[ROOT] Linking problem with private Class

From: Daniel Cussol (cussol@in2p3.fr)
Date: Tue Oct 24 2000 - 11:51:31 MEST 

Hello everybody,
 I am a newcomer in Root system. I am running the 2.25 version on a unix
Alpha OSF1 using cxx. I tried to implement in Root a personal
Class THEvsN dervied from TH2F. 

// 
// Declaration des spectres E*/N vs N
//

#include "Rtypes.h"
#include "TH2.h"

class THEvsN:public TH2F
	{
	public:
		int	np,nc;
		float	Edisp;	

	THEvsN(void);
	THEvsN(TH2F *spec);
	~THEvsN(void);
	
	virtual void Draw(Option_t *option);
	
	ClassDef(THEvsN,1)

	
	};
=============================================================================
// 
// Implementation des spectres E*/N vs N
//
#include <iostream.h>
#include <stdio.h>
#include <math.h>
#include "TGraph.h"
#include "THEvsN.h"

ClassImp(THEvsN)


THEvsN::THEvsN(void):TH2F()
	{
	np=0;
	nc=0;
	Edisp=0.;
	}
	
THEvsN::THEvsN(TH2F *spec):TH2F(*spec)
	{
	char	titre[80];
	sprintf(titre,"%s (THEvsN)\0",spec->GetName());
	SetName(titre);
	cout << "L'histogramme "<< this->GetName() << " de type THEvsN a ete cree." << endl;
	}

THEvsN::~THEvsN(void)
	{
	}
	
void THEvsN::Draw(Option_t *option)
	{
	TGraph	*graph=new TGraph();
	int	i;
	int     nbe=100;
        float epl[100];
        float am[100];
        float em[100];
        float esa[100];
        float eplb[100];
        float rm[100];
        float qm[100];

	FILE *fstatic=fopen("/home/grpun/cussol/n_corps/statique/statique_1_100.data","r");

	printf("fstatic=%d\n",fstatic); 

	for (i=0;i<nbe;i++)
 		{
		fscanf(fstatic,"%f %f %f %f %f %f\n",&am[i],&rm[i],&esa[i],&eplb[i],&rm[i],&qm[i]);
		}
	fclose(fstatic);

	cout << nbe << " valeurs dans les tableaux..." << endl;
	TH2F::Draw(option);
	for (i=0;i<nbe;i++)
		epl[i]=-esa[i];
	graph->SetLineColor(4);
	graph->DrawGraph(nbe,am,epl,"l");
	for (i=0;i<nbe;i++)
		epl[i]=-eplb[i];
	graph->SetLineColor(6);
	graph->DrawGraph(nbe,am,epl,"l");
	}
	



I have read the .html pages related to
that subject. So I use the following Makefile:
#---------------------------------------------------
CXXFLAGS      = -g  -z -I${ROOTSYS}/include
LDFLAGS       = -g  -z -shared -L${ROOTSYS}/lib/ -rpath ${ROOTSYS}/lib/
LD            = ld 

COMPIL	      = cxx

LIBS          = ${ROOTSYS}/lib/*.so -lXpm -lX11 -lm -lcxx -lc   

HDRS          = THEvsN.h

SRCS          = main_root.C THEvsN.C mydict.C

OBJS          = main_root.o THEvsN.o mydict.o

PROGRAM       = monroot

all:            ${PROGRAM}

${PROGRAM}:	${OBJS}
		@echo "Linking ${PROGRAM} ..."
		@${LD} ${LDFLAGS} ${OBJS} ${LIBS} -o ${PROGRAM}
		@chmod +x ${PROGRAM}
		@echo "done"

clean:;		@rm -f ${OBJS} core

###
THEvsN.o: THEvsN.h THEvsN.C
		@echo "Compilation de THEvsN.C"
		@$(COMPIL) -c ${CXXFLAGS} THEvsN.C 

main_root.o: THEvsN.h main_root.C
		@echo "Compilation de main_root.C"
		@$(COMPIL) -c ${CXXFLAGS} main_root.C

mydict.o:  mydict.C
		@echo "Compilation de mydict.C"
		@$(COMPIL) -c ${CXXFLAGS} mydict.C

mydict.C: THEvsN.h
		@echo "Generating dictionary ..."
		@rootcint mydict.C -c THEvsN.h
#---------------------------------------------------



The compilation and the linking are OK. But when I run
my executable file "monroot", the following error occurs:

346626:monroot: /sbin/loader: Error: Unresolved symbol in
/usr/shlib//libc.so: _end
346626:monroot: /sbin/loader: Fatal Error: this executable has
unresolvable symbols

I suspect an error in load flags definitions or in the copiler flag
definitions, but I can not find it. Did somebody had this problem? Could
somebody help me?

 Thanks in advance
 Friendly

Daniel CUSSOL

LPC Caen
Boulevard du Marechal Juin
14050 CAEN CEDEX

e-mail : cussol@in2p3.fr
Tel    : +33-(0)2-31-45-29-73
FAX    : +33-(0)2-31-45-25-49

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