Problems to compile a static library project

  • Hi all,
    I am new on this forum, and don't know if the post is at the good place. Let me know if i am wrong writing in this section.

    Today, i want to compile a static library with Qt. I started with a light sample code. I have a single class containing a QString attribute.
    When i compile this little project, i get a single error :
    QString : no such file or directory

    I really don't know why this error happened. I also trie to add QT += core to the .pro file with no more result.

    Here is the sample code :
    #include <QString>
    class SampleLibrary
    QString s;
    #include "SampleLibrary.h"

    And the .pro file :
    QT -= gui
    TARGET = SampleLibrary
    TEMPLATE = lib
    CONFIG = staticlib
    SOURCES += SampleLibrary.cpp
    HEADERS += SampleLibrary.h

    Someone here could help to resolve it ?

  • Remove
    #include <QString>

    bq. add QT += core to the .pro

  • Lifetime Qt Champion

    Hi and welcome to devnet,

    [quote author="MarianMMX" date="1384286077"]Remove
    #include <QString>

    Why remove the include ? How would he be able to use QString in that case ?

    What OS. Qt version and IDE are you using ?

  • Hi, thanks for your replies. I am using ubuntu 13.04 and Qt4.8.5.

  • Lifetime Qt Champion

    And how do you build your library ?

  • Hi guys,
    Sorry, i am late to reply ...

    To build the library, i just created a C++ Library project with QtCreator (the last version avaible).
    I added the "CONFIG = staticlib" to the project file to specify i want to build it as a static library (was configured to build a dynamic one into .so files).

    The library provides many classes to support the xPL protocol (see fore more informations about xPL project).
    Face to the difficulties i encountered to build it, i sarted a "test project", that i linked you in the above messages.
    I tried to build it from QtCreator.

    I also tried to add
    QT += core
    to the project file, but it doesn't fix the problem.

    Thank you very much for your replies.
    Have a good evening ! :)

  • Hi again !

    I just found my error !
    I had to change :
    CONFIG = staticlib

    CONFIG += staticlib

    And it performs the build correctly ! :)
    Thanks for help

  • Lifetime Qt Champion

    Ok, I see what your problem was.

    CONFIG contains already a base set of values. Using = you emptied it thus removing qt from it so it would use it to build your library

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