Linking graphviz libraries to C++ correctly - c++

Question

I am developping a program with QtCreator in which I use graphviz2.38.
I have done a minimale example to explain. Just consider this small code which transform a dot file in svg file:
#include <QCoreApplication>
#include <graphviz/gvc.h>
#include <graphviz/gvplugin.h>
#include <graphviz/cgraph.h>
#include <graphviz/cdt.h>
#include<iostream>
using namespace std;
void saveImageGV(){
GVC_t *gvc= gvContext();
extern gvplugin_library_t gvplugin_dot_layout_LTX_library;
gvAddLibrary(gvc, &gvplugin_dot_layout_LTX_library);
FILE *fp = fopen(("ancestry.dot"), "r");
Agraph_t *g = agread(fp,0);
gvLayout(gvc, g, "dot");
gvRender(gvc, g, "svg", fopen(("ancestry.svg"), "w"));
gvFreeLayout(gvc, g);
agclose(g);
(gvFreeContext(gvc));
return exit(0);
}
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
saveImageGV();
return a.exec();
}
The compilation options are the following:
QT += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets printsupport
SOURCES += \
main.cpp
QMAKE_LFLAGS += "-Wl,--rpath=lib/ "
QMAKE_LFLAGS += "-Wl,--dynamic-linker=lib/ld-linux-x86-64.so.2"
# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target
INCLUDEPATH += /usr/local/include/graphviz/
unix:!macx: LIBS += -L$$PWD/../../../../usr/lib/ -lcdt
INCLUDEPATH += $$PWD/../../../../usr/lib
DEPENDPATH += $$PWD/../../../../usr/lib
unix:!macx: LIBS += -L$$PWD/../../../../usr/lib/ -lcgraph
INCLUDEPATH += $$PWD/../../../../usr/lib
DEPENDPATH += $$PWD/../../../../usr/lib
unix:!macx: LIBS += -L$$PWD/../../../../usr/lib/ -lgvc
INCLUDEPATH += $$PWD/../../../../usr/lib
DEPENDPATH += $$PWD/../../../../usr/lib
unix:!macx: LIBS += -L$$PWD/../../../usr/lib/graphviz/ -lgvplugin_dot_layout
INCLUDEPATH += $$PWD/../../../usr/lib/graphviz
DEPENDPATH += $$PWD/../../../usr/lib/graphviz
unix:!macx: LIBS += -L$$PWD/../../../usr/lib/graphviz/ -lgvplugin_core
INCLUDEPATH += $$PWD/../../../usr/lib/graphviz
DEPENDPATH += $$PWD/../../../usr/lib/graphviz
unix:!macx: LIBS += -L$$PWD/../../../../usr/lib/ -lpathplan
INCLUDEPATH += $$PWD/../../../../usr/lib
DEPENDPATH += $$PWD/../../../../usr/lib
unix:!macx: LIBS += -L$$PWD/../../../../usr/lib/ -lxdot
INCLUDEPATH += $$PWD/../../../../usr/lib
DEPENDPATH += $$PWD/../../../../usr/lib
I also provide you an example of graphviz dot code if needed for ancestry.dot:
graph {
a -- b;
b -- c;
a -- c;
d -- c;
e -- c;
e -- a;
}
In my lib folder, I have the following libraries:
ld-linux-x86-64.so.2 libc.so.6 libgvplugin_dot_layout.so.6 libxdot.so.4
libcdt.so.5 libgvc.so.6 libgvplugin_gd.so.6
libcgraph.so.6 libgvplugin_core.so.6 libpathplan.so.4
To load these libraries at execution time, I use the following script:
#!/bin/sh
appname=`basename $0 | sed s,\.sh$,,`
dirname=`pwd`
lib=/lib/
chmod +x $dirname/$appname
LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$dirname$lib
echo $LD_LIBRARY_PATH
./$appname "$#"
When I execute my code, I get a segmentation fault ... Any idea of what is happening?