

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thanks.....

[high_flyer]

but you didn't respond to this:

Yes, but from your code, it looks like you are using the Qt3 support classes of Qt4 , but still using the old Qt3 headers in parallel.
If this is the case, no woder you have trouble.
You should use the Qt4's Qt3-support in a Qt4 project, and code, meaning, the headers need to be Qt4 headers, and linking also against Qt4.
It looks to me you are only linking against Qt4, use Qt4's Qt3-Support headers, and the old Qt3 headers - this wont wrok.

If what I wrote here is correct, your problem is mixing Qt3 and Qt4 - at least.
You might have also a problem with the tool chain, but you first need to use the correct libs with the correct code.

[jpn]

headerFooterOptions.h:0: Warning: No relevant classes found. No output generated.

headerFooterOptions.h:0: Warning: No relevant classes found. No output generated.

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I can't spot the reason, but for some reason moc does not like the class declaration in headerFooterOptions.h. The only fault I can spot is an extra "\" at the end of FORMS variable in the .pro file.

[high_flyer]

joseph: what happens if you run manually moc on headerFooterOptions.h?
Does it create a moc then, or does the error repeat ti self?

[croland]

Hey Joseph,

You have ChemCanvas in your constructor, do you need to include chemcanvas.h?