Include .so library into another in Qt

Question

I try to include one dynamic library(.so) into another. Than I include first library into app. TDS-Converter/Converter it's directory with source code. With this config I get error when try to call any function of second library via undefined reference to.

QT -= gui
TEMPLATE = lib

unix {
    DEPENDPATH += . ../../TDS-Converter/Converter
    INCLUDEPATH +=  ../../TDS-Converter/Converter
    LIBS += ../../TDS-Converter/Converter/Converter -lConverter
}
win32 {
}

SOURCES += main.cpp\
   ...

HEADERS += \ 
    ...

How to fix this ?

score 0 · Answer 1 · edited May 23 '17 at 12:20

Your LIBS seems wrong, it should probably be

LIBS += -L../../TDS-Converter/Converter/Converter -lConverter

...and double-check the file really is this, and fix if not:

../../TDS-Converter/Converter/Converter/libConverter.so

If you're talking about runtime, then read on:

The other library is not "inluded" in your library, it is used by your library. So it needs to be available at runtime. A quick fix, set LD_LIBRARY_PATH environment variable to the ../../TDS-Converter/Converter/Converter directory, when running an application which uses your library.

Alternatives to LD_LIBRARY_PATH environment variable are

use rpath, which puts the preferred library search path into the executable. Downside is, this needs to be decided at compile time.
Copy libConverter.so to some current system include directory, and run ldconfig to refresh library cache. Downside is, you need root and clutter system library directories.
Add the directory where libConvereter.so is to /etc/ld.so.conf (or preferably to a new file under /etc/ld.so.conf.d), and run ldconfig to refresh library cache. Downside is, you need root, and clutter system configuration.

Include .so library into another in Qt

1 Answers1