Can't generate shared library on ubuntu and can't link statically to a static library

[sierdzio]

Hm, code looks good to be honest.

@Mohammedbie said in Can't generate shared library on ubuntu and can't link statically to a static library:

unix:!macx: LIBS += -L$$PWD/../build-StaticTest-Desktop_Qt_5_8_0_GCC_64bit-Debug/ -lStaticTest

Is there a .a in that folder? Perhaps you need to link specifically to .a and not use the general -l flag.

[Mohammedbie]

@sierdzio

tried adding the following line with the same result :

LIBS += /home/softlock/build-StaticTest-Desktop_Qt_5_8_0_GCC_64bit-Debug/libStaticTest.a

[sierdzio]

@Mohammedbie said in Can't generate shared library on ubuntu and can't link statically to a static library:

@sierdzio

tried adding the following line with the same result :

LIBS += /home/softlock/build-StaticTest-Desktop_Qt_5_8_0_GCC_64bit-Debug/libStaticTest.a

Sorry I should have been more specific. You can provide full path to -l flag:

LIBS += -l/home/softlock/build-StaticTest-Desktop_Qt_5_8_0_GCC_64bit-Debug/libStaticTest.a

Or, another option is to use the file name specifier:

unix:!macx: LIBS += -L$$PWD/../build-StaticTest-Desktop_Qt_5_8_0_GCC_64bit-Debug/ -l:libStaticTest.a

Still, I don't know if that'll work.

[Mohammedbie]

@sierdzio

Tried both with the same result too.

[Mohammedbie]

something I didn't mention as I didn't think it was related , I build the shared library with Qt static library which I built from sources .
Now when I try to build the shared library with the same version of Qt but dynamic it builds and generates .so file and the test application runs normally.
What might cause this ?

[sierdzio]

@Mohammedbie said in Can't generate shared library on ubuntu and can't link statically to a static library:

something I didn't mention as I didn't think it was related , I build the shared library with Qt static library which I built from sources .
Now when I try to build the shared library with the same version of Qt but dynamic it builds and generates .so file and the test application runs normally.
What might cause this ?

Hm, not sure but maybe your Qt config or mkspecs leak into definitions of your project when qmake is run.

Try adding this in your shared lib .pro file:

CONFIG -= staticlib
CONFIG += shared

[Mohammedbie]

Thank you very much .
This solved it.

[Mohammedbie]

@sierdzio sorry for bothering you but one last thing how to convert those lines to a cmake line ?

Thanks in advance

[sierdzio]

@Mohammedbie said in Can't generate shared library on ubuntu and can't link statically to a static library:

@sierdzio sorry for bothering you but one last thing how to convert those lines to a cmake line ?

Thanks in advance

No idea, I don't know cmake well enough.

[Mohammedbie]

Ok thanks.

[SGaist]

Hi,

You set that in the call to add_library.

[Mohammedbie]

@SGaist

Hi ,
what I understood from cmake documentation is that add_library() configure the current project as a library and don't add an external library what I used instead was target_link_libraries() and it did the job indeed.

[SGaist]

Ok, from you .pro file it looked like you were generating libraries.