Custom library problem

[Dario]

Hello,

first of all, my aplogies for posting this again. I've researched the forum and I've found plenty of old posts similar to this one. The thing is, all of them were solved by modifying the .pro file, which has not worked for me (I think my pro file is ok). Instead of resurrecting a dead post I created a new one.

The problem is the inclusion of a library I made myself, called libCCCI.so into Qt4. I use eclipse Helios on a Ubuntu 10.04. The library libCCCI.so is in a folder called libs within my eclipse project.

My .pro file looks like this:
TEMPLATE = app
TARGET = EPSI
QT += core gui
HEADERS += epsi.h
SOURCES += main.cpp \
epsi.cpp
FORMS += epsi.ui
RESOURCES +=
INCLUDEPATH += ./libs
LIBS += -lCCCI

(I proved all set of combinations in the LIBS parameter, -Lfull path -l library, -Lrelative path -l library etc, but only got replicated -l entries in the g++ line and no solution)

The resultant g++ call is:
g++ -c -pipe -g -Wall -W -D_REENTRANT -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/share/qt4/mkspecs/linux-g++ -I. -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtGui -I/usr/include/qt4 -Ilibs -Idebug -I. -o debug/main.o main.cpp

So the directory is included (-Ilibs) but for some reason Qt4 does not see it. I also copied the library to the root of the project since it is also included (-I.) to see if it saw it there. It did not.

I also added the library in the project->properties->C/C++ project paths->Libraries
And the "libs" path in project->properties->C/C++ include paths and symbols

I run make clean, qmake, make and it gives the next errors:
For the include of header files from the library: No such file or directory
For the objects of the library: Does not name a type.

If I run the project regardless of the errors, I get the following message:
error while loading shared libraries: libCCCI.so: cannot open shared object file: no such file or directory
This is what makes me angry. It knows it is there. Somewhere. But it does not see it.

Thanks to anyone who even bother reading this. I've already lost 4 days of work with this issue and I'm starting to get desperate (and so is my boss). If anyone could at least tell me if there is a problem with my pro file, that would be great.

[stampede]

For the include of header files from the library: No such file or directory

Where is this header located ? In the "libs" directory ?
If you want to use shared library in C app, you'll need header as well, not only .so file.

Try to:
0) fix the include .h error, this one has nothing to do with the fact that you are using .so file
1) modify LD_LIBRARY_PATH to contain directory with .so library
2) if it fails try to load it dynamically ( with dlopen("/path/to/lib.so") ) and eventually check error ( dlerror() )

-----
edit:
now I saw this

INCLUDEPATH += ./libs

is this just a typo in your post ? or you have this line in .pro file ?
Did you mean

INCLUDEPATH += . libs

?