Using Qt Headers on Static Library

maydin

I created a subdirs project. I have 2 subproject called "app" and "engine". engine is a static library, and i want to use it from my app. But I cannot include Qt libraries like "<QStack>" in engine.

It works if I include in app but not in my static library?

koahnig

@maydin

How did you create the .pro-file for the static library?

It should be similar to the .pro of your application. The main difference is sthat you are using a different template in there.
You need to declare also all Qt modules required as in your .pro for template app.

The subdirs template basically bundles a couple of .pro and allows to build at once. Therefore your .pro for teh static library has to be self-contained.

maydin

@koahnig

Edit: I realized wizard removes core from pro file. When i added core to Qt by using Qt += core it worked. Now i have different problems like unresolved references.

I created from Qt Creator inside. Right clicked to project, "New Subroject" and selected static library. I compared .pro files from other classic projects but couldn't find a huge different except template. I do not see any library that starts with Q if i want to include.
Here is my .pro file for static lib:

**QT       -= core gui**
TARGET = engine
TEMPLATE = lib
CONFIG += staticlib
CONFIG += c++11

DEFINES += QT_DEPRECATED_WARNINGS

SOURCES += \
        coreclass.cpp \

HEADERS += \
        coreclass.h \

unix {
    target.path = /usr/lib
    INSTALLS += target
}

SGaist

Hi,

@maydin said in Using Qt Headers on Static Library:

QT -= core gui

Since you remove core and gui, you won't be able to use any of Qt's classes provided by these module.